Eevee: Refraction BSDF is using world probe during glossy bake. #77561

New Issue

Mark Stead · 2020-06-07T08:28:56+02:00

Mark Stead commented

2020-06-07 08:28:56 +02:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.19

Blender Version
Broken: version: 2.83.0, branch: master, commit date: 2020-06-03 14:38, hash: 211b6c29f7
BTW this could be "working as designed". I think Eevee has always behaved like this. Put this bug against 2.90 instead if that makes more sense.

Short description of error
I'm using a reflection cubemap around a glass shiny object in order to reflect objects in the scene rather than just the world HDRI.
When baking indirect lighting, I see that initially the glass object reflects the world environment map. Hence this causes some illumination on the light probes.
Only once baking is finished does the glass object revert to reflecting what is in the reflection cubemap.
Strangely, if I remove the glass object, and replace with a chrome object then I do not observe any illumination from the object.

Exact steps for others to reproduce the error
I will attach a blend file that has:

HDRI environment map. (Well I won't actually embed with in the file - you will need to stick in any HDRI - the one I used was https://hdrihaven.com/hdri/?h=green_point_park.)
The scene has no lights apart from the environment.
A room object (cube with solidify), and a Diffuse BSDF material (so there are no reflections).
A camera inside the room.
An irradiance volume covering the entire room. (Display of probes has been enabled)
A reflection cubemap "covering" the glass/chrome ball, but positioned next to it.
A glass ball, with Principled BSDF material (Roughness 0, Transmission 1)
A chrome ball (initially disabled from view/render), with Principled BSDF material (Roughness 0, Metallic 1)
Key thing is the the scene should be black. The entire room is a closed cube.

With viewport shading set to rendered.
Click on Bake Indirect Lighting.
When baking starts, the first you see is a black scene with glass ball environment reflections showing.
Then as the baking proceeds, the light probes capture this lighting.
Finally when baking finishes, the glass ball becomes mostly greyish - reflecting what is provided by the reflection cubemap.
The final scene is illuminated based on the lighting information initially present in the glass ball.

Disabled the glass ball object, and enable the chrome ball object instead.
Start baking again.
When baking starts, the first you see is a black scene with chrome ball environment reflections showing.
When baking finishes, the chrome ball, and the entire scene is black.
And this is what I expected when there was a glass ball.

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.19 **Blender Version** Broken: version: 2.83.0, branch: master, commit date: 2020-06-03 14:38, hash: `211b6c29f7` BTW this could be "working as designed". I think Eevee has always behaved like this. Put this bug against 2.90 instead if that makes more sense. **Short description of error** I'm using a reflection cubemap around a glass shiny object in order to reflect objects in the scene rather than just the world HDRI. When baking indirect lighting, I see that initially the glass object reflects the world environment map. Hence this causes some illumination on the light probes. Only once baking is finished does the glass object revert to reflecting what is in the reflection cubemap. Strangely, if I remove the glass object, and replace with a chrome object then I do not observe any illumination from the object. **Exact steps for others to reproduce the error** I will attach a blend file that has: - HDRI environment map. (Well I won't actually embed with in the file - you will need to stick in any HDRI - the one I used was https://hdrihaven.com/hdri/?h=green_point_park.) - The scene has no lights apart from the environment. - A room object (cube with solidify), and a Diffuse BSDF material (so there are no reflections). - A camera inside the room. - An irradiance volume covering the entire room. (Display of probes has been enabled) - A reflection cubemap "covering" the glass/chrome ball, but positioned next to it. - A glass ball, with Principled BSDF material (Roughness 0, Transmission 1) - A chrome ball (initially disabled from view/render), with Principled BSDF material (Roughness 0, Metallic 1) Key thing is the the scene should be black. The entire room is a closed cube. With viewport shading set to rendered. Click on Bake Indirect Lighting. When baking starts, the first you see is a black scene with glass ball environment reflections showing. Then as the baking proceeds, the light probes capture this lighting. Finally when baking finishes, the glass ball becomes mostly greyish - reflecting what is provided by the reflection cubemap. The final scene is illuminated based on the lighting information initially present in the glass ball. Disabled the glass ball object, and enable the chrome ball object instead. Start baking again. When baking starts, the first you see is a black scene with chrome ball environment reflections showing. When baking finishes, the chrome ball, and the entire scene is black. And this is what I expected when there was a glass ball.

Mark Stead commented

2020-06-07 08:28:56 +02:00

Added subscriber: @MarkStead-2

Mark Stead commented

2020-06-07 08:31:27 +02:00

Reflection Illumination.blend

[Reflection Illumination.blend](https://archive.blender.org/developer/F8588598/Reflection_Illumination.blend)

Mark Stead commented

2020-06-07 08:36:45 +02:00

Image showing the start of baking (21%) with the glass ball - and how some light probes are lighting up.

This is the completion of the baking for the glass ball.

Image showing the start of baking (21%) with the glass ball - and how some light probes are lighting up. ![image.png](https://archive.blender.org/developer/F8588599/image.png) This is the completion of the baking for the glass ball. ![image.png](https://archive.blender.org/developer/F8588602/image.png)

Amad Muhammad commented

2020-06-07 10:41:41 +02:00

Added subscriber: @Nakara

Amad Muhammad commented

2020-06-07 10:43:27 +02:00

Removed subscriber: @Nakara

Philipp Oeser commented

2020-06-23 15:05:03 +02:00

Added subscribers: @fclem, @lichtwerk

Philipp Oeser commented

2020-06-23 15:05:03 +02:00

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

Philipp Oeser commented

2020-06-23 15:05:03 +02:00

Can confirm.

Not seeing this mentioned in https://docs.blender.org/manual/en/dev/render/eevee/render_settings/indirect_lighting.html or otherwise being able to make sense of this [might be wrong though], would think this is a bug (or should be changed?)

CC @fclem

Can confirm. Not seeing this mentioned in https://docs.blender.org/manual/en/dev/render/eevee/render_settings/indirect_lighting.html or otherwise being able to make sense of this [might be wrong though], would think this is a bug (or should be changed?) CC @fclem

Clément Foucault commented

2020-06-23 19:03:32 +02:00

This is because the probe is capturing the ball itself. So it still appear in reflections & refractions from the inside.

A metal ball have its glossy contribution set to 0 (black) durring bake. So I guess we could do that for refraction too.

This is because the probe is capturing the ball itself. So it still appear in reflections & refractions from the inside. A metal ball have its glossy contribution set to 0 (black) durring bake. So I guess we could do that for refraction too.

Clément Foucault changed title from ~~Eevee reflective glass objects cast illumination ignoring the reflection cubemap~~ to Eevee: Refraction BSDF is using world probe during glossy bake.

2020-06-23 19:10:23 +02:00

blender-admin commented

2020-11-17 15:56:18 +01:00

This issue was referenced by dede4aac5b

This issue was referenced by dede4aac5be942d7619d29680a7534e536617946

Clément Foucault commented

2020-11-17 15:57:01 +01:00

Changed status from 'Confirmed' to: 'Resolved'

Clément Foucault closed this issue

2020-11-17 15:57:01 +01:00

Clément Foucault self-assigned this 2020-11-17 15:57:01 +01:00

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Eevee: Refraction BSDF is using world probe during glossy bake. #77561