I tried trimming my mesh in WIP 7 and found the texture material was not recognized.
The Material tab shows the same information in both Rhino 6 and WIP 7:
but the Python script which checks for this material in Rhino 6:
Found 499,866 textures with source_mat = 1
fails in WIP 7 reporting:
No textures found source_mat = -1
Should I be using a different test in WIP 7?