Fedor Koleganov

What Tanto said is right. Vellum Source looks at the presence of nextid detail attribute to start incrementing point ids. Unlike POP Source it does not create those attributes by default, requiring some source prep work that isn't documented well. But once detail nextid and point id attributes are present on source points everything else should work.

Intel cards are listed as supported in the System Requirements, OpenCL use should be fine, but I don't have a card myself to check.

Don't try to render them from the same Geometry OBJ. Create 2 Geometry OBJ nodes, use Object Merge to bring your pyro sim in the first Geometry object, then do the same with your polygonal geometry but for the second Geometry Object.