diff --git a/Level0/Unknown.obj b/Level0/Unknown.obj
deleted file mode 100644
index d456ea9..0000000
--- a/Level0/Unknown.obj
+++ /dev/null
@@ -1,28 +0,0 @@
-# cerc-hub export
-# building UUID_d281adfc-4901-0f52-540b-4cc1a9325f82
-g UUID_d281adfc-4901-0f52-540b-4cc1a9325f82
-s off
-# surface 9a1623ed-cff3-46e3-b216-6b5bc34caf68
-v 0.0 5.0 6.517691453623996
-v 0.0 10.0 3.630940107675997
-v 0.0 10.0 0.0
-v 0.0 0.0 0.0
-v 0.0 0.0 3.630940107675997
-f  1 2 3 4 5 
-# surface 6ac94b17-cc97-4b67-b79a-402cd0325917
-v 12.0 0.0 3.630940107675997
-v 12.0 0.0 0.0
-f  6 5 4 7 
-# surface 429f5b6f-2818-4882-b8f4-f6983e707d86
-v 12.0 5.0 6.517691453623996
-v 12.0 10.0 0.0
-v 12.0 10.0 3.630940107675997
-f  8 6 7 9 10 
-# surface e934907a-d808-45bc-bc8f-5ad17b0834f1
-f  1 8 10 2 
-# surface 0e80bc1f-0b35-4917-ba25-98139457582c
-f  2 10 9 3 
-# surface d8ef7be5-3144-4947-b054-c9e39f548ad1
-f  6 8 1 5 
-# surface f30c3309-acc2-46a8-aa15-e255c345d77c
-f  7 4 3 9 
diff --git a/README.md b/README.md
index e395424..d62a14f 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,3 @@
 # Documentation
 
-This repository contains the CERC development documentation and it's intended to be linked from different repositories and sites
+This repository contains the CERC development documentation, and it's intended to be linked from different repositories and sites
diff --git a/Level/FZK-Haus-LoD2-KIT-IAI-KHH-B36-V1.gml b/support_material/tutorial_0/FZK-Haus-LoD2-KIT-IAI-KHH-B36-V1.gml
similarity index 98%
rename from Level/FZK-Haus-LoD2-KIT-IAI-KHH-B36-V1.gml
rename to support_material/tutorial_0/FZK-Haus-LoD2-KIT-IAI-KHH-B36-V1.gml
index baf0544..04c9be7 100644
--- a/Level/FZK-Haus-LoD2-KIT-IAI-KHH-B36-V1.gml
+++ b/support_material/tutorial_0/FZK-Haus-LoD2-KIT-IAI-KHH-B36-V1.gml
@@ -1,240 +1,240 @@
-<?xml version="1.0" encoding="utf-8"?><!-- IFC to CityGML by IFCExplorer KIT --><!-- CityGML to Sketchup by  Sketchup CityGML Plugin FH GelsenKirchen --><!--CityGML Dataset produced with CityGML Export Plugin for Sketchup by GeoRES --><!--http://www.geores.de --><!-- Edited Manually in Oxygen 8.2 --><!-- Modified by GMLOffset.xslt at Mon Dec 6 2010 --><!-- Version 2 Building located in the area of KIT Campus North)--><!-- Modified by GMLOffset.xslt at Wed Dec 8 2010 --><!-- Modified by GMLOffset.xslt at Wed Mar 29 2017 --><core:CityModel xsi:schemaLocation="http://www.opengis.net/citygml/2.0 http://schemas.opengis.net/citygml/2.0/cityGMLBase.xsd  http://www.opengis.net/citygml/appearance/2.0 http://schemas.opengis.net/citygml/appearance/2.0/appearance.xsd http://www.opengis.net/citygml/building/2.0 http://schemas.opengis.net/citygml/building/2.0/building.xsd http://www.opengis.net/citygml/generics/2.0 http://schemas.opengis.net/citygml/generics/2.0/generics.xsd" xmlns:core="http://www.opengis.net/citygml/2.0" xmlns="http://www.opengis.net/citygml/profiles/base/2.0" xmlns:bldg="http://www.opengis.net/citygml/building/2.0" xmlns:gen="http://www.opengis.net/citygml/generics/2.0" xmlns:grp="http://www.opengis.net/citygml/cityobjectgroup/2.0" xmlns:app="http://www.opengis.net/citygml/appearance/2.0" xmlns:gml="http://www.opengis.net/gml" xmlns:xAL="urn:oasis:names:tc:ciq:xsdschema:xAL:2.0" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
-    <!-- Manually edited by KHH 23.01.2017, CityGML 2.0, Address added, Codespaces added -->
-    <gml:name>AC14-FZK-Haus</gml:name>
-    <gml:boundedBy>
-        <gml:Envelope srsDimension="3" srsName="urn:adv:crs:ETRS89_UTM32*DE_DHHN92_NH">
-            <gml:lowerCorner srsDimension="3">457842 5439083 111.8 </gml:lowerCorner>
-            <gml:upperCorner srsDimension="3">457854 5439093 118.317669 </gml:upperCorner>
-        </gml:Envelope>
-    </gml:boundedBy> 
-    <core:cityObjectMember>
-        <bldg:Building gml:id="UUID_d281adfc-4901-0f52-540b-4cc1a9325f82">
-            <gml:description>FZK-Haus (Forschungszentrum Karlsruhe, now KIT), created by Karl-Heinz
-                Haefele </gml:description>
-            <gml:name>AC14-FZK-Haus</gml:name>
-            <core:creationDate>2017-01-23</core:creationDate>
-            <core:relativeToTerrain>entirelyAboveTerrain</core:relativeToTerrain>
-            <gen:measureAttribute name="GrossPlannedArea">
-                <gen:value uom="m2">120.00</gen:value>
-            </gen:measureAttribute>
-            <gen:stringAttribute name="ConstructionMethod">
-                <gen:value>New Building</gen:value>
-            </gen:stringAttribute>
-            <gen:stringAttribute name="IsLandmarked">
-                <gen:value>NO</gen:value>
-            </gen:stringAttribute>
-            <bldg:class codeSpace="http://www.sig3d.org/codelists/citygml/2.0/building/2.0/_AbstractBuilding_class.xml">1000</bldg:class>
-            <bldg:function codeSpace="http://www.sig3d.org/codelists/citygml/2.0/building/2.0/_AbstractBuilding_function.xml">1000</bldg:function>
-            <bldg:usage codeSpace="http://www.sig3d.org/codelists/citygml/2.0/building/2.0/_AbstractBuilding_usage.xml">1000</bldg:usage>
-            <bldg:yearOfConstruction>2020</bldg:yearOfConstruction>
-            <bldg:roofType codeSpace="http://www.sig3d.org/codelists/citygml/2.0/building/2.0/_AbstractBuilding_roofType.xml">1030</bldg:roofType>
-            <bldg:measuredHeight uom="m">6.52</bldg:measuredHeight>
-            <bldg:storeysAboveGround>2</bldg:storeysAboveGround>
-            <bldg:storeysBelowGround>0</bldg:storeysBelowGround>
-            <bldg:lod2Solid>
-                <gml:Solid>
-                    <gml:exterior>
-                        <gml:CompositeSurface>
-                            <!--Outer Wall 1 (West)  -->
-                            <gml:surfaceMember xlink:href="#PolyID7350_878_759628_120742"> </gml:surfaceMember>
-                            <!--Outer Wall 1 (West)  -->
-                            <!--Outer Wall 2 (South)  -->
-                            <gml:surfaceMember xlink:href="#PolyID7351_1722_416019_316876" />
-                            <!--Outer Wall 2 (South)  -->
-                            <!--Outer Wall 3 (East)  -->
-                            <gml:surfaceMember xlink:href="#PolyID7352_230_209861_355851" />
-                            <!--Outer Wall 3 (East)  -->
-                            <!--Roof 1 (North)  -->
-                            <gml:surfaceMember xlink:href="#PolyID7353_166_774155_320806" />
-                            <!--Roof 1 (North)  -->
-                            <!--Outer Wall 4 (North)  -->
-                            <gml:surfaceMember xlink:href="#PolyID7354_1362_450904_410226" />
-                            <!--Outer Wall 2 (North)  -->
-                            <!--Roof 2 (South)  -->
-                            <gml:surfaceMember xlink:href="#PolyID7355_537_416207_260034" />
-                            <!--Roof 2 (South)  -->
-                            <!--Base Surface  -->
-                            <gml:surfaceMember xlink:href="#PolyID7356_612_880782_415367" />
-                            <!--Base Surface  -->
-                        </gml:CompositeSurface>
-                    </gml:exterior>
-                </gml:Solid>
-            </bldg:lod2Solid>
-            <bldg:boundedBy>
-                <bldg:WallSurface gml:id="GML_5856d7ad-5e34-498a-817b-9544bfbb1475">
-                    <gml:name>Outer Wall 1 (West)</gml:name>
-                    <bldg:lod2MultiSurface>
-                        <gml:MultiSurface>
-                            <gml:surfaceMember>
-                                <gml:Polygon gml:id="PolyID7350_878_759628_120742">
-                                    <gml:exterior>
-                                        <gml:LinearRing gml:id="PolyID7350_878_759628_120742_0">
-                                            <gml:pos>457842 5439088 118.317691453624 </gml:pos>
-                                            <gml:pos>457842 5439093 115.430940107676 </gml:pos>
-                                            <gml:pos>457842 5439093 111.8 </gml:pos>
-                                            <gml:pos>457842 5439083 111.8 </gml:pos>
-                                            <gml:pos>457842 5439083 115.430940107676 </gml:pos>
-                                            <gml:pos>457842 5439088 118.317691453624 </gml:pos>
-                                        </gml:LinearRing>
-                                    </gml:exterior>
-                                </gml:Polygon>
-                            </gml:surfaceMember>
-                        </gml:MultiSurface>
-                    </bldg:lod2MultiSurface>
-                </bldg:WallSurface>
-            </bldg:boundedBy>
-            <bldg:boundedBy>
-                <bldg:WallSurface gml:id="GML_d38cf762-c29d-4491-88c9-bdc89e141978">
-                    <gml:name>Outer Wall 2 (South)</gml:name>
-                    <bldg:lod2MultiSurface>
-                        <gml:MultiSurface>
