i was working on an project recently, where i wanted to bake the ambient occlusion of some rocks, distributed by forest pack to a plane, using mental ray.
Sadly i had no luck, mental ray stated this error message: PHEN 0.9 383 MB error: Render to Texture: Failed to create acceleration structure (unkown error).
Tried the following steps, to narrow down the issue:
- renderering an AO pass through the camera with an occlusion material as a global overrider which gives a nice occlusion picture of the rocks and plane
- rendering with a standard material as an overrider - no luck same error
maby someone run into a simmilar issue and can give me some clues on how to get this issue fixed....
best regards, an greetings from vienna ...