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We have digitized some roofs with dormers.

Now during the creation process the dormers were digitized into the main roof to avoid gaps. Unfortnatley there were no snapping used.

For example:

imageIs there a way in fme to cut these roof polygons from dormers which are inside the main roof (blue line)?

Hi @limo​,

In FME 2022 and up, you can use an Extruder transformer to extrude the roof polygons into solids. Set the Direction to Vertical and the Distance to the negative of the Z range of the polygon. Use the resulting extrusions to clip the roof polygons with a Clipper.

thanks @daveatsafe​ ! This is working for me. The inner roof surfaces are cut off:

image

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