-                            <gml:surfaceMember>
-                                <gml:Polygon gml:id="PolyID7351_1722_416019_316876">
-                                    <gml:exterior>
-                                        <gml:LinearRing gml:id="PolyID7351_1722_416019_316876_0">
-                                            <gml:pos>457854 5439083 115.430940107676 </gml:pos>
-                                            <gml:pos>457842 5439083 115.430940107676 </gml:pos>
-                                            <gml:pos>457842 5439083 111.8 </gml:pos>
-                                            <gml:pos>457854 5439083 111.8 </gml:pos>
-                                            <gml:pos>457854 5439083 115.430940107676 </gml:pos>
-                                        </gml:LinearRing>
-                                    </gml:exterior>
-                                </gml:Polygon>
-                            </gml:surfaceMember>
-                        </gml:MultiSurface>
-                    </bldg:lod2MultiSurface>
-                </bldg:WallSurface>
-            </bldg:boundedBy>
-            <bldg:boundedBy>
-                <bldg:WallSurface gml:id="GML_8e5db638-e46a-4739-a98a-2fc2d39c9069">
-                    <gml:name>Outer Wall 3 (East)</gml:name>
-                    <bldg:lod2MultiSurface>
-                        <gml:MultiSurface>
-                            <gml:surfaceMember>
-                                <gml:Polygon gml:id="PolyID7352_230_209861_355851">
-                                    <gml:exterior>
-                                        <gml:LinearRing gml:id="PolyID7352_230_209861_355851_0">
-                                            <gml:pos>457854 5439088 118.317691453624 </gml:pos>
-                                            <gml:pos>457854 5439083 115.430940107676 </gml:pos>
-                                            <gml:pos>457854 5439083 111.8 </gml:pos>
-                                            <gml:pos>457854 5439093 111.8 </gml:pos>
-                                            <gml:pos>457854 5439093 115.430940107676 </gml:pos>
-                                            <gml:pos>457854 5439088 118.317691453624 </gml:pos>
-                                        </gml:LinearRing>
-                                    </gml:exterior>
-                                </gml:Polygon>
-                            </gml:surfaceMember>
-                        </gml:MultiSurface>
-                    </bldg:lod2MultiSurface>
-                </bldg:WallSurface>
-            </bldg:boundedBy>
-            <bldg:boundedBy>
-                <bldg:RoofSurface gml:id="GML_875d470b-32b4-4985-a4c8-0f02caa342a2">
-                    <gml:name>Roof 1 (North)</gml:name>
-                    <bldg:lod2MultiSurface>
-                        <gml:MultiSurface>
-                            <gml:surfaceMember>
-                                <gml:Polygon gml:id="PolyID7353_166_774155_320806">
-                                    <gml:exterior>
-                                        <gml:LinearRing gml:id="PolyID7353_166_774155_320806_0">
-                                            <gml:pos>457842 5439088 118.317691453624 </gml:pos>
-                                            <gml:pos>457854 5439088 118.317691453624 </gml:pos>
-                                            <gml:pos>457854 5439093 115.430940107676 </gml:pos>
-                                            <gml:pos>457842 5439093 115.430940107676 </gml:pos>
-                                            <gml:pos>457842 5439088 118.317691453624 </gml:pos>
-                                        </gml:LinearRing>
-                                    </gml:exterior>
-                                </gml:Polygon>
-                            </gml:surfaceMember>
-                        </gml:MultiSurface>
-                    </bldg:lod2MultiSurface>
-                </bldg:RoofSurface>
-            </bldg:boundedBy>
-            <bldg:boundedBy>
-                <bldg:WallSurface gml:id="GML_0f30f604-e70d-4dfe-ba35-853bc69609cc">
-                    <gml:name>Outer Wall 4 (North)</gml:name>
-                    <bldg:lod2MultiSurface>
-                        <gml:MultiSurface>
-                            <gml:surfaceMember>
-                                <gml:Polygon gml:id="PolyID7354_1362_450904_410226">
-                                    <gml:exterior>
-                                        <gml:LinearRing gml:id="PolyID7354_1362_450904_410226_0">
-                                            <gml:pos>457842 5439093 115.430940107676 </gml:pos>
-                                            <gml:pos>457854 5439093 115.430940107676 </gml:pos>
-                                            <gml:pos>457854 5439093 111.8 </gml:pos>
-                                            <gml:pos>457842 5439093 111.8 </gml:pos>
-                                            <gml:pos>457842 5439093 115.430940107676 </gml:pos>
-                                        </gml:LinearRing>
-                                    </gml:exterior>
-                                </gml:Polygon>
-                            </gml:surfaceMember>
-                        </gml:MultiSurface>
-                    </bldg:lod2MultiSurface>
-                </bldg:WallSurface>
-            </bldg:boundedBy>
-            <bldg:boundedBy>
-                <bldg:RoofSurface gml:id="GML_eeb6796a-e261-4d3b-a6f2-475940cca80a">
-                    <gml:name>Roof 2 (South)</gml:name>
-                    <bldg:lod2MultiSurface>
-                        <gml:MultiSurface>
-                            <gml:surfaceMember>
-                                <gml:Polygon gml:id="PolyID7355_537_416207_260034">
-                                    <gml:exterior>
-                                        <gml:LinearRing gml:id="PolyID7355_537_416207_260034_0">
-                                            <gml:pos>457854 5439083 115.430940107676 </gml:pos>
-                                            <gml:pos>457854 5439088 118.317691453624 </gml:pos>
-                                            <gml:pos>457842 5439088 118.317691453624 </gml:pos>
-                                            <gml:pos>457842 5439083 115.430940107676 </gml:pos>
-                                            <gml:pos>457854 5439083 115.430940107676 </gml:pos>
-                                        </gml:LinearRing>
-                                    </gml:exterior>
-                                </gml:Polygon>
-                            </gml:surfaceMember>
-                        </gml:MultiSurface>
-                    </bldg:lod2MultiSurface>
-                </bldg:RoofSurface>
-            </bldg:boundedBy>
-            <bldg:boundedBy>
-                <bldg:GroundSurface gml:id="GML_257a8dde-8194-4ca3-b581-abd591dcd6a3">
-                    <gml:description>Bodenplatte</gml:description>
-                    <gml:name>Base Surface</gml:name>
-                    <bldg:lod2MultiSurface>
-                        <gml:MultiSurface>
-                            <gml:surfaceMember>
-                                <gml:Polygon gml:id="PolyID7356_612_880782_415367">
-                                    <gml:exterior>
-                                        <gml:LinearRing gml:id="PolyID7356_612_880782_415367_0">
-                                            <gml:pos>457854 5439083 111.8 </gml:pos>
-                                            <gml:pos>457842 5439083 111.8 </gml:pos>
-                                            <gml:pos>457842 5439093 111.8 </gml:pos>
-                                            <gml:pos>457854 5439093 111.8 </gml:pos>
-                                            <gml:pos>457854 5439083 111.8 </gml:pos>
-                                        </gml:LinearRing>
-                                    </gml:exterior>
-                                </gml:Polygon>
-                            </gml:surfaceMember>
-                        </gml:MultiSurface>
-                    </bldg:lod2MultiSurface>
-                </bldg:GroundSurface>
-            </bldg:boundedBy>
-            <bldg:address>
-                <core:Address>
-                    <core:xalAddress>
-                        <xAL:AddressDetails>
-                            <xAL:Locality Type="Town">
-                                <xAL:LocalityName>Eggenstein-Leopoldshafen</xAL:LocalityName>
-                                <xAL:Thoroughfare Type="Street">
-                                    <xAL:ThoroughfareNumber>4711</xAL:ThoroughfareNumber>
-                                    <xAL:ThoroughfareName>Spöcker Straße</xAL:ThoroughfareName>
-                                </xAL:Thoroughfare>
-                                <xAL:PostalCode>
-                                    <xAL:PostalCodeNumber>76344</xAL:PostalCodeNumber>
