How can I select a specific group of faces for Poly Extrude

[carl45456]

Hello, 

I am trying to extrude faces of a mesh depending on it's prim number, I tried to do it in the "Group" parameter, but it's not working.
 

Any help is appreciated!

[oneXone]

One solution is to place a primitive wrangle before your polyextrude and use it to create a group based on primnum. Like this:

if(@primnum>100) i@group_extruders = 1;

Then direct the polyextrude to the "extruders" group.

 

I'm not sure why your solution doesn't work though.

[Fenolis]

You can add the prims to a group using a Primitive Wrangle like:

if(@primnum>100)
  @group_extrude = 1;

then in the PolyExtrude's Group field pick "extrude".

You can extend the functionality by replacing "100" with:

chi("threshold")

and then clicking the sliders icon on the right side of the textbox in the wrangle to create a parameter.