Eevee SSS not rendering as expected #61377

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alon abrany · 2019-02-10T13:08:25+01:00

alon abrany commented

2019-02-10 13:08:25 +01:00

System Information
Operating system:
Graphics card:

Blender Version

blender-2.80-0b6dbbc306b0-win64 ,2019-02-10

Short description of error
Eevee SSS not rendering as expected.
when sss is on the sss works properly in viewport but renders differently.

Eeevee_SSSProblem.blend

**System Information** Operating system: Graphics card: **Blender Version** blender-2.80-0b6dbbc306b0-win64 ,2019-02-10 **Short description of error** Eevee SSS not rendering as expected. when sss is on the sss works properly in viewport but renders differently. [_Eeevee_SSSProblem_.blend](https://archive.blender.org/developer/F6568671/_Eeevee_SSSProblem_.blend) ![On viewPort.JPG](https://archive.blender.org/developer/F6568677/On_viewPort.JPG) ![On Rendr.JPG](https://archive.blender.org/developer/F6568683/On_Rendr.JPG)

alon abrany commented

2019-02-10 13:08:25 +01:00

Added subscriber: @alonabrany

Firepal commented

2019-02-10 20:54:33 +01:00

Added subscriber: @Firepal

Firepal commented

2019-02-10 20:54:33 +01:00

I've noticed raising the Subsurface value in your material tints the model slightly, so SSS seems to very partially function.
By the way, just so you know, Base.001 has inverted normals, you might wanna fix that, even if it's not a problem right now.

I've noticed raising the Subsurface value in your material tints the model slightly, so SSS seems to very partially function. By the way, just so you know, Base.001 has inverted normals, you might wanna fix that, even if it's not a problem right now.

msalv commented

2019-02-10 21:06:22 +01:00

Added subscriber: @moisessalvador

msalv commented

2019-02-10 21:06:22 +01:00

It seems Separate Albedo gets forced on during renders. If you turn on Separate Albedo, the viewport and render look the same, but I think the fact that the render doesn't respect Separate Albedo being off is a bug

Firepal commented

2019-02-10 22:31:55 +01:00

...That ain't good, then.

alon abrany commented

2019-02-10 22:38:17 +01:00

i created a new seance with 2 simple object ,the results was the same.

sss test.blend

i created a new seance with 2 simple object ,the results was the same. ![viewport.PNG](https://archive.blender.org/developer/F6572805/viewport.PNG) ![render.PNG](https://archive.blender.org/developer/F6572807/render.PNG) [sss test.blend](https://archive.blender.org/developer/F6572819/sss_test.blend)

Philipp Oeser commented

2019-02-11 13:39:56 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2019-02-11 13:39:56 +01:00

Looks indeed like this is forced

/* Force separate albedo for final render */
if (DRW_state_is_image_render()) {
    effects->sss_separate_albedo = true;
}

Looks indeed like this is forced ``` /* Force separate albedo for final render */ if (DRW_state_is_image_render()) { effects->sss_separate_albedo = true; } ```

Clément Foucault was assigned by Philipp Oeser

2019-02-11 13:43:52 +01:00

Philipp Oeser commented

2019-02-11 13:43:52 +01:00

Added subscriber: @fclem

Philipp Oeser commented

2019-02-11 13:43:52 +01:00

@fclem: Not sure what the reasoning behind this is?
(if this needs to be, should be mentioned here https://docs.blender.org/manual/en/dev/render/eevee/screen_space_effects/subsurface_scattering.html?)
(will confirm for the time being...)

@fclem: Not sure what the reasoning behind this is? (if this needs to be, should be mentioned here https://docs.blender.org/manual/en/dev/render/eevee/screen_space_effects/subsurface_scattering.html?) (will confirm for the time being...)

Clément Foucault commented

2019-02-11 14:41:26 +01:00

You are right this behavior is not good. I'll make it match the viewport.