-                                </xAL:PostalCode>
-                            </xAL:Locality>
-                        </xAL:AddressDetails>
-                    </core:xalAddress>
-                </core:Address>
-            </bldg:address>
-        </bldg:Building>
-    </core:cityObjectMember>
+<?xml version="1.0" encoding="utf-8"?><!-- IFC to CityGML by IFCExplorer KIT --><!-- CityGML to Sketchup by  Sketchup CityGML Plugin FH GelsenKirchen --><!--CityGML Dataset produced with CityGML Export Plugin for Sketchup by GeoRES --><!--http://www.geores.de --><!-- Edited Manually in Oxygen 8.2 --><!-- Modified by GMLOffset.xslt at Mon Dec 6 2010 --><!-- Version 2 Building located in the area of KIT Campus North)--><!-- Modified by GMLOffset.xslt at Wed Dec 8 2010 --><!-- Modified by GMLOffset.xslt at Wed Mar 29 2017 --><core:CityModel xsi:schemaLocation="http://www.opengis.net/citygml/2.0 http://schemas.opengis.net/citygml/2.0/cityGMLBase.xsd  http://www.opengis.net/citygml/appearance/2.0 http://schemas.opengis.net/citygml/appearance/2.0/appearance.xsd http://www.opengis.net/citygml/building/2.0 http://schemas.opengis.net/citygml/building/2.0/building.xsd http://www.opengis.net/citygml/generics/2.0 http://schemas.opengis.net/citygml/generics/2.0/generics.xsd" xmlns:core="http://www.opengis.net/citygml/2.0" xmlns="http://www.opengis.net/citygml/profiles/base/2.0" xmlns:bldg="http://www.opengis.net/citygml/building/2.0" xmlns:gen="http://www.opengis.net/citygml/generics/2.0" xmlns:grp="http://www.opengis.net/citygml/cityobjectgroup/2.0" xmlns:app="http://www.opengis.net/citygml/appearance/2.0" xmlns:gml="http://www.opengis.net/gml" xmlns:xAL="urn:oasis:names:tc:ciq:xsdschema:xAL:2.0" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+    <!-- Manually edited by KHH 23.01.2017, CityGML 2.0, Address added, Codespaces added -->
+    <gml:name>AC14-FZK-Haus</gml:name>
+    <gml:boundedBy>
+        <gml:Envelope srsDimension="3" srsName="urn:adv:crs:ETRS89_UTM32*DE_DHHN92_NH">
+            <gml:lowerCorner srsDimension="3">457842 5439083 111.8 </gml:lowerCorner>
+            <gml:upperCorner srsDimension="3">457854 5439093 118.317669 </gml:upperCorner>
+        </gml:Envelope>
+    </gml:boundedBy> 
+    <core:cityObjectMember>
+        <bldg:Building gml:id="UUID_d281adfc-4901-0f52-540b-4cc1a9325f82">
+            <gml:description>FZK-Haus (Forschungszentrum Karlsruhe, now KIT), created by Karl-Heinz
+                Haefele </gml:description>
+            <gml:name>AC14-FZK-Haus</gml:name>
+            <core:creationDate>2017-01-23</core:creationDate>
+            <core:relativeToTerrain>entirelyAboveTerrain</core:relativeToTerrain>
+            <gen:measureAttribute name="GrossPlannedArea">
+                <gen:value uom="m2">120.00</gen:value>
+            </gen:measureAttribute>
+            <gen:stringAttribute name="ConstructionMethod">
+                <gen:value>New Building</gen:value>
+            </gen:stringAttribute>
+            <gen:stringAttribute name="IsLandmarked">
+                <gen:value>NO</gen:value>
+            </gen:stringAttribute>
+            <bldg:class codeSpace="http://www.sig3d.org/codelists/citygml/2.0/building/2.0/_AbstractBuilding_class.xml">1000</bldg:class>
+            <bldg:function codeSpace="http://www.sig3d.org/codelists/citygml/2.0/building/2.0/_AbstractBuilding_function.xml">1000</bldg:function>
+            <bldg:usage codeSpace="http://www.sig3d.org/codelists/citygml/2.0/building/2.0/_AbstractBuilding_usage.xml">1000</bldg:usage>
+            <bldg:yearOfConstruction>2020</bldg:yearOfConstruction>
+            <bldg:roofType codeSpace="http://www.sig3d.org/codelists/citygml/2.0/building/2.0/_AbstractBuilding_roofType.xml">1030</bldg:roofType>
+            <bldg:measuredHeight uom="m">6.52</bldg:measuredHeight>
+            <bldg:storeysAboveGround>2</bldg:storeysAboveGround>
+            <bldg:storeysBelowGround>0</bldg:storeysBelowGround>
+            <bldg:lod2Solid>
+                <gml:Solid>
+                    <gml:exterior>
+                        <gml:CompositeSurface>
+                            <!--Outer Wall 1 (West)  -->
+                            <gml:surfaceMember xlink:href="#PolyID7350_878_759628_120742"> </gml:surfaceMember>
+                            <!--Outer Wall 1 (West)  -->
+                            <!--Outer Wall 2 (South)  -->
+                            <gml:surfaceMember xlink:href="#PolyID7351_1722_416019_316876" />
+                            <!--Outer Wall 2 (South)  -->
+                            <!--Outer Wall 3 (East)  -->
+                            <gml:surfaceMember xlink:href="#PolyID7352_230_209861_355851" />
+                            <!--Outer Wall 3 (East)  -->
+                            <!--Roof 1 (North)  -->
+                            <gml:surfaceMember xlink:href="#PolyID7353_166_774155_320806" />
+                            <!--Roof 1 (North)  -->
+                            <!--Outer Wall 4 (North)  -->
+                            <gml:surfaceMember xlink:href="#PolyID7354_1362_450904_410226" />
+                            <!--Outer Wall 2 (North)  -->
+                            <!--Roof 2 (South)  -->
+                            <gml:surfaceMember xlink:href="#PolyID7355_537_416207_260034" />
+                            <!--Roof 2 (South)  -->
+                            <!--Base Surface  -->
+                            <gml:surfaceMember xlink:href="#PolyID7356_612_880782_415367" />
+                            <!--Base Surface  -->
+                        </gml:CompositeSurface>
+                    </gml:exterior>
+                </gml:Solid>
+            </bldg:lod2Solid>
+            <bldg:boundedBy>
+                <bldg:WallSurface gml:id="GML_5856d7ad-5e34-498a-817b-9544bfbb1475">
+                    <gml:name>Outer Wall 1 (West)</gml:name>
+                    <bldg:lod2MultiSurface>
+                        <gml:MultiSurface>
+                            <gml:surfaceMember>
+                                <gml:Polygon gml:id="PolyID7350_878_759628_120742">
+                                    <gml:exterior>
+                                        <gml:LinearRing gml:id="PolyID7350_878_759628_120742_0">
+                                            <gml:pos>457842 5439088 118.317691453624 </gml:pos>
+                                            <gml:pos>457842 5439093 115.430940107676 </gml:pos>
+                                            <gml:pos>457842 5439093 111.8 </gml:pos>
+                                            <gml:pos>457842 5439083 111.8 </gml:pos>
+                                            <gml:pos>457842 5439083 115.430940107676 </gml:pos>
+                                            <gml:pos>457842 5439088 118.317691453624 </gml:pos>
+                                        </gml:LinearRing>
+                                    </gml:exterior>
+                                </gml:Polygon>
+                            </gml:surfaceMember>
+                        </gml:MultiSurface>
+                    </bldg:lod2MultiSurface>
+                </bldg:WallSurface>
+            </bldg:boundedBy>
+            <bldg:boundedBy>
+                <bldg:WallSurface gml:id="GML_d38cf762-c29d-4491-88c9-bdc89e141978">
+                    <gml:name>Outer Wall 2 (South)</gml:name>
+                    <bldg:lod2MultiSurface>
+                        <gml:MultiSurface>
+                            <gml:surfaceMember>
+                                <gml:Polygon gml:id="PolyID7351_1722_416019_316876">
+                                    <gml:exterior>
+                                        <gml:LinearRing gml:id="PolyID7351_1722_416019_316876_0">
+                                            <gml:pos>457854 5439083 115.430940107676 </gml:pos>
+                                            <gml:pos>457842 5439083 115.430940107676 </gml:pos>
+                                            <gml:pos>457842 5439083 111.8 </gml:pos>
+                                            <gml:pos>457854 5439083 111.8 </gml:pos>
+                                            <gml:pos>457854 5439083 115.430940107676 </gml:pos>
+                                        </gml:LinearRing>
+                                    </gml:exterior>
+                                </gml:Polygon>
+                            </gml:surfaceMember>
+                        </gml:MultiSurface>
+                    </bldg:lod2MultiSurface>
+                </bldg:WallSurface>
+            </bldg:boundedBy>
+            <bldg:boundedBy>
+                <bldg:WallSurface gml:id="GML_8e5db638-e46a-4739-a98a-2fc2d39c9069">
+                    <gml:name>Outer Wall 3 (East)</gml:name>
+                    <bldg:lod2MultiSurface>
+                        <gml:MultiSurface>
+                            <gml:surfaceMember>
+                                <gml:Polygon gml:id="PolyID7352_230_209861_355851">
