Copy SOP Identify Verts of a copy in the vertex shader

Hi there!

Is it possible to achieve the equivalent of TDInstanceID() with Copy SOP? Say I use five points as a template and a rect for the copy data. Can I know in my vertex shader which rect I am processing at that moment?

I assume from the attributes page, I can add some attribute to help with this, but I’ve no idea what I need to put in that page to acheive it.

Any help would be much appreciated!

All the best,
Jayson