Hi @anderssonaxel 

This would be my first approach

Jasper

Alternatively, you could use a PointCloudCombiner to collect all draped points from the SurfaceDraper in a new point cloud and export it as a LAS file.

Next, import in CloudCompare the original and the draped point cloud and calculate a Cloud/Cloud distance plot. Then you will have a nice visualisation.

@jasperwis Thank you! It does what I wanted now. So when I input a surface into the surface draper it uses that one instead of creating a new one? That was where I got stuck because I need to keep the model generated in TINGenerator.

@anderssonaxel 

I had no TIN file available, so I used a TINGenerator to create a sample TIN.

For your use case, just ignore the TINGenerator, import your TIN surface directly in FME and send it to Points/Line port of the SurfaceDraper.