What does SOP_Node::select() do

[whisperwing]

In my custom SOP_Node I want to simulate "highlight faces/vertex/edge" as what Houdini provides in the UI in selection mode. There are a set of SOP_Node::select() functions that seem to be relevant, but when I tried the example SOP_CopRaster it doesn't seem like anything is selected. Does anyone have an idea what select() actually does, or have any suggestion on alternative ways to simulate highlights?

My workaround is to create a primitive group or a point group and add the elements I want to highlight, which works fine(middle mouse click on the SOP will show this group).

GA_PrimitiveGroup *faceGrp = gdp->newPrimitiveGroup("FaceGrp", 0);

GA_PointGroup *ptGrp = gdp->newPointGroup("PointGrp", 0);

But for edge group, I tried

GA_EdgeGroup *edgeGrp = gdp->createEdgeGroup("EdgeGrp");

and

GA_EdgeGroup edgeGrp = GA_EdgeGroup(*gdp, "EdgeGrp", 0);

Neither will show when middle mouse click on the SOP even though the group entries is non-zero. Anyone has experience with this?

Thanks!

[edward]

Edge groups are really new and so full support for them isn't there yet.

[whisperwing]

Yeah, I see it is new in 12.1, so this is not the real problem here. I'm more interested to see if anyone could give me a hint on how to implement "highlighting" with HDK.