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Fix: Cycles: wrong refractive index in path guiding #112157

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Weizhen Huang merged 3 commits from weizhen/blender:fix-path-guiding-eta into main 2023-09-18 16:20:57 +02:00
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Weizhen Huang commented 2023-09-08 19:25:03 +02:00
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should be the relative IOR of the outgoing media to the incoming media,
depending on bsdf->ior and whether the interaction is refraction.
Reference paper: Robust Fitting of Parallax-Aware Mixtures for Path Guiding Eq (35)

should be the relative IOR of the outgoing media to the incoming media, depending on `bsdf->ior` and whether the interaction is refraction. Reference paper: [Robust Fitting of Parallax-Aware Mixtures for Path Guiding](https://uni-tuebingen.de/fakultaeten/mathematisch-naturwissenschaftliche-fakultaet/fachbereiche/informatik/lehrstuehle/computergrafik/lehrstuhl/veroeffentlichungen/robust-fitting-of-parallax-aware-mixtures-for-path-guiding/) Eq (35)
Weizhen Huang added 1 commit 2023-09-08 19:25:13 +02:00
Fix: Cycles: wrong refractive index in path guiding
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should be the relative IOR of the outgoing media to the incoming media,
depending solely on `bsdf->ior` and whether the interaction is
refraction.
Ref: https://uni-tuebingen.de/fakultaeten/mathematisch-naturwissenschaftliche-fakultaet/fachbereiche/informatik/lehrstuehle/computergrafik/lehrstuhl/veroeffentlichungen/robust-fitting-of-parallax-aware-mixtures-for-path-guiding/
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Weizhen Huang commented 2023-09-18 14:09:34 +02:00
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@blender-bot build

@blender-bot build
Weizhen Huang added 2 commits 2023-09-18 14:18:45 +02:00
Use #ifdef instead of #if
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Weizhen Huang commented 2023-09-18 14:19:01 +02:00
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@blender-bot build

@blender-bot build
Weizhen Huang commented 2023-09-18 15:13:08 +02:00
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Hard to say if there is any difference, but in general path guiding seems to have many fireflies.

Before After Before After
pg_before.png pg_after.png pg_before_.png pg_after_.png

I enabled the verification when WITH_CYCLES_DEBUG is defined. There is another discrepancy though, function bsdf_is_transmission() checks with sd->N, but when sampling we check against sd->Ng.

Hard to say if there is any difference, but in general path guiding seems to have many fireflies. | Before | After | Before | After | -------- | -------- | -------- |---| | ![pg_before.png](/attachments/f3933b68-776d-42da-b2a5-8f131d344482) | ![pg_after.png](/attachments/51f74270-32dc-4d17-a8af-ff3b33fc10f5) | ![pg_before_.png](/attachments/cdad9ad2-437a-4dc9-875a-6d6917fb653b) | ![pg_after_.png](/attachments/8edf7971-816c-4b6d-860a-b68144b13bbf) I enabled the verification when `WITH_CYCLES_DEBUG` is defined. There is another discrepancy though, function `bsdf_is_transmission()` checks with `sd->N`, but when sampling we check against `sd->Ng`.
pg_before.png
108 KiB
pg_after_.png
96 KiB
pg_after.png
108 KiB
pg_before_.png
96 KiB
Weizhen Huang commented 2023-09-18 15:14:57 +02:00
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The failed blendfile_library_overrides test doesn't seem to be related to this patch.

The failed `blendfile_library_overrides` test doesn't seem to be related to this patch.
Weizhen Huang requested review from Brecht Van Lommel 2023-09-18 15:15:33 +02:00
Weizhen Huang requested review from Sebastian Herholz 2023-09-18 15:15:40 +02:00
Brecht Van Lommel approved these changes 2023-09-18 15:48:34 +02:00
Weizhen Huang merged commit e894e6a411 into main 2023-09-18 16:20:57 +02:00
Weizhen Huang deleted branch fix-path-guiding-eta 2023-09-18 16:20:58 +02:00
Sebastian Herholz commented 2023-09-23 13:59:25 +02:00
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@weizhen the change look correct.
About the bsdf_is_transmission function, I think the problem is that each closure can have its own shading normal, which makes it it impossible to robustly identify the correct situation if a ray is transmission or not if you do not add an explicit closure to it.

@weizhen the change look correct. About the ` bsdf_is_transmission` function, I think the problem is that each closure can have its own shading normal, which makes it it impossible to robustly identify the correct situation if a ray is transmission or not if you do not add an explicit closure to it.
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Reference: blender/blender#112157
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