+                                    <gml:exterior>
+                                        <gml:LinearRing gml:id="PolyID7352_230_209861_355851_0">
+                                            <gml:pos>457854 5439088 118.317691453624 </gml:pos>
+                                            <gml:pos>457854 5439083 115.430940107676 </gml:pos>
+                                            <gml:pos>457854 5439083 111.8 </gml:pos>
+                                            <gml:pos>457854 5439093 111.8 </gml:pos>
+                                            <gml:pos>457854 5439093 115.430940107676 </gml:pos>
+                                            <gml:pos>457854 5439088 118.317691453624 </gml:pos>
+                                        </gml:LinearRing>
+                                    </gml:exterior>
+                                </gml:Polygon>
+                            </gml:surfaceMember>
+                        </gml:MultiSurface>
+                    </bldg:lod2MultiSurface>
+                </bldg:WallSurface>
+            </bldg:boundedBy>
+            <bldg:boundedBy>
+                <bldg:RoofSurface gml:id="GML_875d470b-32b4-4985-a4c8-0f02caa342a2">
+                    <gml:name>Roof 1 (North)</gml:name>
+                    <bldg:lod2MultiSurface>
+                        <gml:MultiSurface>
+                            <gml:surfaceMember>
+                                <gml:Polygon gml:id="PolyID7353_166_774155_320806">
+                                    <gml:exterior>
+                                        <gml:LinearRing gml:id="PolyID7353_166_774155_320806_0">
+                                            <gml:pos>457842 5439088 118.317691453624 </gml:pos>
+                                            <gml:pos>457854 5439088 118.317691453624 </gml:pos>
+                                            <gml:pos>457854 5439093 115.430940107676 </gml:pos>
+                                            <gml:pos>457842 5439093 115.430940107676 </gml:pos>
+                                            <gml:pos>457842 5439088 118.317691453624 </gml:pos>
+                                        </gml:LinearRing>
+                                    </gml:exterior>
+                                </gml:Polygon>
+                            </gml:surfaceMember>
+                        </gml:MultiSurface>
+                    </bldg:lod2MultiSurface>
+                </bldg:RoofSurface>
+            </bldg:boundedBy>
+            <bldg:boundedBy>
+                <bldg:WallSurface gml:id="GML_0f30f604-e70d-4dfe-ba35-853bc69609cc">
+                    <gml:name>Outer Wall 4 (North)</gml:name>
+                    <bldg:lod2MultiSurface>
+                        <gml:MultiSurface>
+                            <gml:surfaceMember>
+                                <gml:Polygon gml:id="PolyID7354_1362_450904_410226">
+                                    <gml:exterior>
+                                        <gml:LinearRing gml:id="PolyID7354_1362_450904_410226_0">
+                                            <gml:pos>457842 5439093 115.430940107676 </gml:pos>
+                                            <gml:pos>457854 5439093 115.430940107676 </gml:pos>
+                                            <gml:pos>457854 5439093 111.8 </gml:pos>
+                                            <gml:pos>457842 5439093 111.8 </gml:pos>
+                                            <gml:pos>457842 5439093 115.430940107676 </gml:pos>
+                                        </gml:LinearRing>
+                                    </gml:exterior>
+                                </gml:Polygon>
+                            </gml:surfaceMember>
+                        </gml:MultiSurface>
+                    </bldg:lod2MultiSurface>
+                </bldg:WallSurface>
+            </bldg:boundedBy>
+            <bldg:boundedBy>
+                <bldg:RoofSurface gml:id="GML_eeb6796a-e261-4d3b-a6f2-475940cca80a">
+                    <gml:name>Roof 2 (South)</gml:name>
+                    <bldg:lod2MultiSurface>
+                        <gml:MultiSurface>
+                            <gml:surfaceMember>
+                                <gml:Polygon gml:id="PolyID7355_537_416207_260034">
+                                    <gml:exterior>
+                                        <gml:LinearRing gml:id="PolyID7355_537_416207_260034_0">
+                                            <gml:pos>457854 5439083 115.430940107676 </gml:pos>
+                                            <gml:pos>457854 5439088 118.317691453624 </gml:pos>
+                                            <gml:pos>457842 5439088 118.317691453624 </gml:pos>
+                                            <gml:pos>457842 5439083 115.430940107676 </gml:pos>
+                                            <gml:pos>457854 5439083 115.430940107676 </gml:pos>
+                                        </gml:LinearRing>
+                                    </gml:exterior>
+                                </gml:Polygon>
+                            </gml:surfaceMember>
+                        </gml:MultiSurface>
+                    </bldg:lod2MultiSurface>
+                </bldg:RoofSurface>
+            </bldg:boundedBy>
+            <bldg:boundedBy>
+                <bldg:GroundSurface gml:id="GML_257a8dde-8194-4ca3-b581-abd591dcd6a3">
+                    <gml:description>Bodenplatte</gml:description>
+                    <gml:name>Base Surface</gml:name>
+                    <bldg:lod2MultiSurface>
+                        <gml:MultiSurface>
+                            <gml:surfaceMember>
+                                <gml:Polygon gml:id="PolyID7356_612_880782_415367">
+                                    <gml:exterior>
+                                        <gml:LinearRing gml:id="PolyID7356_612_880782_415367_0">
+                                            <gml:pos>457854 5439083 111.8 </gml:pos>
+                                            <gml:pos>457842 5439083 111.8 </gml:pos>
+                                            <gml:pos>457842 5439093 111.8 </gml:pos>
+                                            <gml:pos>457854 5439093 111.8 </gml:pos>
+                                            <gml:pos>457854 5439083 111.8 </gml:pos>
+                                        </gml:LinearRing>
+                                    </gml:exterior>
+                                </gml:Polygon>
+                            </gml:surfaceMember>
+                        </gml:MultiSurface>
+                    </bldg:lod2MultiSurface>
+                </bldg:GroundSurface>
+            </bldg:boundedBy>
+            <bldg:address>
+                <core:Address>
+                    <core:xalAddress>
+                        <xAL:AddressDetails>
+                            <xAL:Locality Type="Town">
+                                <xAL:LocalityName>Eggenstein-Leopoldshafen</xAL:LocalityName>
+                                <xAL:Thoroughfare Type="Street">
+                                    <xAL:ThoroughfareNumber>4711</xAL:ThoroughfareNumber>
+                                    <xAL:ThoroughfareName>Spöcker Straße</xAL:ThoroughfareName>
+                                </xAL:Thoroughfare>
+                                <xAL:PostalCode>
+                                    <xAL:PostalCodeNumber>76344</xAL:PostalCodeNumber>
+                                </xAL:PostalCode>
+                            </xAL:Locality>
+                        </xAL:AddressDetails>
+                    </core:xalAddress>
+                </core:Address>
+            </bldg:address>
+        </bldg:Building>
+    </core:cityObjectMember>
 </core:CityModel>
\ No newline at end of file
diff --git a/Level0/main.py b/support_material/tutorial_0/main_level_0.py
similarity index 65%
rename from Level0/main.py
rename to support_material/tutorial_0/main_level_0.py
index 9c8a674..47ea530 100644
--- a/Level0/main.py
+++ b/support_material/tutorial_0/main_level_0.py
@@ -1,13 +1,15 @@
-from hub.imports.geometry_factory import GeometryFactory
-from hub.exports.exports_factory import ExportsFactory
-
-
-gml_file = './FZK-Haus-LoD2-KIT-IAI-KHH-B36-V1.gml'
-city = GeometryFactory('citygml', gml_file).city
-
-for building in city.buildings:
-  print(building.name)
-  print(building.volume)
-  print(building.floor_area)
-
-ExportsFactory('obj', city, './').export()
+from pathlib import Path
+from hub.imports.geometry_factory import GeometryFactory
+from hub.exports.exports_factory import ExportsFactory
+
+
+gml_file = 'FZK-Haus-LoD2-KIT-IAI-KHH-B36-V1.gml'
+city = GeometryFactory('citygml', gml_file).city
+path = Path(__file__).parent
+
+for building in city.buildings:
+  print(building.name)
+  print(building.volume)
+  print(building.floor_area)
+
+ExportsFactory('obj', city, path).export()
diff --git a/Level0/FZK-Haus-LoD2-KIT-IAI-KHH-B36-V1.gml b/support_material/tutorial_1/FZK-Haus-LoD2-KIT-IAI-KHH-B36-V1.gml
