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#ifndef UNITY_VOLUME_RENDERING_INCLUDED
#define UNITY_VOLUME_RENDERING_INCLUDED
float OpticalDepthHomogeneous(float extinction, float intervalLength)
{
return extinction * intervalLength;
}
float Transmittance(float opticalDepth)
{
return exp(-opticalDepth);
}
float TransmittanceIntegralOverHomogeneousInterval(float extinction, float start, float end)
{
return (exp(-extinction * start) - exp(-extinction * end)) / extinction;
}
float3 OpticalDepthHomogeneous(float3 extinction, float intervalLength)
{
return extinction * intervalLength;
}
float3 Transmittance(float3 opticalDepth)
{
return exp(-opticalDepth);
}
float3 TransmittanceIntegralOverHomogeneousInterval(float3 extinction, float start, float end)
{
return (exp(-extinction * start) - exp(-extinction * end)) / extinction;
}
float IsotropicPhaseFunction()
{
return INV_FOUR_PI;
}
float HenyeyGreensteinPhasePartConstant(float asymmetry)
{
float g = asymmetry;
return INV_FOUR_PI * (1 - g * g);
}
float HenyeyGreensteinPhasePartVarying(float asymmetry, float LdotD)
{
float g = asymmetry;
return pow(abs(1 + g * g - 2 * g * LdotD), -1.5);
}
float HenyeyGreensteinPhaseFunction(float asymmetry, float LdotD)
{
return HenyeyGreensteinPhasePartConstant(asymmetry) *
HenyeyGreensteinPhasePartVarying(asymmetry, LdotD);
}
#endif // UNITY_VOLUME_RENDERING_INCLUDED