EEVEE-Next: Subsurface material disapear if Raytraced Transmission is turned on #121667

New Issue

Clément Foucault · 2024-05-10T19:41:01+02:00

Clément Foucault commented

2024-05-10 19:41:01 +02:00

Happens only in a certain specific configuration.

Openning the file should exhibit the issue.

This happens only if the second object doesn't enabled Raytraced Transmission.

Might be caused by the optimization inside can_use_default_cb.

Happens only in a certain specific configuration. Openning the file should exhibit the issue. This happens only if the second object doesn't enabled `Raytraced Transmission`. Might be caused by the optimization inside `can_use_default_cb`.

invisible_sss.blend

4.6 MiB

Clément Foucault added this to the 4.2 LTS milestone 2024-05-10 19:41:01 +02:00

Clément Foucault added the

labels 2024-05-10 19:41:02 +02:00

Iliya Katushenock added the

Module

EEVEE & Viewport

label 2024-05-10 19:42:10 +02:00

Vitalijs Komasilovs commented

2024-05-15 08:23:25 +02:00

I did a little bit of investigation on this issue.

Depending on can_use_default_cb result some materials might be replaced with default for shadow and prepass subpasses.
Down the line these end up in different layers of DeferredPipeline, respectively opaque_layer_ or refraction_layer_.
At the end only one of these layers is actually rendered (Renderdoc shows one of them empty).

Which layer is rendered seems to be related to whichever of the materials gets first to the rendering.
I have attached simple scene with few cubes and alternating Raytraced Transmission settings. You can try to toggle Hide in Viewport on the first (left most) cube to see the effect - either all "regular" materials are rendered or all "ray-traced". But never both.

Technically there is hard check closure_count_ == 0 inside each layer which prevents it from rendering.
But I was not able to comprehend why it ends up 0 on one or another layer.

Hope this will be helpful.

I did a little bit of investigation on this issue. Depending on `can_use_default_cb` result some materials might be replaced with _default_ for `shadow` and `prepass` subpasses. Down the line these end up in different layers of `DeferredPipeline`, respectively `opaque_layer_` or `refraction_layer_`. At the end only one of these layers is actually rendered (Renderdoc shows one of them empty). Which layer is rendered seems to be related to whichever of the materials gets first to the rendering. I have attached simple scene with few cubes and alternating `Raytraced Transmission` settings. You can try to toggle `Hide in Viewport` on the first (left most) cube to see the effect - either all "regular" materials are rendered or all "ray-traced". But never both. Technically there is hard check `closure_count_ == 0` inside each layer which prevents it from rendering. But I was not able to comprehend why it ends up `0` on one or another layer. Hope this will be helpful.

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EEVEE-Next: Subsurface material disapear if Raytraced Transmission is turned on #121667