VEX in group expression vs VEX in attribute wrangle

[karen]

in attached hip file, I'm trying to group meshes that have only 6 primitives.

When I use a wrangle it works: if (@numprim<=6) @group_grp1=1;

when I use a group expression it doesn't: @numprim<=6

I'd like to be able to use group expression as well, what should I change?

group_expression.hiplc

[haggi]

It doesn't work because you do not apply the group expression to connected prims. In your loop the wrangle node is applied to a set of connected primitives and calculates the @numprim for this set whereas in the group expression node, you only have a static @numprim count. Just replace the wrangle with the group expression and it should work.