The title says it all.
When I render a 3D scene in Photoshop CS6, is the GPU of my system of any help?
Whenever I render any 3D scene in PS, I have noticed that the GPU stays idle, it does nothing, everything seems to be done by the CPU. Is it supposed to be this way?
OpenGL _is_ correctly enabled in PS and I have just one video card in my system (GTX660 Ti 3GB).
I'm not totally sure on this, but I think the rendering uses CPU as it has to calculate all the raytrace elements, which may be beyond the ability of the GPU. Plus once you rendered, you can save the file and it will keep the rendered state until you make a change, so that sounds like the CPU saving file info to disk. The GPU is mainly for updating the display quickly and giving you a close representation of what you'll be getting, like light and shadow movement.
There are free GPU monitors you can download they would show any activity.
The Render command invokes ray tracing which does not use the GPU. You are seeing expected behavior.