similarity index 98%
rename from Level0/FZK-Haus-LoD2-KIT-IAI-KHH-B36-V1.gml
rename to support_material/tutorial_1/FZK-Haus-LoD2-KIT-IAI-KHH-B36-V1.gml
index baf0544..04c9be7 100644
--- a/Level0/FZK-Haus-LoD2-KIT-IAI-KHH-B36-V1.gml
+++ b/support_material/tutorial_1/FZK-Haus-LoD2-KIT-IAI-KHH-B36-V1.gml
@@ -1,240 +1,240 @@
-<?xml version="1.0" encoding="utf-8"?><!-- IFC to CityGML by IFCExplorer KIT --><!-- CityGML to Sketchup by  Sketchup CityGML Plugin FH GelsenKirchen --><!--CityGML Dataset produced with CityGML Export Plugin for Sketchup by GeoRES --><!--http://www.geores.de --><!-- Edited Manually in Oxygen 8.2 --><!-- Modified by GMLOffset.xslt at Mon Dec 6 2010 --><!-- Version 2 Building located in the area of KIT Campus North)--><!-- Modified by GMLOffset.xslt at Wed Dec 8 2010 --><!-- Modified by GMLOffset.xslt at Wed Mar 29 2017 --><core:CityModel xsi:schemaLocation="http://www.opengis.net/citygml/2.0 http://schemas.opengis.net/citygml/2.0/cityGMLBase.xsd  http://www.opengis.net/citygml/appearance/2.0 http://schemas.opengis.net/citygml/appearance/2.0/appearance.xsd http://www.opengis.net/citygml/building/2.0 http://schemas.opengis.net/citygml/building/2.0/building.xsd http://www.opengis.net/citygml/generics/2.0 http://schemas.opengis.net/citygml/generics/2.0/generics.xsd" xmlns:core="http://www.opengis.net/citygml/2.0" xmlns="http://www.opengis.net/citygml/profiles/base/2.0" xmlns:bldg="http://www.opengis.net/citygml/building/2.0" xmlns:gen="http://www.opengis.net/citygml/generics/2.0" xmlns:grp="http://www.opengis.net/citygml/cityobjectgroup/2.0" xmlns:app="http://www.opengis.net/citygml/appearance/2.0" xmlns:gml="http://www.opengis.net/gml" xmlns:xAL="urn:oasis:names:tc:ciq:xsdschema:xAL:2.0" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
-    <!-- Manually edited by KHH 23.01.2017, CityGML 2.0, Address added, Codespaces added -->
-    <gml:name>AC14-FZK-Haus</gml:name>
-    <gml:boundedBy>
-        <gml:Envelope srsDimension="3" srsName="urn:adv:crs:ETRS89_UTM32*DE_DHHN92_NH">
-            <gml:lowerCorner srsDimension="3">457842 5439083 111.8 </gml:lowerCorner>
-            <gml:upperCorner srsDimension="3">457854 5439093 118.317669 </gml:upperCorner>
-        </gml:Envelope>
-    </gml:boundedBy> 
-    <core:cityObjectMember>
-        <bldg:Building gml:id="UUID_d281adfc-4901-0f52-540b-4cc1a9325f82">
-            <gml:description>FZK-Haus (Forschungszentrum Karlsruhe, now KIT), created by Karl-Heinz
-                Haefele </gml:description>
-            <gml:name>AC14-FZK-Haus</gml:name>
-            <core:creationDate>2017-01-23</core:creationDate>
-            <core:relativeToTerrain>entirelyAboveTerrain</core:relativeToTerrain>
-            <gen:measureAttribute name="GrossPlannedArea">
-                <gen:value uom="m2">120.00</gen:value>
-            </gen:measureAttribute>
-            <gen:stringAttribute name="ConstructionMethod">
-                <gen:value>New Building</gen:value>
-            </gen:stringAttribute>
-            <gen:stringAttribute name="IsLandmarked">
-                <gen:value>NO</gen:value>
-            </gen:stringAttribute>
-            <bldg:class codeSpace="http://www.sig3d.org/codelists/citygml/2.0/building/2.0/_AbstractBuilding_class.xml">1000</bldg:class>
-            <bldg:function codeSpace="http://www.sig3d.org/codelists/citygml/2.0/building/2.0/_AbstractBuilding_function.xml">1000</bldg:function>
-            <bldg:usage codeSpace="http://www.sig3d.org/codelists/citygml/2.0/building/2.0/_AbstractBuilding_usage.xml">1000</bldg:usage>
-            <bldg:yearOfConstruction>2020</bldg:yearOfConstruction>
-            <bldg:roofType codeSpace="http://www.sig3d.org/codelists/citygml/2.0/building/2.0/_AbstractBuilding_roofType.xml">1030</bldg:roofType>
-            <bldg:measuredHeight uom="m">6.52</bldg:measuredHeight>
-            <bldg:storeysAboveGround>2</bldg:storeysAboveGround>
-            <bldg:storeysBelowGround>0</bldg:storeysBelowGround>
-            <bldg:lod2Solid>
-                <gml:Solid>
-                    <gml:exterior>
-                        <gml:CompositeSurface>
-                            <!--Outer Wall 1 (West)  -->
-                            <gml:surfaceMember xlink:href="#PolyID7350_878_759628_120742"> </gml:surfaceMember>
-                            <!--Outer Wall 1 (West)  -->
-                            <!--Outer Wall 2 (South)  -->
-                            <gml:surfaceMember xlink:href="#PolyID7351_1722_416019_316876" />
-                            <!--Outer Wall 2 (South)  -->
-                            <!--Outer Wall 3 (East)  -->
-                            <gml:surfaceMember xlink:href="#PolyID7352_230_209861_355851" />
-                            <!--Outer Wall 3 (East)  -->
-                            <!--Roof 1 (North)  -->
-                            <gml:surfaceMember xlink:href="#PolyID7353_166_774155_320806" />
-                            <!--Roof 1 (North)  -->
-                            <!--Outer Wall 4 (North)  -->
-                            <gml:surfaceMember xlink:href="#PolyID7354_1362_450904_410226" />
-                            <!--Outer Wall 2 (North)  -->
-                            <!--Roof 2 (South)  -->
-                            <gml:surfaceMember xlink:href="#PolyID7355_537_416207_260034" />
-                            <!--Roof 2 (South)  -->
-                            <!--Base Surface  -->
-                            <gml:surfaceMember xlink:href="#PolyID7356_612_880782_415367" />
-                            <!--Base Surface  -->
-                        </gml:CompositeSurface>
-                    </gml:exterior>
-                </gml:Solid>
-            </bldg:lod2Solid>
-            <bldg:boundedBy>
-                <bldg:WallSurface gml:id="GML_5856d7ad-5e34-498a-817b-9544bfbb1475">
-                    <gml:name>Outer Wall 1 (West)</gml:name>
-                    <bldg:lod2MultiSurface>
-                        <gml:MultiSurface>
-                            <gml:surfaceMember>
-                                <gml:Polygon gml:id="PolyID7350_878_759628_120742">
-                                    <gml:exterior>
-                                        <gml:LinearRing gml:id="PolyID7350_878_759628_120742_0">
-                                            <gml:pos>457842 5439088 118.317691453624 </gml:pos>
-                                            <gml:pos>457842 5439093 115.430940107676 </gml:pos>
-                                            <gml:pos>457842 5439093 111.8 </gml:pos>
-                                            <gml:pos>457842 5439083 111.8 </gml:pos>
-                                            <gml:pos>457842 5439083 115.430940107676 </gml:pos>
-                                            <gml:pos>457842 5439088 118.317691453624 </gml:pos>
-                                        </gml:LinearRing>
-                                    </gml:exterior>
-                                </gml:Polygon>
-                            </gml:surfaceMember>
-                        </gml:MultiSurface>
-                    </bldg:lod2MultiSurface>
-                </bldg:WallSurface>
-            </bldg:boundedBy>
-            <bldg:boundedBy>
-                <bldg:WallSurface gml:id="GML_d38cf762-c29d-4491-88c9-bdc89e141978">
-                    <gml:name>Outer Wall 2 (South)</gml:name>
-                    <bldg:lod2MultiSurface>
-                        <gml:MultiSurface>
-                            <gml:surfaceMember>
-                                <gml:Polygon gml:id="PolyID7351_1722_416019_316876">
-                                    <gml:exterior>
-                                        <gml:LinearRing gml:id="PolyID7351_1722_416019_316876_0">
-                                            <gml:pos>457854 5439083 115.430940107676 </gml:pos>
-                                            <gml:pos>457842 5439083 115.430940107676 </gml:pos>
-                                            <gml:pos>457842 5439083 111.8 </gml:pos>
-                                            <gml:pos>457854 5439083 111.8 </gml:pos>
-                                            <gml:pos>457854 5439083 115.430940107676 </gml:pos>
-                                        </gml:LinearRing>
-                                    </gml:exterior>
-                                </gml:Polygon>
-                            </gml:surfaceMember>
-                        </gml:MultiSurface>
-                    </bldg:lod2MultiSurface>
-                </bldg:WallSurface>
-            </bldg:boundedBy>
-            <bldg:boundedBy>
-                <bldg:WallSurface gml:id="GML_8e5db638-e46a-4739-a98a-2fc2d39c9069">
-                    <gml:name>Outer Wall 3 (East)</gml:name>
-                    <bldg:lod2MultiSurface>
-                        <gml:MultiSurface>
-                            <gml:surfaceMember>
