Hey , glad that solution worked for you.
For your other question, I don’t think there’s a way to combine based on materials, so I think the easiest thing to do would be:
- in Cinema 4D CMD+Click (or control+click if you’re on Windows) all the Polygon Selection tags you’d like to combine.
- in your Attributes window you should see something like “Name <<Multiple Values>>”
- Choose “Select Polygons” to select all the polygons associated with those selection tags.
- In the object window delete all the selection tags, then with your polygons still selected, in the main C4D menu go to Select -> Set Selection.
This will create a new polygon selection tag with all those polygons you had selected. Not ideal I’ll admit, but that’s the easiest way I can think of off the top of my head.