Hi!

I used a group sop to get the unshared edges (edges group). Lower in my nodes setup I don't have access to that edges group anymore. When I check the spreadsheet, I can't see any information about that group. Even the group node doesn't seem to have it in the spreadsheet.

How is it stored? I need to transfer that group lower in my node setup.

-Olivier

A wee bit late to the party but I thought I'd reply anyway, in case anyone else ever googles this. It's stored as an Intrinsic Attribute. Intrinsics are kinda tucked away by Houdini (and also not that easy to interact with) but you can at least check them. Just click the dropdown that says "Intrinsics" in the Geometry Spreadsheet. They exist for Primitive and Detail-attributes.

olivierth
Hi!

I used a group sop to get the unshared edges (edges group). Lower in my nodes setup I don't have access to that edges group anymore. When I check the spreadsheet, I can't see any information about that group. Even the group node doesn't seem to have it in the spreadsheet.

How is it stored? I need to transfer that group lower in my node setup.

-Olivier

Hi,

You can't inspect edge groups inside the geometry spreadsheet, as edges are not first-class types in Houdini. You can see the edge groups as a list by inspecting the detail intrinsic attribute called edgegroups.

Not all nodes in Houdini preserve edge groups — for example, the Subdivide SOP will destroy existing edge groups. So you’ll need to identify which node in your network is doing this, and try to preserve the group yourself, possibly by writing some VEX code.

It comes down to the algorithm used by the node — in some cases like Subdivide, you can track the resulting edges and figure out which ones originated from edges in your group.