-                                <gml:Polygon gml:id="PolyID7352_230_209861_355851">
-                                    <gml:exterior>
-                                        <gml:LinearRing gml:id="PolyID7352_230_209861_355851_0">
-                                            <gml:pos>457854 5439088 118.317691453624 </gml:pos>
-                                            <gml:pos>457854 5439083 115.430940107676 </gml:pos>
-                                            <gml:pos>457854 5439083 111.8 </gml:pos>
-                                            <gml:pos>457854 5439093 111.8 </gml:pos>
-                                            <gml:pos>457854 5439093 115.430940107676 </gml:pos>
-                                            <gml:pos>457854 5439088 118.317691453624 </gml:pos>
-                                        </gml:LinearRing>
-                                    </gml:exterior>
-                                </gml:Polygon>
-                            </gml:surfaceMember>
-                        </gml:MultiSurface>
-                    </bldg:lod2MultiSurface>
-                </bldg:WallSurface>
-            </bldg:boundedBy>
-            <bldg:boundedBy>
-                <bldg:RoofSurface gml:id="GML_875d470b-32b4-4985-a4c8-0f02caa342a2">
-                    <gml:name>Roof 1 (North)</gml:name>
-                    <bldg:lod2MultiSurface>
-                        <gml:MultiSurface>
-                            <gml:surfaceMember>
-                                <gml:Polygon gml:id="PolyID7353_166_774155_320806">
-                                    <gml:exterior>
-                                        <gml:LinearRing gml:id="PolyID7353_166_774155_320806_0">
-                                            <gml:pos>457842 5439088 118.317691453624 </gml:pos>
-                                            <gml:pos>457854 5439088 118.317691453624 </gml:pos>
-                                            <gml:pos>457854 5439093 115.430940107676 </gml:pos>
-                                            <gml:pos>457842 5439093 115.430940107676 </gml:pos>
-                                            <gml:pos>457842 5439088 118.317691453624 </gml:pos>
-                                        </gml:LinearRing>
-                                    </gml:exterior>
-                                </gml:Polygon>
-                            </gml:surfaceMember>
-                        </gml:MultiSurface>
-                    </bldg:lod2MultiSurface>
-                </bldg:RoofSurface>
-            </bldg:boundedBy>
-            <bldg:boundedBy>
-                <bldg:WallSurface gml:id="GML_0f30f604-e70d-4dfe-ba35-853bc69609cc">
-                    <gml:name>Outer Wall 4 (North)</gml:name>
-                    <bldg:lod2MultiSurface>
-                        <gml:MultiSurface>
-                            <gml:surfaceMember>
-                                <gml:Polygon gml:id="PolyID7354_1362_450904_410226">
-                                    <gml:exterior>
-                                        <gml:LinearRing gml:id="PolyID7354_1362_450904_410226_0">
-                                            <gml:pos>457842 5439093 115.430940107676 </gml:pos>
-                                            <gml:pos>457854 5439093 115.430940107676 </gml:pos>
-                                            <gml:pos>457854 5439093 111.8 </gml:pos>
-                                            <gml:pos>457842 5439093 111.8 </gml:pos>
-                                            <gml:pos>457842 5439093 115.430940107676 </gml:pos>
-                                        </gml:LinearRing>
-                                    </gml:exterior>
-                                </gml:Polygon>
-                            </gml:surfaceMember>
-                        </gml:MultiSurface>
-                    </bldg:lod2MultiSurface>
-                </bldg:WallSurface>
-            </bldg:boundedBy>
-            <bldg:boundedBy>
-                <bldg:RoofSurface gml:id="GML_eeb6796a-e261-4d3b-a6f2-475940cca80a">
-                    <gml:name>Roof 2 (South)</gml:name>
-                    <bldg:lod2MultiSurface>
-                        <gml:MultiSurface>
-                            <gml:surfaceMember>
-                                <gml:Polygon gml:id="PolyID7355_537_416207_260034">
-                                    <gml:exterior>
-                                        <gml:LinearRing gml:id="PolyID7355_537_416207_260034_0">
-                                            <gml:pos>457854 5439083 115.430940107676 </gml:pos>
-                                            <gml:pos>457854 5439088 118.317691453624 </gml:pos>
-                                            <gml:pos>457842 5439088 118.317691453624 </gml:pos>
-                                            <gml:pos>457842 5439083 115.430940107676 </gml:pos>
-                                            <gml:pos>457854 5439083 115.430940107676 </gml:pos>
-                                        </gml:LinearRing>
-                                    </gml:exterior>
-                                </gml:Polygon>
-                            </gml:surfaceMember>
-                        </gml:MultiSurface>
-                    </bldg:lod2MultiSurface>
-                </bldg:RoofSurface>
-            </bldg:boundedBy>
-            <bldg:boundedBy>
-                <bldg:GroundSurface gml:id="GML_257a8dde-8194-4ca3-b581-abd591dcd6a3">
-                    <gml:description>Bodenplatte</gml:description>
-                    <gml:name>Base Surface</gml:name>
-                    <bldg:lod2MultiSurface>
-                        <gml:MultiSurface>
-                            <gml:surfaceMember>
-                                <gml:Polygon gml:id="PolyID7356_612_880782_415367">
-                                    <gml:exterior>
-                                        <gml:LinearRing gml:id="PolyID7356_612_880782_415367_0">
-                                            <gml:pos>457854 5439083 111.8 </gml:pos>
-                                            <gml:pos>457842 5439083 111.8 </gml:pos>
-                                            <gml:pos>457842 5439093 111.8 </gml:pos>
-                                            <gml:pos>457854 5439093 111.8 </gml:pos>
-                                            <gml:pos>457854 5439083 111.8 </gml:pos>
-                                        </gml:LinearRing>
-                                    </gml:exterior>
-                                </gml:Polygon>
-                            </gml:surfaceMember>
-                        </gml:MultiSurface>
-                    </bldg:lod2MultiSurface>
-                </bldg:GroundSurface>
-            </bldg:boundedBy>
-            <bldg:address>
-                <core:Address>
-                    <core:xalAddress>
-                        <xAL:AddressDetails>
-                            <xAL:Locality Type="Town">
-                                <xAL:LocalityName>Eggenstein-Leopoldshafen</xAL:LocalityName>
-                                <xAL:Thoroughfare Type="Street">
-                                    <xAL:ThoroughfareNumber>4711</xAL:ThoroughfareNumber>
-                                    <xAL:ThoroughfareName>Spöcker Straße</xAL:ThoroughfareName>
-                                </xAL:Thoroughfare>
-                                <xAL:PostalCode>
-                                    <xAL:PostalCodeNumber>76344</xAL:PostalCodeNumber>
-                                </xAL:PostalCode>
-                            </xAL:Locality>
-                        </xAL:AddressDetails>
-                    </core:xalAddress>
-                </core:Address>
-            </bldg:address>
-        </bldg:Building>
-    </core:cityObjectMember>
+<?xml version="1.0" encoding="utf-8"?><!-- IFC to CityGML by IFCExplorer KIT --><!-- CityGML to Sketchup by  Sketchup CityGML Plugin FH GelsenKirchen --><!--CityGML Dataset produced with CityGML Export Plugin for Sketchup by GeoRES --><!--http://www.geores.de --><!-- Edited Manually in Oxygen 8.2 --><!-- Modified by GMLOffset.xslt at Mon Dec 6 2010 --><!-- Version 2 Building located in the area of KIT Campus North)--><!-- Modified by GMLOffset.xslt at Wed Dec 8 2010 --><!-- Modified by GMLOffset.xslt at Wed Mar 29 2017 --><core:CityModel xsi:schemaLocation="http://www.opengis.net/citygml/2.0 http://schemas.opengis.net/citygml/2.0/cityGMLBase.xsd  http://www.opengis.net/citygml/appearance/2.0 http://schemas.opengis.net/citygml/appearance/2.0/appearance.xsd http://www.opengis.net/citygml/building/2.0 http://schemas.opengis.net/citygml/building/2.0/building.xsd http://www.opengis.net/citygml/generics/2.0 http://schemas.opengis.net/citygml/generics/2.0/generics.xsd" xmlns:core="http://www.opengis.net/citygml/2.0" xmlns="http://www.opengis.net/citygml/profiles/base/2.0" xmlns:bldg="http://www.opengis.net/citygml/building/2.0" xmlns:gen="http://www.opengis.net/citygml/generics/2.0" xmlns:grp="http://www.opengis.net/citygml/cityobjectgroup/2.0" xmlns:app="http://www.opengis.net/citygml/appearance/2.0" xmlns:gml="http://www.opengis.net/gml" xmlns:xAL="urn:oasis:names:tc:ciq:xsdschema:xAL:2.0" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+    <!-- Manually edited by KHH 23.01.2017, CityGML 2.0, Address added, Codespaces added -->
