Chaos Corona Forum
Chaos Corona for 3ds Max => [Max] Bug Reporting => [Max] Resolved Bugs => Topic started by: maru on 2013-09-04, 10:55:58
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Again, I'm not sure if it's a bug. Rendered the same region with two setups:
1. Progressive, PTS: 100, passes: 4
2. Bucket, PTS: 100, initial samples: 4
If I understand it correctly, for path tracing this would mean 100 rays per pixel x 4 passes = total 400 samples.
And for buckets, 100 rays sampled 4 times for each pixel = total 400 samples.
I thought the image should look the same and render with same speed. It looks exactly the same, but rendering time is much longer.
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you set adaptive steps to 0, right?
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What is adaptive steps?
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Another one. Progressive: 400 pts x 1 pass. Bucket: 400 pts x 1 initial sample.
btw, it's Sep 3 2013 00:00:50
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just printscreen the settings ;)
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here you go
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ok, you are comparing something entirely different (adaptive buckets to nonadaptive progressive rendering), so the comparison makes no sense. There is no reason for the two times to be the same
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How is this adaptive for buckets if there is only one pass?
And if so, then why these two images look the same in terms of quality?
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you have "passes" set to 10. I've just tried with 1 and it works as expected. Just send the scene ;)
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I have passes set to 10 but completing 1/4 of the first pass took much longer than rendering the whole region in progressive mode. I can upload simplified version of this scene later.
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do it
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Ok, looks like HD cache is the cause of this. Without HD cache both images render with exactly the same time. After enabling HD cache, progressive rendering becomes faster and bucket rendering becomes significantly slower.
I added those objects around lights to make the lighting less "uniform" but it also works with regular lights.
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Hi maru
I tried the scene while maintaining your configuration
the final image I will be too bright
It 's normal?
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Mmm.. interesting test!
In fact, usually I prefer bucket (better quality and little adaptive sampling) and I found Bucket mode slow.
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Hi maru
I tried the scene while maintaining your configuration
the final image I will be too bright
It 's normal?
If you didn't change any settings, this means you have wrong gamma configuration in Max.
In fact, usually I prefer bucket (better quality and little adaptive sampling) and I found Bucket mode slow.
Yes, in theory adaptive buckets MUST be more efficient than non-adaptive progressive rendering. But it looks like there is some bug with HD cache which is affects rendering speed in more complex scenes. It's exceptionally visible when you're rendering something for school on a cheap laptop and after whole night you end up with noisy images. ;)
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I'll do some research about this problem ;-)
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Ok, but remember that I did this test with extreme values just to verify if there is such problem. In normal, more balanced situations this may be unnoticeable.
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Hi maru
Mx2014 - default Gamma 2,2
This value is correct?
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Default Gamma 2,2
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Only if I change the value of the light intensity from 50 to 1.0 mi looks like the render
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Visible directly disabled
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Looks like your lights have different size than mine. What Corona version are you using? Also, check gamma/lut settings.
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Ok, looks like HD cache is the cause of this. Without HD cache both images render with exactly the same time. After enabling HD cache, progressive rendering becomes faster and bucket rendering becomes significantly slower.
I added those objects around lights to make the lighting less "uniform" but it also works with regular lights.
are you tested this with alpha 5 or only with daily build
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With daily build. Bucket rendering works different it a5. Or at least has different names for parameters. ;)
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Looks like your lights have different size than mine. What Corona version are you using? Also, check gamma/lut settings.
Hi maru
Alpha5 of June, the max2014 is only the value Gamma 2,2 (see image)
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There have been changes done to the lights in daily build, it's probably the cause of your problems...
Keymaster, why are you not writing anything here!!!
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Hi maru
Where can I find the input/output gamma in Mx2014?
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what does the lights look like in viewport? It is possible that they need to be rescaled when moving between daily builds and A5
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The lights are not important here. Rafpug has problems because of different Corona version.
What about slow buckets with HD cache?
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Hi maru
Unfortunately there is something in the operating system that stops me access to the daily build.
For now, use the v.5 of June
Thanks
Raf
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fixed
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Thank you! I want to believe in buckets!