Toon/Cel Shader Issue on Volume Shader (VDB, Volumetric Fog)

[cuong3799]

Hi everyone,

I’m having an issue where a character using a toon shader applied in Post Process doesn’t render correctly when it intersects with or goes behind a VDB cloud/volume.

Has anyone experienced this issue before or knows how to fix it?

[brs-sebascova]

Hello there @cuong3799!

Checking around the community, certain shaders tend to have conflicts with fog effects, specially with PP mixed. First that comes to mind, it could be an issue with your material’s blend location, which establishes at what point of rendering is the toon shader applied.

To test this out, open your PP toon shader mat, navigate to details, and look for the post process material section. Open the drop down menu for “Blendable Location”, and experiment with each setting. Before translucency settings should ensure that the shader is applied to the character before the volumetric fog, and after translucency will do the opposite.

For further reading, please check the related scenarios below, with other methods for testing:

Glitch problem with my toon shader

Hello everyone, I’m having a small problem with my toon shader on UE 5.5. At first, I had a lot of glitches appearing around my character when he was moving. I changed Blendable Location from Scene Color Before DOF to Scene Color Before Bloom and changed the antialiasing from Temporal Super Resolution (TSR) to Fast Approximate Anti-Aliasing (FXAA). I ​​thought I’d completely fixed the problem, but I later realized that glitches reappeared when my character is moving when it is close to a light …

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hi I created à simple outline post process. But the problem is if i add a fog or any effect with little transparency, the outline is clearly visible, check the screen : [Capture d’écran 2024-11-08 191357] Do you have a solution for the outline not visible if they are behind any effect ?