LuxCoreRender 2.2 beta 1, build 004d2aa
Today, I noticed there can be a big difference in color and brightness if PGIC is enabled compared to disabled.
Please look at the image, they have both the same fixed tone map settings (Reinard).
Why is the render darker with PGIC? What happens to the energy?
Talking about Reinard ... Did anyone else notice that preview in viewport and final render do not have the same brightness?
Why does Reinard take some dozen samples to stabilize its brightness?
Why is image with PGIC darker than without?
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Please upload a testscene that allows developers to reproduce the problem, and attach some images.
Please upload a testscene that allows developers to reproduce the problem, and attach some images.
- FarbigeWelt
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Why is image with PGIC darker than without?
Light and Word designing Creator - www.farbigewelt.ch - aka quantenkristall || #luxcorerender
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MacBook Air with M1
Re: Why is image with PGIC darker than without?
Without any information about material types,light sources, cache type and/or a test scene, it is hard to say.
Have you tried with linear tone mapping ? Reinard is dynamic like auto linear tone mapping.FarbigeWelt wrote: ↑Tue Jun 11, 2019 4:58 pm they have both the same fixed tone map settings (Reinard).
- FarbigeWelt
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Re: Why is image with PGIC darker than without?
I did not know that Reinard is dynamic too. Best is in this case to re-render with linear but without auto brightness.Dade wrote: ↑Tue Jun 11, 2019 9:49 pm Without any information about material types,light sources, cache type and/or a test scene, it is hard to say.
Have you tried with linear tone mapping ? Reinard is dynamic like auto linear tone mapping.FarbigeWelt wrote: ↑Tue Jun 11, 2019 4:58 pm they have both the same fixed tone map settings (Reinard).
The materials are a mix of glass 95% and matte 5%.
There are three area lights and the sun with sky.
Light and Word designing Creator - www.farbigewelt.ch - aka quantenkristall || #luxcorerender
MacBook Air with M1
MacBook Air with M1
- FarbigeWelt
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Re: Why is image with PGIC darker than without?
Please have a look at the attached scene. Meanwhile yes, please have a look at the two pictures. Objects are darker with PGIC, indirect plus caustic cache, than without. Sky background seems to have the same brightness. Do you have any ideas why PGIC is darker?
Light and Word designing Creator - www.farbigewelt.ch - aka quantenkristall || #luxcorerender
MacBook Air with M1
MacBook Air with M1
Re: Why is image with PGIC darker than without?
Have you tried increasing the depth of PGI?
On phone now, but IIRC that was a property. Your problem looks like glass with a too small path depth
On phone now, but IIRC that was a property. Your problem looks like glass with a too small path depth
Re: Why is image with PGIC darker than without?
It is a damn AMD compiler bug, the same code works fine with NVIDIA GPU. I have tracked down the problem and the AMD code just doesn't write a value to the requested location; I will try to find a workaround but it may be not even possible.
Re: Why is image with PGIC darker than without?
Why AMD driver seem to encounter so much little issue while being opencl only compute oriented while nvidia do both cuda/opencl and seem to work seamlessly ?
Re: Why is image with PGIC darker than without?
The Nvidia compiler has its fair shair of problems as well ...
Re: Why is image with PGIC darker than without?
I have found a ways to workaround the problem and now the scene should work fine on AMD GPUs too.