StackableMatCap.surfsader

BEGIN_OPTIONS
	Workflow "Unlit"
END_OPTIONS

BEGIN_PROPERTIES
	_Matcap("Matcap Texture", 2D) = "white" {}
END_PROPERTIES

BEGIN_CODE

	TEXTURE2D(_Matcap);
	SAMPLER(sampler_Matcap);

	void SurfaceFunction(inout Surface o, ShaderData d)
	{
		float3 up = mul((float3x3)UNITY_MATRIX_I_V, float3(0,1,0));
		float3 right = normalize(cross(up, d.worldSpaceViewDir));
		up = cross(d.worldSpaceViewDir, right);
		float2 matcapUV = mul(float3x3(right, up, d.worldSpaceViewDir), d.worldSpaceNormal).xy;
		matcapUV = matcapUV * 0.5 + 0.5;
		o.Albedo *= SAMPLE_TEXTURE2D(_Matcap, sampler_Matcap, matcapUV).rgb;
	}

END_CODE