I created the grid, but I don't know which transfo I should use to clip the objects (clipper doesn't seem to be the correct one).
Thanks in advance!
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Yes, FME can't clip surface geometries unfortunately. You will need to convert the surfaces into polygons (GeomeryPartExtractor). Once you have the polygons you can try clipping them.
The clipper also doesn't work so good on verticle objects like building walls.
If you are starting with solid geometries you might be able to clip a solid against another solid. This means that you can try extruding the grid into 3D blocks and using these are the 'Clippers'. This is just an idea really, I haven't tried this process.