Hi I am a noob starting Houdini so forgive me if my questions don't make sense. I am trying to learn.

I have used copytopoints to place boxes then I have a attribute wrangler selecting some primitive on those boxes.
I would like to remove the boxes that I have a selected primitive for, but I don't know how to derive the other primnum form the primitive I have selected... Does that make sense ?

Hi,

You can use Group Expand SOP to flood fill the geometry using your prim group.

If one wanted to not use groups for any reason, and modifying the copy template was allowed, one could do the following:

- Give the target points an attribute, for example derived from their point number or a random one
- Do the copy, all the points of the specific copy will inherit that attribute from the template point
- After the copy SOP, promote the attribute from point to primitive
- Now after selecting your primitives, delete all those others that have the same attribute values as the selected ones

More complicated, but valid for some scenarios. I guess there are now only 900 other ways left