source/blender/draw/modes/shaders/armature_envelope_solid_frag.glsl


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flat in vec3 finalStateColor;
flat in vec3 finalBoneColor;
in vec3 normalView;

out vec4 fragColor;

void main()
{
	/* Smooth lighting factor. */
	const float s = 0.2; /* [0.0-0.5] range */
	float n = normalize(normalView).z;
	float fac = clamp((n * (1.0 - s)) + s, 0.0, 1.0);
	fragColor.rgb = mix(finalStateColor, finalBoneColor, fac);
	fragColor.a = 0.6; /* Hardcoded transparency factor. */
}