How would I isolate the top face of some buildings I've just extruded? - so that I can apply different appearances to the top and the walls.
Solved
Get top face from extruded shape
+8- Contributor
Best answer by virtualcitymatt
Use the GeoemtryCoercer to a CompositeSurface - Use GeometryPartExtractor to get IFMEFaces - You can then use a PlanrityFilter to extract the surface normals. You can use the surface normals to figure out which is Ground (normal z =-1), Wall (normal z=0) and Roof (normal z=1).
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+47- Celebrity
- Best Answer
Use the GeoemtryCoercer to a CompositeSurface - Use GeometryPartExtractor to get IFMEFaces - You can then use a PlanrityFilter to extract the surface normals. You can use the surface normals to figure out which is Ground (normal z =-1), Wall (normal z=0) and Roof (normal z=1).
+27- Enthusiast
Use the GeoemtryCoercer to a CompositeSurface - Use GeometryPartExtractor to get IFMEFaces - You can then use a PlanrityFilter to extract the surface normals. You can use the surface normals to figure out which is Ground (normal z =-1), Wall (normal z=0) and Roof (normal z=1).
A very good approach - and it works with LoD2 buildings as well, where the roof surfaces are not horisontal. (They will have a surface normal between 0 and 1.)