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How to cut roof polygons from dormer which are inside the main roof?

limo
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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)?

Best answer by daveatsafe

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.

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    2 replies

    daveatsafe
    Safer
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    • daveatsafeSafer
    • Safer
    • Best Answer
    • October 19, 2022

    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.

    limo
    Supporter
    Forum|alt.badge.img+8
    • limoSupporter
    • Author
    • Supporter
    • October 20, 2022

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

    image

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