CUDA rendering dissimilar between interactive & progressive

V-Ray for SketchUp V-Ray for SketchUp :: Issues
1

I’ve been using vfs3 pretty exclusively in GPU rendering. With 2 GTX1070’s it’s blazing fast. Unfortunately, there is a significant difference in GPU rendering depending on if interactive is enabled or disabled. Here is a simple dome-lit scene, you can see the difference. The first render is with interactive enabled, the second is GPU progressive rendering. You can see the second rendering is calculating quite incorrectly. I tested the scene in Vray for Blender with GPU rendering just to make sure I was correct in what result I was expecting.

kitchen-view2bIR.jpg
kitchen-view2bIR.jpg1600×900 365 KB

kitchen-view2b.jpg
kitchen-view2b.jpg1600×900 298 KB

kitchen-view2b-blendCUDA.jpg
kitchen-view2b-blendCUDA.jpg1280×720 74.4 KB

interiors-massing3b-test.zip (672 KB)

2

Seems changing GI to BF+BF works to get the correct result. Is LC not working correctly in progressive GPU?

3

Hello Andy,

There’s a problem with the implementation of LC in GPU CUDA rendering. This is a known issue, and Konstantin said it’s already fixed in some internal builds.

best,

Caetano

4

Hello,

Your observations are correct. There was an issue with the render output results when using Light Cache in GPU mode. It has been already resolved and its fix will be part of the next update.

Kind regards,
Peter

P.S. Didn’t see Caecar’s reply until I refreshed the page.. :slight_smile: