Hi @joolek.o​ ,

Please use a BoundsExtractor before the HullReplacer to get the minimum Z of the object, then use a 3DForcer after the HullReplacer to set that value as the Z of the polygon.

Thanks @daveatsafe​ 

I have tried BUT... It's most likely me being an amateur

Please see below:

My overlay is crated based on the TIN from the LAS, When I use Bound Extractor it creates one big for all the objects instead of multiple small ones...

Hi @joolek.o​ ,

OK, it's a little more complex, but you can try the following process:

• assign each hull an unique id with a Counter
• use a Clipper to clip the original point cloud by hulls - enable Merge Attributes in the Clipper
• Use a BoundsExtractor on the clipped point clouds to get their min z
• Use a FeatureMerger (attributes only) to merge the point cloud info onto each hull
• Use a 3DForcer to elevate the hull to the min z merged in from the point cloud