+    <gml:name>AC14-FZK-Haus</gml:name>
+    <gml:boundedBy>
+        <gml:Envelope srsDimension="3" srsName="urn:adv:crs:ETRS89_UTM32*DE_DHHN92_NH">
+            <gml:lowerCorner srsDimension="3">457842 5439083 111.8 </gml:lowerCorner>
+            <gml:upperCorner srsDimension="3">457854 5439093 118.317669 </gml:upperCorner>
+        </gml:Envelope>
+    </gml:boundedBy> 
+    <core:cityObjectMember>
+        <bldg:Building gml:id="UUID_d281adfc-4901-0f52-540b-4cc1a9325f82">
+            <gml:description>FZK-Haus (Forschungszentrum Karlsruhe, now KIT), created by Karl-Heinz
+                Haefele </gml:description>
+            <gml:name>AC14-FZK-Haus</gml:name>
+            <core:creationDate>2017-01-23</core:creationDate>
+            <core:relativeToTerrain>entirelyAboveTerrain</core:relativeToTerrain>
+            <gen:measureAttribute name="GrossPlannedArea">
+                <gen:value uom="m2">120.00</gen:value>
+            </gen:measureAttribute>
+            <gen:stringAttribute name="ConstructionMethod">
+                <gen:value>New Building</gen:value>
+            </gen:stringAttribute>
+            <gen:stringAttribute name="IsLandmarked">
+                <gen:value>NO</gen:value>
+            </gen:stringAttribute>
+            <bldg:class codeSpace="http://www.sig3d.org/codelists/citygml/2.0/building/2.0/_AbstractBuilding_class.xml">1000</bldg:class>
+            <bldg:function codeSpace="http://www.sig3d.org/codelists/citygml/2.0/building/2.0/_AbstractBuilding_function.xml">1000</bldg:function>
+            <bldg:usage codeSpace="http://www.sig3d.org/codelists/citygml/2.0/building/2.0/_AbstractBuilding_usage.xml">1000</bldg:usage>
+            <bldg:yearOfConstruction>2020</bldg:yearOfConstruction>
+            <bldg:roofType codeSpace="http://www.sig3d.org/codelists/citygml/2.0/building/2.0/_AbstractBuilding_roofType.xml">1030</bldg:roofType>
+            <bldg:measuredHeight uom="m">6.52</bldg:measuredHeight>
+            <bldg:storeysAboveGround>2</bldg:storeysAboveGround>
+            <bldg:storeysBelowGround>0</bldg:storeysBelowGround>
+            <bldg:lod2Solid>
+                <gml:Solid>
+                    <gml:exterior>
+                        <gml:CompositeSurface>
+                            <!--Outer Wall 1 (West)  -->
+                            <gml:surfaceMember xlink:href="#PolyID7350_878_759628_120742"> </gml:surfaceMember>
+                            <!--Outer Wall 1 (West)  -->
+                            <!--Outer Wall 2 (South)  -->
+                            <gml:surfaceMember xlink:href="#PolyID7351_1722_416019_316876" />
+                            <!--Outer Wall 2 (South)  -->
+                            <!--Outer Wall 3 (East)  -->
+                            <gml:surfaceMember xlink:href="#PolyID7352_230_209861_355851" />
+                            <!--Outer Wall 3 (East)  -->
+                            <!--Roof 1 (North)  -->
+                            <gml:surfaceMember xlink:href="#PolyID7353_166_774155_320806" />
+                            <!--Roof 1 (North)  -->
+                            <!--Outer Wall 4 (North)  -->
+                            <gml:surfaceMember xlink:href="#PolyID7354_1362_450904_410226" />
+                            <!--Outer Wall 2 (North)  -->
+                            <!--Roof 2 (South)  -->
+                            <gml:surfaceMember xlink:href="#PolyID7355_537_416207_260034" />
+                            <!--Roof 2 (South)  -->
+                            <!--Base Surface  -->
+                            <gml:surfaceMember xlink:href="#PolyID7356_612_880782_415367" />
+                            <!--Base Surface  -->
+                        </gml:CompositeSurface>
+                    </gml:exterior>
+                </gml:Solid>
+            </bldg:lod2Solid>
+            <bldg:boundedBy>
+                <bldg:WallSurface gml:id="GML_5856d7ad-5e34-498a-817b-9544bfbb1475">
+                    <gml:name>Outer Wall 1 (West)</gml:name>
+                    <bldg:lod2MultiSurface>
+                        <gml:MultiSurface>
+                            <gml:surfaceMember>
+                                <gml:Polygon gml:id="PolyID7350_878_759628_120742">
+                                    <gml:exterior>
+                                        <gml:LinearRing gml:id="PolyID7350_878_759628_120742_0">
+                                            <gml:pos>457842 5439088 118.317691453624 </gml:pos>
+                                            <gml:pos>457842 5439093 115.430940107676 </gml:pos>
+                                            <gml:pos>457842 5439093 111.8 </gml:pos>
+                                            <gml:pos>457842 5439083 111.8 </gml:pos>
+                                            <gml:pos>457842 5439083 115.430940107676 </gml:pos>
+                                            <gml:pos>457842 5439088 118.317691453624 </gml:pos>
+                                        </gml:LinearRing>
+                                    </gml:exterior>
+                                </gml:Polygon>
+                            </gml:surfaceMember>
+                        </gml:MultiSurface>
+                    </bldg:lod2MultiSurface>
+                </bldg:WallSurface>
+            </bldg:boundedBy>
+            <bldg:boundedBy>
+                <bldg:WallSurface gml:id="GML_d38cf762-c29d-4491-88c9-bdc89e141978">
+                    <gml:name>Outer Wall 2 (South)</gml:name>
+                    <bldg:lod2MultiSurface>
+                        <gml:MultiSurface>
+                            <gml:surfaceMember>
+                                <gml:Polygon gml:id="PolyID7351_1722_416019_316876">
+                                    <gml:exterior>
+                                        <gml:LinearRing gml:id="PolyID7351_1722_416019_316876_0">
+                                            <gml:pos>457854 5439083 115.430940107676 </gml:pos>
+                                            <gml:pos>457842 5439083 115.430940107676 </gml:pos>
+                                            <gml:pos>457842 5439083 111.8 </gml:pos>
+                                            <gml:pos>457854 5439083 111.8 </gml:pos>
+                                            <gml:pos>457854 5439083 115.430940107676 </gml:pos>
+                                        </gml:LinearRing>
+                                    </gml:exterior>
+                                </gml:Polygon>
+                            </gml:surfaceMember>
+                        </gml:MultiSurface>
+                    </bldg:lod2MultiSurface>
+                </bldg:WallSurface>
+            </bldg:boundedBy>
+            <bldg:boundedBy>
+                <bldg:WallSurface gml:id="GML_8e5db638-e46a-4739-a98a-2fc2d39c9069">
+                    <gml:name>Outer Wall 3 (East)</gml:name>
+                    <bldg:lod2MultiSurface>
+                        <gml:MultiSurface>
+                            <gml:surfaceMember>
+                                <gml:Polygon gml:id="PolyID7352_230_209861_355851">
+                                    <gml:exterior>
+                                        <gml:LinearRing gml:id="PolyID7352_230_209861_355851_0">
+                                            <gml:pos>457854 5439088 118.317691453624 </gml:pos>
+                                            <gml:pos>457854 5439083 115.430940107676 </gml:pos>
+                                            <gml:pos>457854 5439083 111.8 </gml:pos>
+                                            <gml:pos>457854 5439093 111.8 </gml:pos>
+                                            <gml:pos>457854 5439093 115.430940107676 </gml:pos>
+                                            <gml:pos>457854 5439088 118.317691453624 </gml:pos>
+                                        </gml:LinearRing>
+                                    </gml:exterior>
+                                </gml:Polygon>
+                            </gml:surfaceMember>
+                        </gml:MultiSurface>
+                    </bldg:lod2MultiSurface>
+                </bldg:WallSurface>
+            </bldg:boundedBy>
+            <bldg:boundedBy>
+                <bldg:RoofSurface gml:id="GML_875d470b-32b4-4985-a4c8-0f02caa342a2">
+                    <gml:name>Roof 1 (North)</gml:name>
+                    <bldg:lod2MultiSurface>
+                        <gml:MultiSurface>
+                            <gml:surfaceMember>
