Talos docs

render.shader.fallback

Since 0.6

a user shader's pipeline failed to compile, once per shader family; its materials draw with the built-in fallback derived from the shader at t=0 (its average base colour, emission, roughness and metallic)

Plain text
Severitywarning

Meaning

a user shader's pipeline failed to compile, once per shader family; its materials draw with the built-in fallback derived from the shader at t=0 (its average base colour, emission, roughness and metallic)

Fix

fix the error explain.rule gives for the shader's own code (shader-compile-error, shader-forbidden, shader-loop-unbounded) and rebuild