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thanks this fixed my issue!

https://www.patreon.com/posts/polar-inversion-159637654 I have been experimenting with Houdini’s new Copernicus network and started porting some of my existing COP tools into custom OpenCL COP nodes. The first one is a Polar Inversion filter implemented directly as an OpenCL COP node. The core mapping is based on radial inversion around a center point: scale = radius² / distance² In practice, the important part is not the formula itself, but making it stable and usable as an image filter. The implementation uses inverse mapping, where each output pixel traces back to the corresponding source position. Near the inversion center, the denominator is clamped using a pixel-footprint floor, with an optional softness floor. This avoids the unstable singularity you would otherwise get from dividing by a near-zero distance. For sampling, the node uses deterministic subpixel supersampling and Houdini’s rectangular filtered sampling through "imageSampleRect". The filter footprint is currently based on the output pixel footprint, which gives better reconstruction than a naive point lookup while still remaining predictable and fast. This is the direction I want to take with Copernicus: converting my existing COP nodes and implementing more advanced image filters, compositing operators, and procedural transformations that are not currently available in Houdini. The goal is to build a deeper image-processing toolset inside Houdini, using the same philosophy I use in my VEX work: low-level control, practical performance, and tools designed around real production needs.

Hi everybody I hope you are having a lovely Friday so far. I don't know if this is the right channel to post questions but there is this great tutorial from Entagma on how to do a paint stroke. Great! But how would you approach if you need to add a brush interacting, like a brush doing the paint brush stroke. Would you use a vellum hair sim on the hair of the brush interacting with the viscous Flip solver simulation. Is it possible to mix vellum and flip solvers? Thanks   https://www.youtube.com/watch?v=8TvAe3GxNFs&t=17s

Particles and Anticipation. Have Fun . proc09.h

Thanks for the tips! gonna check that out, thanks again for taking time to help me!