SSS Bugs and weirdness #36620

New Issue

Thomas Dinges · 2013-08-31T23:01:49+02:00

Thomas Dinges commented

2013-08-31 23:01:49 +02:00

%%%--- Operating System, Graphics card ---
Windows 7 x64, Geforce 540M
SVN 59692 (self build)

- Short description of error ---

Render differences between the two integrators, and bugs in SSS.

- Steps for others to reproduce the error (preferably based on attached .blend file) ---

Hi Brecht,
please see the attached file "SSS_bug.blend" and the attached images. (Mesh from http://www.cggallery.com/)

Note that the file includes a Environment texture (jpg), which seems to be a part of the whole problem.
Also "Compatible" seems fine.

Press F12 and render with both integrators. Compare. See "integrator_difference.jpg. Both rendered with 20AA Samples.

Color is different, this is still there with more samples.

See attached "sss_nose.jpg" This has been rendered with 200 AA Samples (Sub Samples were all set to 1).

Weird artefacts in the nose with Path Trace.
I would expect Branched Path Trace to have less/equal noise levels with same amount of AA Samples.
For Branched Path, I also rendered with 400 AA Samples then, and it looks exactly! the same as with 200 samples.

Disable/Remove the Environment Texture and render again. This looks comparable. (See "without_env_tex.jpg). Rendered with 200 AA samples.
Note that the weird artefacts in the noise (also in other places) are gone, at least I cannot see them here anymore.

Sorry for the long list, but I hope it helps to track down the issue.

%%%

%%%--- Operating System, Graphics card --- Windows 7 x64, Geforce 540M SVN 59692 (self build) - Short description of error --- Render differences between the two integrators, and bugs in SSS. - Steps for others to reproduce the error (preferably based on attached .blend file) --- Hi Brecht, please see the attached file "SSS_bug.blend" and the attached images. (Mesh from http://www.cggallery.com/) Note that the file includes a Environment texture (jpg), which seems to be a part of the whole problem. Also "Compatible" seems fine. 1) Press F12 and render with both integrators. Compare. See "integrator_difference.jpg. Both rendered with 20AA Samples. * Color is different, this is still there with more samples. 2) See attached "sss_nose.jpg" This has been rendered with 200 AA Samples (Sub Samples were all set to 1). * Weird artefacts in the nose with Path Trace. * I would expect Branched Path Trace to have less/equal noise levels with same amount of AA Samples. * For Branched Path, I also rendered with 400 AA Samples then, and it looks exactly! the same as with 200 samples. 3) Disable/Remove the Environment Texture and render again. This looks comparable. (See "without_env_tex.jpg). Rendered with 200 AA samples. Note that the weird artefacts in the noise (also in other places) are gone, at least I cannot see them here anymore. Sorry for the long list, but I hope it helps to track down the issue. %%%

Thomas Dinges commented

2013-08-31 23:01:49 +02:00

Changed status to: 'Open'

Brecht Van Lommel commented

2013-09-01 16:10:54 +02:00

%%%Fix in svn revision 59705, thanks for the report.%%%

Brecht Van Lommel commented

2013-09-01 16:10:54 +02:00

Changed status from 'Open' to: 'Resolved'

Brecht Van Lommel closed this issue

2013-09-01 16:10:54 +02:00

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SSS Bugs and weirdness #36620