Hi!

I'm one of those former XSI hobbyists moving to the world of Houdini. So I did set up myself with an exercise that involves a set of points in a grid, which have a set of attributes that involves in time (that's the sim part) and that are used as stamped parameters to drive some simple geometry.

Now to do that, I first setup a grid, set some preliminary attributes on those, then feed that in the POP node. I have those in a POP node so that now I can have a simulation so that each node evolves based on the value of its neighbors using an Inline VEX code.

So more or less I got that going, but I see that out of the POP I get twice the number of points. Since I am stamp copy based on those points, I'd like to avoid that. Any idea what I am doing wrong?

(Or if I am approaching this totally the wrong way :roll: ).

See the attached annotated screen capture.

Thanks!

Claude

The particles are being duplicated because the POP Source node is being solved twice, because the source node is being connected to both the POP Solver, and (through POP VOP) to multisolver again. The “particles” are represented by the “emptyobject”. So as long as both popsolver and popvop are attached to that object, they'll be solving the same particles. You don't need to connect the source node to both popsolver and popvop. So to fix the duplication, simply disconnect the source node from popvop.

You could also connect POP VOP into the post-solve input of the POP Solver, instead of needing the multisolver node. Sourcing nodes are also usually connected to the post-solve. So you could merge both POP Source and POP VOP together, and connect the merge into the post-solve.

Another possibility is to chain the POP Source and POP VOP together. There's a lot of flexibility in how you connect them together.