Smoke sampling difference on GPU. #47777
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Sergey Sharybin
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Reference: blender/blender#47777
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W7 FX220(screen) GTX 970(rendering)
Broken: 2.77RC2
1e1118eWorked: new feature "smoke on GPU"
I get a weird difference in rendering smoke switching from CPU to GPU. It seems that GPU needs much more samples/pixel to get rid of noise resulting in longer rendering times greatly exceeding CPU rendertimes. I would expect the other way around.
See Pictures for result and sample settings.
The only difference in settings is switching CPU to GPU and the tile size being 1616 on CPU and 256256 on GPU (tilesize only affects rendertimes). The rendertime of the GPU is half of the CPU but the noise on the GPU is realy bad compared to CPU. I would expect exact same result.
PS: to all blender devs in the world : Love to you all for this amazing software! :)
Changed status to: 'Open'
Added subscriber: @MinneDanhieux
Added subscriber: @mont29
Sounds a bit odd indeed, Cycles team should know better.
Added subscribers: @ThomasDinges, @MartijnBerger, @LukasStockner
Changed status from 'Open' to: 'Archived'
CPU uses Decoupled Ray Marching and improved sampling (Equi-Angular). That code is not ported to GPU yet. It's a todo.
Thanks for the report, but archiving for now.
Ok, it's not even a real bug! That's good news. Can't wait for the full port. Peace for now.