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cant find Physical Lens Shader node April 21, 2024, 1:27 p.m.

It's probably a bit confusing when trying this for the first time.

You create the Karma Physical Lens not in a material library, but a Material Network.

So put down a material network on /stage or in your lopnet, dive inside, and then you can find it in the Tab-menu.

XPU stopped working after Houdini upgrade (605 to 653). April 15, 2024, 3:28 p.m.

I can reproduce some sort of problem.

When using XPU in .653 using nvidia 550.54.14 on Linux (not debian though), I get 100% embree only, no optix.
It renders, just CPU-only. So there is something up.

How to make a clean uv grid out of this? April 14, 2024, 8:07 a.m.

If (only if, though) your ordering is guaranteed, you can treat it as a mesh. ConvertSOP set to mesh, then a UvtextureSOP with the type parameter set to "Rows & Columns", then ConvertSOP back to polygons.

This should do it, for this special case.