Vray Light Gen Not Working Today

They restarted 3ds Max. Reset the scene. Tried "Morning." Same thing. The dome light stayed stubbornly black.

Panic.

This is a frustrating moment for any 3D artist. Let me tell you a short, relatable story about this exact problem, then give you the most likely fix. vray light gen not working

That was it.

Alex thought, "No problem. I'll use V-Ray Light Gen. Click a preset. Done." They restarted 3ds Max

V-Ray Light Gen, in some versions, fails to write temporary HDRI preview files to a path containing a space. It silently fails. No error. Just a dead, dark dome. relatable story about this exact problem

Twenty minutes later, after sweating through the fix, Alex had a beautiful golden sunset. They delivered on time. But they never forgot: check the damn path spaces.