float GetSpecularThreshold( float m_fMetalness )
{
	return 0;
}

struct BRDF_t
{
	float3 m_vRayIn;
	float3 m_vRayOut;
	float3 m_vNormal;
	float3 m_vAlbedo;
	float m_fRoughness;
	float m_fMetalness;

	float FresnelDiffuseTerm( float fSine )
	{
		return (fSine * (1 - 0.5 * m_fRoughness) + 0.5 * m_fRoughness);
	}

	float3 BurleyDiffuse( )
	{
		float fSineNormalLight = saturate(dot(m_vNormal, m_vRayOut));
		float fSineNormalView = saturate(dot(m_vNormal, m_vRayIn));
		float fFresnelLight = FresnelDiffuseTerm(fSineNormalLight);
		float fFresnelView = FresnelDiffuseTerm(fSineNormalView);
		return saturate(dot(m_vNormal,m_vRayOut));
	}

	float3 GetOutGoingDirection()
	{
		return 0;
	}
}