i'm not quite clear on what your end goal is. can you restate?

I am using coordinates to control some particles. I would like the particles to be limited to the ellipse shape I have created in jit.gen, but this was turning into a shader thing(and was too complicated for me to accomplish) So I thought I could just create a simple ellipse mask, but what I am tracking is close to the edges of the frame so I was trying to keep the tracking coordinate inside the ellipse.

I though I could do this is in gen by putting the coords in a matrix and cliping or sampling the mask, but wasn't having luck. I then heard that this could be accomplished with cartopol or by again by shaders.

While I work out the basics I am using mouse coordinates from jit.world, but I intend to use CV or color tracking in the end.

sorry heres a patch updated, using cartopol in gen. This is as close as I've got.