Hi, everyone
I'm new to FME, I had some difficulty in getting the geometry shape of walls converted from CityGML to IFC. The details are as follows:
I can get the Guid of each wall, but there is no geometry information, could you give me some help?
Thank you very much.
Best regards
Ying
Best answer by daveatsafe
Hi @wyymsl001,
IFC requires the wall geometry be structured differently than CityGML, so you will need to convert it before writing. CityGML provides WallSurface geometry as a single surface, with no depth. IFC requires that IfcWalls have Solid geometry, usually an extrusion of the base plate to the height of the wall. You may be able get away with extruding the CityGML WallSurface by the wall thickness, using the Extruder transformer.
There is also a specific geometry structure required for including the Property Sets with the IfcWall geometry. Please have a look at the IFC writing example at https://community.safe.com/s/article/autocad-to-ifc-conversion-example to get started.
+19Hi @wyymsl001,
IFC requires the wall geometry be structured differently than CityGML, so you will need to convert it before writing. CityGML provides WallSurface geometry as a single surface, with no depth. IFC requires that IfcWalls have Solid geometry, usually an extrusion of the base plate to the height of the wall. You may be able get away with extruding the CityGML WallSurface by the wall thickness, using the Extruder transformer.
There is also a specific geometry structure required for including the Property Sets with the IfcWall geometry. Please have a look at the IFC writing example at https://community.safe.com/s/article/autocad-to-ifc-conversion-example to get started.
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