Merge intersecting primitives

General TouchDesigner Discussion
1

I have a bunch of flat primitives. Some of them intersect on an edge:
prims

I have a simple shader that renders a different color per primitive.

Goal: I want to combine primitives that touch each other so they get rendered the same color.

There was an almost-success with the surfsect SOP set to intersection, but it doesn’t seem to output any data that lets me associate the intersecting primitives with each other

surfsect
surfsect808×559 58 KB

BTW, I’m trying to do this procedurally, but only needs to cook once, not every frame (the incoming geometry is static, made from the trace SOP)

3

Did you ever figure this out? I have a similar issue.

4

Looking back on this, I don’t think TouchDesigner has any native tools to handle this operation unfortunately.
In this simplified case though, you may be able to assign a value based on its primitive normal, so all primitives facing the same direction could get the same color.

Cheers,
Rob.