Light are not colored after passed in a material with transmission in Volume (cycles/ eevee) #101448

New Issue

Donovane · 2022-09-29T04:34:18+02:00

Donovane commented

2022-09-29 04:34:18 +02:00

System Information
Operating system: win 11 x64
Graphics card: RTX 2060

Blender Version
Broken: 3.3
Worked: null

Short description of error
Fog don't take the color of of the transmission material. Exemple light white passed in a glass red, also the light are red now. in blender no is stay wihite when he passed in the windows the volume don't change the color.

Exact steps for others to reproduce the error
create a spot
create a volume cube with density
create a wall with transmission and low IOR and put a color in base color.

And as you can see the fog after passed in the glass are colored with the light source color and not with the material glass color like a filter put on a light for color it. in blender this thing don't exist.

**System Information** Operating system: win 11 x64 Graphics card: RTX 2060 **Blender Version** Broken: 3.3 Worked: null **Short description of error** Fog don't take the color of of the transmission material. Exemple light white passed in a glass red, also the light are red now. in blender no is stay wihite when he passed in the windows the volume don't change the color. **Exact steps for others to reproduce the error** create a spot create a volume cube with density create a wall with transmission and low IOR and put a color in base color. And as you can see the fog after passed in the glass are colored with the light source color and not with the material glass color like a filter put on a light for color it. in blender this thing don't exist.

Donovane commented

2022-09-29 04:34:18 +02:00

Added subscriber: @dodo-2

Donovane changed title from ~~Light are not colored after passed in a material with transmission in Volume~~ to Light are not colored after passed in a material with transmission in Volume (cycles/ eevee)

2022-09-29 04:34:58 +02:00

Pratik Borhade commented

2022-09-29 06:07:29 +02:00

Added subscriber: @PratikPB2123

Pratik Borhade commented

2022-09-29 06:07:29 +02:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Pratik Borhade commented

2022-09-29 06:07:29 +02:00

Thanks for the report. I'm not sure how exactly to recreate the scene. Could you share your .blend file?

Donovane commented

2022-09-29 16:02:30 +02:00

i have put a transmission and the light don't pass in the mesh.
the light as not colored when he passed out the mesh.

problem: the light are not colored when he passe out the mesh with transmission and he not got out when he hit the mesh.

broken.blend

As you can see, the beam of light don't pass in the transmission he simply stopped and he not colored

1. i have put a transmission and the light don't pass in the mesh. 2. the light as not colored when he passed out the mesh. problem: the light are not colored when he passe out the mesh with transmission and he not got out when he hit the mesh. [broken.blend](https://archive.blender.org/developer/F13592314/broken.blend) As you can see, the beam of light don't pass in the transmission he simply stopped and he not colored ![Capture d’écran 2022-09-29 à 15.59.10.png](https://archive.blender.org/developer/F13592319/Capture_d_e_cran_2022-09-29_a__15.59.10.png)

Donovane commented

2022-10-01 21:50:28 +02:00

@PratikPB2123 this the wrong result.

Iliya Katushenock commented

2022-10-01 22:00:32 +02:00

Added subscriber: @mod_moder

Iliya Katushenock commented

2022-10-01 22:00:32 +02:00

Changed status from 'Needs User Info' to: 'Archived'

Iliya Katushenock closed this issue

2022-10-01 22:00:32 +02:00

Iliya Katushenock commented

2022-10-01 22:00:32 +02:00

2022-10-01 22-59-31.mp4

[2022-10-01 22-59-31.mp4](https://archive.blender.org/developer/F13603900/2022-10-01_22-59-31.mp4)

Iliya Katushenock commented

2022-10-01 22:10:03 +02:00

It was about how volume interacts with light. But if you meant exactly the color rendition, then I think it would be more logical like this:
2022-10-01 23-09-31.mp4

It was about how volume interacts with light. But if you meant exactly the color rendition, then I think it would be more logical like this: [2022-10-01 23-09-31.mp4](https://archive.blender.org/developer/F13603945/2022-10-01_23-09-31.mp4)

Donovane commented

2022-10-02 17:02:51 +02:00

Changed status from 'Archived' to: 'Resolved'

donovane was assigned by Donovane

2022-10-02 17:02:51 +02:00

Donovane commented

2022-10-02 17:02:51 +02:00

I'm sorry but isn't logical to reduce the alpha for get the result. the transmission ray have clearly a problem.... by default in real life you can't result the alpha of an object and the light pass in ... You have just get around the problem not fixies. and the light fog are already not colored when he pass in the glass material at the output logically is colored in red.... is like a philter... conclusion this task is definitively not closed and not resolved....

