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Maniphest T55765

Volume equiangular sampling too noisy
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Description

The final result of a smoke render differs if using GPU (NVIDIA 1050 Ti) or using CPU (AMD 1300X).

CPU render - Volume sampling 0.1 - Volume bounces: 0
https://i.stack.imgur.com/2dg9h.png

CUDA render - Volume sampling 0.1 - Volume bounces: 0
https://i.stack.imgur.com/nB7qw.png

Having tests I found it out that it is something related to the volume sampling. Decreasing the value solves partially the problem for the CPU so it becomes nearly the one obtained with the GPU but... there still are enormous differences.

No settings have been touched from render to render.

CPU render - Volume sampling 0.01 - Volume bounces: 15
https://i.stack.imgur.com/a7CIF.jpg

CUDA render - Volume sampling 0.01 - Volume bounces: 15
https://i.stack.imgur.com/h2tYZ.jpg

BLENDER VERSIONS TESTED:

ARCH LINUX:
17:2.79.b.git3.32432d91-1 from the arch's repository.
2.79b official
2.79-c9608047472 experimental official
2.80-405c6c077f6 experimental official

in the 2.8 I can't bake so can't actually test... Is maybe the smoke simulation still under development?

BLEND FILE ATTACHED:

fumi-in-live.blend579 KBDownload

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Event Timeline

Francesco Yoshi Gobbo (FraYoshi) created this task.Jul 4 2018, 11:26 PM
Francesco Yoshi Gobbo (FraYoshi) updated the task description. (Show Details)Jul 4 2018, 11:29 PM

modified in order to not include the mentioned task but it remains mentioned, sorry about that ^^"

Brecht Van Lommel (brecht) claimed this task.Jul 5 2018, 11:24 AM
Brecht Van Lommel (brecht) lowered the priority of this task from 90 to 50.
Brecht Van Lommel (brecht) added a subscriber: Brecht Van Lommel (brecht).

Only the CPU supports equiangular and multiple importance volume sampling, and that's where the issue seems to be. Workaround is changing the volume sampling to distance in the material properties settings panel.

Brecht Van Lommel (brecht) renamed this task from CPU render result differs from CUDA's one on smoke to Volume equiangular sampling too noisy.Jul 5 2018, 11:24 AM
Dalai Felinto (dfelinto) removed Brecht Van Lommel (brecht) as the assignee of this task.Dec 23 2019, 4:36 PM
Dalai Felinto (dfelinto) added a project: Tracker Curfew.
Brecht Van Lommel (brecht) edited projects, added Render & Cycles; removed Tracker Curfew, Render Pipeline.Feb 11 2020, 9:23 AM
Brecht Van Lommel (brecht) changed the subtype of this task from "Report" to "Known Issue".
Thomas Dinges (dingto) closed this task as Resolved.Nov 24 2022, 4:18 PM
Thomas Dinges (dingto) claimed this task.
Thomas Dinges (dingto) added a subscriber: Thomas Dinges (dingto).

Cannot confirm this anymore, CPU render looks fine and Equi Angular Sampling is supported on the GPU now as well.