+                                <gml:Polygon gml:id="PolyID7353_166_774155_320806">
+                                    <gml:exterior>
+                                        <gml:LinearRing gml:id="PolyID7353_166_774155_320806_0">
+                                            <gml:pos>457842 5439088 118.317691453624 </gml:pos>
+                                            <gml:pos>457854 5439088 118.317691453624 </gml:pos>
+                                            <gml:pos>457854 5439093 115.430940107676 </gml:pos>
+                                            <gml:pos>457842 5439093 115.430940107676 </gml:pos>
+                                            <gml:pos>457842 5439088 118.317691453624 </gml:pos>
+                                        </gml:LinearRing>
+                                    </gml:exterior>
+                                </gml:Polygon>
+                            </gml:surfaceMember>
+                        </gml:MultiSurface>
+                    </bldg:lod2MultiSurface>
+                </bldg:RoofSurface>
+            </bldg:boundedBy>
+            <bldg:boundedBy>
+                <bldg:WallSurface gml:id="GML_0f30f604-e70d-4dfe-ba35-853bc69609cc">
+                    <gml:name>Outer Wall 4 (North)</gml:name>
+                    <bldg:lod2MultiSurface>
+                        <gml:MultiSurface>
+                            <gml:surfaceMember>
+                                <gml:Polygon gml:id="PolyID7354_1362_450904_410226">
+                                    <gml:exterior>
+                                        <gml:LinearRing gml:id="PolyID7354_1362_450904_410226_0">
+                                            <gml:pos>457842 5439093 115.430940107676 </gml:pos>
+                                            <gml:pos>457854 5439093 115.430940107676 </gml:pos>
+                                            <gml:pos>457854 5439093 111.8 </gml:pos>
+                                            <gml:pos>457842 5439093 111.8 </gml:pos>
+                                            <gml:pos>457842 5439093 115.430940107676 </gml:pos>
+                                        </gml:LinearRing>
+                                    </gml:exterior>
+                                </gml:Polygon>
+                            </gml:surfaceMember>
+                        </gml:MultiSurface>
+                    </bldg:lod2MultiSurface>
+                </bldg:WallSurface>
+            </bldg:boundedBy>
+            <bldg:boundedBy>
+                <bldg:RoofSurface gml:id="GML_eeb6796a-e261-4d3b-a6f2-475940cca80a">
+                    <gml:name>Roof 2 (South)</gml:name>
+                    <bldg:lod2MultiSurface>
+                        <gml:MultiSurface>
+                            <gml:surfaceMember>
+                                <gml:Polygon gml:id="PolyID7355_537_416207_260034">
+                                    <gml:exterior>
+                                        <gml:LinearRing gml:id="PolyID7355_537_416207_260034_0">
+                                            <gml:pos>457854 5439083 115.430940107676 </gml:pos>
+                                            <gml:pos>457854 5439088 118.317691453624 </gml:pos>
+                                            <gml:pos>457842 5439088 118.317691453624 </gml:pos>
+                                            <gml:pos>457842 5439083 115.430940107676 </gml:pos>
+                                            <gml:pos>457854 5439083 115.430940107676 </gml:pos>
+                                        </gml:LinearRing>
+                                    </gml:exterior>
+                                </gml:Polygon>
+                            </gml:surfaceMember>
+                        </gml:MultiSurface>
+                    </bldg:lod2MultiSurface>
+                </bldg:RoofSurface>
+            </bldg:boundedBy>
+            <bldg:boundedBy>
+                <bldg:GroundSurface gml:id="GML_257a8dde-8194-4ca3-b581-abd591dcd6a3">
+                    <gml:description>Bodenplatte</gml:description>
+                    <gml:name>Base Surface</gml:name>
+                    <bldg:lod2MultiSurface>
+                        <gml:MultiSurface>
+                            <gml:surfaceMember>
+                                <gml:Polygon gml:id="PolyID7356_612_880782_415367">
+                                    <gml:exterior>
+                                        <gml:LinearRing gml:id="PolyID7356_612_880782_415367_0">
+                                            <gml:pos>457854 5439083 111.8 </gml:pos>
+                                            <gml:pos>457842 5439083 111.8 </gml:pos>
+                                            <gml:pos>457842 5439093 111.8 </gml:pos>
+                                            <gml:pos>457854 5439093 111.8 </gml:pos>
+                                            <gml:pos>457854 5439083 111.8 </gml:pos>
+                                        </gml:LinearRing>
+                                    </gml:exterior>
+                                </gml:Polygon>
+                            </gml:surfaceMember>
+                        </gml:MultiSurface>
+                    </bldg:lod2MultiSurface>
+                </bldg:GroundSurface>
+            </bldg:boundedBy>
+            <bldg:address>
+                <core:Address>
+                    <core:xalAddress>
+                        <xAL:AddressDetails>
+                            <xAL:Locality Type="Town">
+                                <xAL:LocalityName>Eggenstein-Leopoldshafen</xAL:LocalityName>
+                                <xAL:Thoroughfare Type="Street">
+                                    <xAL:ThoroughfareNumber>4711</xAL:ThoroughfareNumber>
+                                    <xAL:ThoroughfareName>Spöcker Straße</xAL:ThoroughfareName>
+                                </xAL:Thoroughfare>
+                                <xAL:PostalCode>
+                                    <xAL:PostalCodeNumber>76344</xAL:PostalCodeNumber>
+                                </xAL:PostalCode>
+                            </xAL:Locality>
+                        </xAL:AddressDetails>
+                    </core:xalAddress>
+                </core:Address>
+            </bldg:address>
+        </bldg:Building>
+    </core:cityObjectMember>
 </core:CityModel>
\ No newline at end of file
diff --git a/Level/main_level1.py b/support_material/tutorial_1/main_level_1.py
similarity index 91%
rename from Level/main_level1.py
rename to support_material/tutorial_1/main_level_1.py
index a5b76c3..91c669c 100644
--- a/Level/main_level1.py
+++ b/support_material/tutorial_1/main_level_1.py
@@ -1,33 +1,33 @@
-from hub.imports.geometry_factory import GeometryFactory
-from hub.imports.construction_factory import ConstructionFactory
-from hub.helpers.dictionaries import Dictionaries
-from hub.exports.exports_factory import ExportsFactory
-
-
-# Level0:
-gml_file = './FZK-Haus-LoD2-KIT-IAI-KHH-B36-V1.gml'
-city = GeometryFactory('citygml', gml_file, function_to_hub=Dictionaries().montreal_function_to_hub_function).city
-
-for building in city.buildings:
-  print(building.name)
-  print(building.volume)
-  print(building.floor_area)
-
-
-# Level1:
-city1 = city.copy
-
-for building in city1.buildings:
-  print ("Construction year of building in city1 is: ", building.year_of_construction)
-  print ("Building's function in city1 is: " , building.function)
-
-ConstructionFactory('nrcan',city1).enrich()
-
-for building in city1.buildings:
-  for internal_zone in building.internal_zones:
-    for thermal_zone in internal_zone.thermal_zones:
-      for thermal_boundary in thermal_zone.thermal_boundaries:
-        for layer in thermal_boundary.layers:
-          print(thermal_boundary.internal_surface.type)
-          print(layer.material.name)
-
+from hub.imports.geometry_factory import GeometryFactory
+from hub.imports.construction_factory import ConstructionFactory
+from hub.helpers.dictionaries import Dictionaries
+from hub.exports.exports_factory import ExportsFactory
+
+
+# tutorial_0:
+gml_file = 'FZK-Haus-LoD2-KIT-IAI-KHH-B36-V1.gml'
+city = GeometryFactory('citygml', gml_file, function_to_hub=Dictionaries().montreal_function_to_hub_function).city
+
+for building in city.buildings:
+  print(building.name)
+  print(building.volume)
+  print(building.floor_area)
+
+
+# Level1:
+city1 = city.copy
+
+for building in city1.buildings:
+  print ("Construction year of building in city1 is: ", building.year_of_construction)
+  print ("Building's function in city1 is: " , building.function)
+
+ConstructionFactory('nrcan',city1).enrich()
+
+for building in city1.buildings:
+  for internal_zone in building.internal_zones:
+    for thermal_zone in internal_zone.thermal_zones:
+      for thermal_boundary in thermal_zone.thermal_boundaries:
+        for layer in thermal_boundary.layers:
+          print(thermal_boundary.internal_surface.type)
+          print(layer.material.name)
+