Rhino 8 small bug raytrace bug

  1. does anyone else have a in viewport raytracing issue where the GPU will not engage and you get a CPU fallback note?

Im running RTX A4000 card btw windows 11 rhino 8.5.24072.13001

That isn’t a bug, that is expected behavior when Rhino is compiling the GPU kernels.

In Tools > Options > Rhino Render check the compile log with the button under the render device tab page.

If you see errors in there you can hit the recompile kernels button. It takes a couple of minutes for the compile to complete. The dots after each device should turn green eventually.

Make sure you have latest driver for your GPU installed.

Thank you NatKing… drivers drivers drivers… its should have been the first thing I did, sorry.