Per-material shadow bias

It currently sits in the light, but as it happens the same value of bias would fix one object in the scene while causing problems for another. How hard would it be to add an optional bias to the material, and will this work for e g #12919

Looking at the code, it is just passed as the uniform parameter, so altering it should not be a problem?

Ok no, looks like those are some different uniforms, for shadow pass or something. It is not on material uniforms in onBeforeCompile 😦

It is actually in param.uniforms.directionalLights.value[0]

Ok, so I was able to do this hack:

material.onBeforeCompile = function(stuff) {
	var chunk = THREE.ShaderChunk.shadowmap_pars_fragment
		.split ('z += shadowBias')
		.join ('z += shadowBias - 0.001');
	stuff.fragmentShader = stuff.fragmentShader
		.split ('#include <shadowmap_pars_fragment>')
		.join (chunk);
};

so this is definitely possible.

[Mugen87]

Instead of moving shadow properties to materials, it’s better to focus on #13108. Meaning investigating and introducing new shadow approaches for tweaking shadows (like normalBias).

[mrdoob]

I don’t think so. It’s a new property in the shadow.

You can try it in the editor:

shadow.normalBias = 0:

shadow.normalBias = 0.05: