//#ifndef UNITY_ANISOTROPIC_COMMON_INCLUDED
//#define UNITY_ANISOTROPIC_COMMON_INCLUDED

// ------------------------------------------------------------------
//  Maths helpers

// Octahedron Normal Vectors
// [Cigolle 2014, "A Survey of Efficient Representations for Independent Unit Vectors"]
//						Mean	Max
// oct		8:8			0.33709 0.94424
// snorm	8:8:8		0.17015 0.38588
// oct		10:10		0.08380 0.23467
// snorm	10:10:10	0.04228 0.09598
// oct		12:12		0.02091 0.05874

float2 UnitVectorToOctahedron(float3 N)
{
	N.xy /= dot(1, abs(N));
	if (N.z <= 0)
	{
		N.xy = (1 - abs(N.yx)) * (N.xy >= 0 ? float2(1, 1) : float2(-1, -1));
	}
	return N.xy;
}

float3 OctahedronToUnitVector(float2 Oct)
{
	float3 N = float3(Oct, 1 - dot(1, abs(Oct)));
	if (N.z < 0)
	{
		N.xy = (1 - abs(N.yx)) * (N.xy >= 0 ? float2(1, 1) : float2(-1, -1));
	}
	return float3(1, 1, 1);
	return normalize(N);
}

//#endif UNITY_ANISOTROPIC_COMMON_INCLUDED