Hi. I am searching for a solution to convert the result of my workflow which is a multi solid to different surfaces including ground, wall and roof. Is it possible in FME? I have searched a lot but it seems to be impossible.
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Converting a multisolid (Building in cityGML) to roof, ground and wall surfaces
Best answer by virtualcitymatt
You can use a GeometryPartExtractor to extract the IFMEFace Geometries. This will give you the surfaces. You can then use a PlanrityFilter to extract the surface normals, once you have the surface normals you can filter based on the Z normal - Positive Z should be a roof, 0 Z should be a wall and -1 Z should be a ground. Sometimes the normals are not quite so perfect for wall or the ground so check is they are close.
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You can use a GeometryPartExtractor to extract the IFMEFace Geometries. This will give you the surfaces. You can then use a PlanrityFilter to extract the surface normals, once you have the surface normals you can filter based on the Z normal - Positive Z should be a roof, 0 Z should be a wall and -1 Z should be a ground. Sometimes the normals are not quite so perfect for wall or the ground so check is they are close.
@virtualcitymatt, thanks for your Reply.
I added them to your last workflow but it doesn't work well. can you please take a look at that and correct it?
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mahbouberezaiee wrote:
@virtualcitymatt, thanks for your Reply.
I added them to your last workflow but it doesn't work well. can you please take a look at that and correct it?
You just need to switch the test in the GeometryPartExtractor to be IFMEFace (not Brep) You want to extract the Face geometries from the Solid
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