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Fix: Cycles spot light spread sampling not considering non-uniform scaling #119661

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Weizhen Huang merged 2 commits from weizhen/blender:fix-spot-light-non-uniform into main 2024-03-19 18:55:44 +01:00
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Weizhen Huang commented 2024-03-19 15:02:55 +01:00
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For spherical spot light without Soft Falloff, when the shading point is
close to the light source, we switch to sampling the light spread instead
of the visible cone from the shading point. This has the benefit of less
noise when the spread is small.
However, the light spread sampling was not considering non-uniform
object scaling, where the actual spread might be different.
This patch switches sampling method only when the smallest enclosing
spread cone is smaller than the visible cone from the shading point.

An alternative method would be to compute the actual solid angle of the
scaled cone, and sample from the scaled cone. However, that involves
ray transformation and modifying the sampling pdf and angle. Since
non-uniform scaling is rather a niche case, it's probably not worth the
computation effort.

Before After
before.png after.png
For spherical spot light without Soft Falloff, when the shading point is close to the light source, we switch to sampling the light spread instead of the visible cone from the shading point. This has the benefit of less noise when the spread is small. However, the light spread sampling was not considering non-uniform object scaling, where the actual spread might be different. This patch switches sampling method only when the smallest enclosing spread cone is smaller than the visible cone from the shading point. An alternative method would be to compute the actual solid angle of the scaled cone, and sample from the scaled cone. However, that involves ray transformation and modifying the sampling pdf and angle. Since non-uniform scaling is rather a niche case, it's probably not worth the computation effort. | Before | After | | -------- | -------- | | ![before.png](/attachments/bbc2b509-6b4f-45ab-961c-fcd54b68c987) | ![after.png](/attachments/7257ccad-f12d-4e02-852d-633c671b239c) |
before.png
61 KiB
after.png
67 KiB
Weizhen Huang added 2 commits 2024-03-19 15:03:04 +01:00
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39b62f53bc Fix: Cycles spot light spread sampling not considering non-uniform scaling 
For spherical spot light, when the shading point is close to the light
source, we switch to sampling the light spread instead of the visible
cone from the shading point. This has the benefit of less noise when the
spread is small.
However, the light spread sampling was not considering non-uniform
object scaling, where the actual spread might be different.
This patch switches sampling method only when the smallest enclosing
spread cone is smaller than the visible cone from the shading point.

An alternative method would be to compute the actual solid angle of the
scaled cone, and sample from the scaled cone. However, that involves
ray transformation and modifying the sampling pdf and angle. Since
non-uniform scaling is rather a niche case, it's probably not worth the
computation effort.
Weizhen Huang added the
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Render & Cycles
 label 2024-03-19 15:03:20 +01:00
Weizhen Huang changed title from fix-spot-light-non-uniform to Fix: Cycles spot light spread sampling not considering non-uniform scaling 2024-03-19 15:05:02 +01:00
Weizhen Huang commented 2024-03-19 15:05:51 +01:00
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@blender-bot package

@blender-bot package
Blender Bot commented 2024-03-19 15:05:55 +01:00
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Package build started. Download here when ready.

Package build started. [Download here](https://builder.blender.org/download/patch/PR119661) when ready.
Weizhen Huang commented 2024-03-19 17:33:11 +01:00
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@brecht do you want to review this?
The first commit is cleaning up, wanted to test together if they build on other platforms, not sure what that "AppleEvent timed out" means.

@brecht do you want to review this? The first commit is cleaning up, wanted to test together if they build on other platforms, not sure what that "AppleEvent timed out" means.
Brecht Van Lommel approved these changes 2024-03-19 18:22:17 +01:00
Brecht Van Lommel left a comment
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Looks good.

Not sure what is going on with that timeout, unrelated to this PR in any case.

Looks good. Not sure what is going on with that timeout, unrelated to this PR in any case.
Weizhen Huang merged commit a2bb547b9a into main 2024-03-19 18:55:44 +01:00
Weizhen Huang deleted branch fix-spot-light-non-uniform 2024-03-19 18:55:47 +01:00
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