Copying meshes to their own polygons using VEX.
The mesh is copied multiple times based on the number of the polygons of the target mesh. The copy node creates an individual copynum-attribute which is used to ad.
vector bb = relbbox(0, v@P).zxy;
int copy = prim(0, 'copynum', i@primnum);
vector pos = primuv(1, 'P', copy, bb);
vector nml = prim_normal(1, copy, bb);
float area = primintrinsic(0, 'measuredarea', copy);
v@P = pos + nml * bb.z * sqrt(area);
v@Cd = bb;
