MNEE caustics don't render with specific materials when Filter Glossy = 0 #97056

New Issue

Alaska · 2022-04-05T06:02:53+02:00

Alaska commented

2022-04-05 06:02:53 +02:00

System Information
Operating system: Linux-5.16.0-5-amd64-x86_64-with-glibc2.33 64 Bits
Graphics card: NVIDIA GeForce RTX 3060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 510.54

Blender Version
Broken: version: 3.2.0 Alpha, branch: master, commit date: 2022-04-05 02:29, hash: 8333b681a7
Worked: Never as this feature was introduced recently

Short description of error
MNEE caustics won't render for Glass BSDF or Refraction BSDF with a roughness of 0 if Filter Glossy is equal to 0

Exact steps for others to reproduce the error

Change the render engine to Cycles.
Setup MNEE caustics by setting up a Caustic Caster, Caustic Receiver, and Shadow Caustic light.
Give the Caustic Caster a Glass BSDF or Refraction BSDF with roughness set to 0.
Notice that caustics are being cast from the Caustic Caster onto the Caustic Receiver
In {nav Render Properties > Light Paths > Caustics} change Filter Glossy to 0 and notice that the caustics have disappeared.
Increase the roughness of the material and notice the caustics return. Changing the material out for a Principled BSDF setup to act like glass also resolves the issue.

Based on these observations, it seems MNEE caustics don't work if you're using a casutics caster with a Glass BSDF or Refraction BSDF with a roughness of 0 and Filter Glossy of 0.
If the roughness is higher than 0, then MNEE caustics work.
If Filter Glossy is higher then 0, then MNEE caustics work.
If the material is a Principled BSDF, then MNEE caustics work.

Here is a file with steps 1-5 done for you:
#97056 - MNEE caustics and filter glossy bug.blend

**System Information** Operating system: Linux-5.16.0-5-amd64-x86_64-with-glibc2.33 64 Bits Graphics card: NVIDIA GeForce RTX 3060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 510.54 **Blender Version** Broken: version: 3.2.0 Alpha, branch: master, commit date: 2022-04-05 02:29, hash: `8333b681a7` Worked: Never as this feature was introduced recently **Short description of error** MNEE caustics won't render for `Glass BSDF` or `Refraction BSDF` with a roughness of `0` if `Filter Glossy` is equal to `0` **Exact steps for others to reproduce the error** 1. Change the render engine to Cycles. 2. Setup MNEE caustics by setting up a `Caustic Caster`, `Caustic Receiver`, and `Shadow Caustic` light. 3. Give the `Caustic Caster` a `Glass BSDF` or `Refraction BSDF` with roughness set to `0`. 4. Notice that caustics are being cast from the `Caustic Caster` onto the `Caustic Receiver` 5. In {nav Render Properties > Light Paths > Caustics} change `Filter Glossy` to `0` and notice that the caustics have disappeared. 6. Increase the roughness of the material and notice the caustics return. Changing the material out for a `Principled BSDF` setup to act like glass also resolves the issue. Based on these observations, it seems MNEE caustics don't work if you're using a casutics caster with a `Glass BSDF` or `Refraction BSDF` with a roughness of `0` and `Filter Glossy` of `0`. If the roughness is higher than `0`, then MNEE caustics work. If `Filter Glossy` is higher then `0`, then MNEE caustics work. If the material is a `Principled BSDF`, then MNEE caustics work. Here is a file with steps 1-5 done for you: [#97056 - MNEE caustics and filter glossy bug.blend](https://archive.blender.org/developer/F12972685/T97056_-_MNEE_caustics_and_filter_glossy_bug.blend)

Alaska commented

2022-04-05 06:02:53 +02:00

Added subscriber: @Alaska

Alaska changed title from ~~MNEE caustics don't render with specific materials and when Filter Glossy = 0~~ to MNEE caustics don't render with specific materials when Filter Glossy = 0

2022-04-05 06:04:39 +02:00

Alaska commented

2022-04-05 06:15:03 +02:00

Added subscriber: @olivier.fx

Alaska commented

2022-04-05 06:15:03 +02:00

CC @olivier.fx

Pratik Borhade commented

2022-04-05 07:14:15 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Pratik Borhade commented

2022-04-05 07:14:21 +02:00

Added subscriber: @PratikPB2123

Philipp Oeser commented

2022-04-14 11:14:21 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2022-04-14 11:14:21 +02:00

Following the policy of "bug in new feature = high prio", will raise priority

blender-admin commented

2022-04-28 17:52:32 +02:00

This issue was referenced by 110eb23005

This issue was referenced by 110eb2300526519681b44e154473b5fd087d191e

Brecht Van Lommel commented

2022-04-28 18:00:21 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Brecht Van Lommel closed this issue

2022-04-28 18:00:21 +02:00

Brecht Van Lommel self-assigned this 2022-04-28 18:00:21 +02:00

Brecht Van Lommel commented

2022-04-28 18:01:30 +02:00

Changed status from 'Resolved' to: 'Confirmed'

Brecht Van Lommel reopened this issue

2022-04-28 18:01:30 +02:00

Brecht Van Lommel commented

2022-04-28 18:01:30 +02:00

I used the wrong bug number in the commit, reopening.

Brecht Van Lommel removed their assignment 2022-04-28 18:01:41 +02:00

Brecht Van Lommel commented

2022-04-28 18:01:41 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2022-05-04 19:35:49 +02:00

@olivier.fx, is this something you plan to look into? Or need help with a design / implementation question?

Olivier Maury commented

2022-05-04 20:42:34 +02:00

I'm taking a look now @brecht. I believe this has to do with adding support for CLOSURE_BSDF_REFRACTION_ID and CLOSURE_BSDF_SHARP_GLASS_ID bsdfs (raising the roughness slightly will bring the caustics back).

Olivier Maury commented

2022-05-10 04:20:30 +02:00

With D14901, I now get a caustic for all 3 sharp bsdfs, includinh for example the glass bsdf with roughness 0:

With [D14901](https://archive.blender.org/developer/D14901), I now get a caustic for all 3 sharp bsdfs, includinh for example the glass bsdf with roughness 0: ![image.png](https://archive.blender.org/developer/F13063040/image.png)

blender-admin commented

2022-05-10 18:50:54 +02:00

This issue was referenced by dc55e095e6

This issue was referenced by dc55e095e6f2836c65f83c9b1bad2f7d9d98022d

Brecht Van Lommel commented

2022-05-10 19:22:41 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Brecht Van Lommel closed this issue

2022-05-10 19:22:41 +02:00

Brecht Van Lommel self-assigned this 2022-05-10 19:22:41 +02:00

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MNEE caustics don't render with specific materials when Filter Glossy = 0 #97056