Differences in render passes progressive/non-progressive #33838

New Issue

Filip Sauer · 2013-01-11T18:01:33+01:00

Filip Sauer commented

2013-01-11 18:01:33 +01:00

%%%--- Operating System, Graphics card ---
windows 7, 64 bit, NVIDIA GeForce GTX 285

- Blender version with error, and version that worked ---

2.65.8 r. 53 729, tested also in official 2.65a

- Short description of error ---

If I render separate passes with progressive and non progressive integrator I get differences. On a side note - as far as I can compare, I should get the same results with noise (mesh emitter, no background MIS, all samples in non-progressive set to 1) and same amount of passes, but still I get better result with non-progressive, but that's probably the result of differences in passes.

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

Just render the attached scene first with progressive and then without it and see the difference in passes. It should work with pretty much any scene with glossy and transparent shaders. I marked some of the most visible differences in the attached image.

%%%

%%%--- Operating System, Graphics card --- windows 7, 64 bit, NVIDIA GeForce GTX 285 - Blender version with error, and version that worked --- 2.65.8 r. 53 729, tested also in official 2.65a - Short description of error --- If I render separate passes with progressive and non progressive integrator I get differences. On a side note - as far as I can compare, I should get the same results with noise (mesh emitter, no background MIS, all samples in non-progressive set to 1) and same amount of passes, but still I get better result with non-progressive, but that's probably the result of differences in passes. - Steps for others to reproduce the error (preferably based on attached .blend file) --- Just render the attached scene first with progressive and then without it and see the difference in passes. It should work with pretty much any scene with glossy and transparent shaders. I marked some of the most visible differences in the attached image. %%%

Filip Sauer commented

2013-01-11 18:01:33 +01:00

Changed status to: 'Open'

Thomas Dinges commented

2013-01-12 14:12:21 +01:00

%%%Hi,
I experienced the same before, this is indeed interesting.
I am not exactly sure though if this is a bug, the final image converges into the same result.

The difference in the passes could be related to the different sampling techniques. What do you think Brecht? %%%

%%%Hi, I experienced the same before, this is indeed interesting. I am not exactly sure though if this is a bug, the final image converges into the same result. The difference in the passes could be related to the different sampling techniques. What do you think Brecht? %%%

Brecht Van Lommel commented

2013-01-12 22:20:21 +01:00

%%%The difference in noise is intentional, this is because the non-progressive integrator will sample all light sources once for each AA simple, rather than picking a single light source as the progressive integrator does.

The passes are indeed wrong though, will look into a fix.%%%

%%%The difference in noise is intentional, this is because the non-progressive integrator will sample all light sources once for each AA simple, rather than picking a single light source as the progressive integrator does. The passes are indeed wrong though, will look into a fix.%%%

Brecht Van Lommel commented

2013-01-15 20:06:07 +01:00

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

Brecht Van Lommel commented

2013-01-15 20:06:07 +01:00

Changed status from 'Open' to: 'Resolved'

Brecht Van Lommel closed this issue

2013-01-15 20:06:07 +01:00

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Differences in render passes progressive/non-progressive #33838