Donovane commented

2022-10-02 17:06:14 +02:00

Added subscribers: @fclem, @Jeroen-Bakker

Donovane commented

2022-10-02 17:06:14 +02:00

This comment was removed by @dodo-2

*This comment was removed by @dodo-2*

Donovane commented

2022-10-02 17:06:49 +02:00

In #101448#1426567, @dodo-2 wrote:
I'm sorry but isn't logical to reduce the alpha for get the result. the transmission ray have clearly a problem.... by default in real life you can't result the alpha of an object and the light pass in ... You have just get around the problem not fixies. and the light fog are already not colored when he pass in the glass material at the output logically is colored in red.... is like a philter... conclusion this task is definitively not closed and not resolved....

@fclem CCan you see that please also @Jeroen-Bakker

> In #101448#1426567, @dodo-2 wrote: > I'm sorry but isn't logical to reduce the alpha for get the result. the transmission ray have clearly a problem.... by default in real life you can't result the alpha of an object and the light pass in ... You have just get around the problem not fixies. and the light fog are already not colored when he pass in the glass material at the output logically is colored in red.... is like a philter... conclusion this task is definitively not closed and not resolved.... @fclem CCan you see that please also @Jeroen-Bakker

Pratik Borhade commented

2022-10-02 17:17:43 +02:00

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

Pratik Borhade reopened this issue

2022-10-02 17:17:43 +02:00

Iliya Katushenock commented

2022-10-02 17:20:30 +02:00

Hm. Really. I'm sorry, I thought you needed to work this out. In that case, according to the documentation:
Controls the transparency of the surface, with 1.0 fully opaque. Usually linked to the Alpha output of an Image Texture node.
It appears to be a technical type of transparency designed specifically for textures.
That is, it does not produce any physical reactions with light, but simply passes it through. You need to use shaders that implement exactly the transmission of light with interaction with it.

Hm. Really. I'm sorry, I thought you needed to work this out. In that case, according to the documentation: `Controls the transparency of the surface, with 1.0 fully opaque. Usually linked to the Alpha output of an Image Texture node.` It appears to be a technical type of transparency designed specifically for textures. That is, it does not produce any physical reactions with light, but simply passes it through. You need to use shaders that implement exactly the transmission of light with interaction with it.

Donovane commented

2022-10-02 21:03:39 +02:00

FOR EEEVEE ! For some reasons in the shader when you change the shadown mode opaque to none, the light pass throught the mesh but is not colored.... But here we want a shadow and the light pass throught the mesh and colored the mean light when he passe throught the "Mesh" with transmission . when the light are passed throught the mesh the mean light must be colored by the color of the transmission. But here not.

And in cycles nothing works the light not pass throught the mesh and stay not colored too.

FOR EEEVEE ! For some reasons in the shader when you change the shadown mode opaque to none, the light pass throught the mesh but is not colored.... But here we want a shadow and the light pass throught the mesh and colored the mean light when he passe throught the "Mesh" with transmission . when the light are passed throught the mesh the mean light must be colored by the color of the transmission. But here not. ![Capture d’écran 2022-10-02 à 21.03.16.png](https://archive.blender.org/developer/F13607519/Capture_d_e_cran_2022-10-02_a__21.03.16.png) And in cycles nothing works the light not pass throught the mesh and stay not colored too.

Clément Foucault commented

2022-10-03 09:42:07 +02:00

Eevee does not support colored shadows. So this behavior is impossible to reproduce.

donovane was unassigned by Donovane

2022-10-03 16:36:44 +02:00

Donovane commented

2022-10-03 16:36:44 +02:00

Added subscriber: @Stimes59

Iliya Katushenock commented

2022-10-03 16:46:13 +02:00

Is there any other reason for this report?
I correctly understood that:
The Transparency Behavior of the Principled BSDF node is not required to create any kind of physical reaction of the light to the surface in order to have a colored shadow.
To do this, you need to use special shaders.
It won't work for eevee, so just cycles and special translucency shaders.

So for now the report does not describe any bug...

Is there any other reason for this report? I correctly understood that: The Transparency Behavior of the Principled BSDF node is not required to create any kind of physical reaction of the light to the surface in order to have a colored shadow. To do this, you need to use special shaders. It won't work for eevee, so just cycles and special translucency shaders. So for now the report does not describe any bug...

Brecht Van Lommel commented

2022-10-03 16:59:11 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2022-10-03 16:59:11 +02:00

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

Brecht Van Lommel closed this issue

2022-10-03 16:59:11 +02:00

Brecht Van Lommel commented

2022-10-03 16:59:11 +02:00

There is indeed no bug here, but rather known limitations of Eevee and Cycles.

Rendering colored volume caustics like this is not supported currently.

There is indeed no bug here, but rather known limitations of Eevee and Cycles. Rendering colored volume caustics like this is not supported currently.

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Light are not colored after passed in a material with transmission in Volume (cycles/ eevee) #101448