Yunus Balcioglu

Hi,

If you are not on macOS, fullscreen is not officially supported:
https://www.sidefx.com/docs/houdini/news/19_5/viewport.html [www.sidefx.com]

But there are workarounds using Python Qt which I use successfully for years:
https://www.sidefx.com/forum/topic/53236/ [www.sidefx.com]

You can see fullscreen in action here:

Polar Inversion COP [www.patreon.com]

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,

You can solve it numerically using SVD (singular value decomposition):
https://www.sidefx.com/forum/topic/84345/#post-364636 [www.sidefx.com]