Note that this SOP is non-compilable and its utilization may be computationally heavy, so an alternative may be to use the Copy To Points SOP, which is more performance-optimized and is compilable.

Once attributes are assigned within the Copy SOP, the following HScript expression can be used by upstream nodes to retrieve the mapped local variable for stamping operations..

These are the primitives intended to be instantiated via the Copy Stamp SOP. The variables and attributes defined within the Copy Stamp SOP can be referenced in this incoming stream to vary parameters on a per copy basis.

This is the template for point positions that also carry specified attributes to associate and define the copy instances for each of them once these points have been processed through the Copy Stamp SOP.

The value defined in this parameter is referenced by the local variable $NCY.

Attributes directly from the template points incoming through Input 2. In lieu of this, point attributes can also be mapped to local variables and input in the Variable parameter/s below.

Local variables that are to be associated with the copy instances are specified here using the local variable notation ($localvariable). As noted above, incoming template point attributes can be input here only once they have been mapped for use as local variables, such as through one of the following methods:

Reference: https://www.sidefx.com/docs/houdini/nodes/sop/copy.html