Caustics Shadows Artifacts #97054

New Issue

Shady Hamza · 2022-04-05T03:51:48+02:00

Shady Hamza commented

2022-04-05 03:51:48 +02:00

System Information
Operating system: Windows-10-10.0.22000-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 2060 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 512.15

Blender Version
Broken: version: 3.2.0 Alpha, branch: master, commit date: 2022-04-04 23:42, hash: 1d86d61782
Worked: (newest version of Blender that worked as expected)

Short description of error
Enabling Caustics Shadows Produce Artifacts like weird shapes and irregular border shadows, let me know if I'm missing Something, Thank you

Test.blend

Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]
[Based on the default startup or an attached .blend file (as simple as possible)]

**System Information** Operating system: Windows-10-10.0.22000-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 2060 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 512.15 **Blender Version** Broken: version: 3.2.0 Alpha, branch: master, commit date: 2022-04-04 23:42, hash: `1d86d61782` Worked: (newest version of Blender that worked as expected) **Short description of error** Enabling Caustics Shadows Produce Artifacts like weird shapes and irregular border shadows, let me know if I'm missing Something, Thank you ![01.png](https://archive.blender.org/developer/F12972149/01.png) [Test.blend](https://archive.blender.org/developer/F12972154/Test.blend) **Exact steps for others to reproduce the error** [Please describe the exact steps needed to reproduce the issue] [Based on the default startup or an attached .blend file (as simple as possible)]

Shady Hamza commented

2022-04-05 03:51:48 +02:00

Added subscriber: @Shady.Hamza

Alaska commented

2022-04-05 05:39:28 +02:00

Added subscribers: @olivier.fx, @Alaska

Alaska commented

2022-04-05 05:39:28 +02:00

Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'

Alaska commented

2022-04-05 05:39:28 +02:00

I believe this is a known limitation of MNEE caustics.

CC @olivier.fx can you comment on this?

I believe this is a known limitation of MNEE caustics. CC @olivier.fx can you comment on this?

Olivier Maury commented

2022-04-22 07:42:32 +02:00

Hi @Shady.Hamza and @Alaska, thanks for this case. The short answer is yes, this is unfortunately a limitation of the MNEE technique. Aside from the caster surface needing to be smooth, it also needs to be relatively flat. If that's not the case, the local approximation of the surface is completely wrong, and unless the seed path (direct path between the shading point and the light sample) is fairly close to the actual caustic path, the technique will fail.

For highly curved surfaces, as it is the case here, it is very difficult for the solver to walk past areas since it only has local information about the surface. We will hopefull extend this technique in the future, but this is a known limitation currently. I hope this make sense?

Hi @Shady.Hamza and @Alaska, thanks for this case. The short answer is yes, this is unfortunately a limitation of the MNEE technique. Aside from the caster surface needing to be smooth, it also needs to be relatively flat. If that's not the case, the local approximation of the surface is completely wrong, and unless the seed path (direct path between the shading point and the light sample) is fairly close to the actual caustic path, the technique will fail. For highly curved surfaces, as it is the case here, it is very difficult for the solver to walk past areas since it only has local information about the surface. We will hopefull extend this technique in the future, but this is a known limitation currently. I hope this make sense?

Shady Hamza commented

2022-04-22 19:51:06 +02:00

make sense yup, If it's possible I suggest maybe you could reach out to Luxcore developers maybe they could integrate their technique or do a collab with blender, just an opinion

Alaska commented

2022-04-23 01:09:01 +02:00

Changed status from 'Needs Developer To Reproduce' to: 'Archived'

Alaska closed this issue

2022-04-23 01:09:01 +02:00

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Caustics Shadows Artifacts #97054