void IsotropicPhongSPF::Scatter(
const RayIntersectionGeometric& ri, ///< [in] Geometric intersection details for point of intersection
const RandomNumberGenerator& random, ///< [in] Random number generator
ScatteredRayContainer& scattered, ///< [out] The list of scattered rays from the surface
const IORStack* const ior_stack ///< [in/out] Index of refraction stack
) const
{
const Scalar rdotn = Vector3Ops::Dot(ri.ray.dir, ri.vNormal);
const Vector3 n = rdotn > 0 ? -ri.onb.w() : ri.onb.w();
const Vector3 reflected = Optics::CalculateReflectedRay( ri.ray.dir, n );
const RISEPel N = exponent.GetColor(ri);
ScatteredRay diffuse, specular;
GenerateDiffuseRay( diffuse, rdotn, ri, Point2( random.CanonicalRandom(), random.CanonicalRandom() ) );
if( N[0] == N[1] && N[1] == N[2] ) {
GenerateSpecularRay( specular, n, reflected, ri, Point2( random.CanonicalRandom(), random.CanonicalRandom() ), N[0] );
specular.kray = Rs.GetColor(ri);
scattered.AddScatteredRay( specular );
} else {
const RISEPel spec = Rs.GetColor(ri);
const Point2 ptrand( random.CanonicalRandom(), random.CanonicalRandom() );
for( int i=0; i<3; i++ ) {
GenerateSpecularRay( specular, n, reflected, ri, ptrand, N[i] );
specular.kray = 0.0;
specular.kray[i] = spec[i];
scattered.AddScatteredRay( specular );
}
}
diffuse.kray = Rd.GetColor(ri);
scattered.AddScatteredRay( diffuse );
}
void IsotropicPhongSPF::ScatterNM(
const RayIntersectionGeometric& ri, ///< [in] Geometric intersection details for point of intersection
const RandomNumberGenerator& random, ///< [in] Random number generator
const Scalar nm, ///< [in] Wavelength the material is to consider (only used for spectral processing)
ScatteredRayContainer& scattered, ///< [out] The list of scattered rays from the surface
const IORStack* const ior_stack ///< [in/out] Index of refraction stack
) const
{
const Scalar rdotn = Vector3Ops::Dot(ri.ray.dir, ri.vNormal);
const Vector3 n = rdotn > 0 ? -ri.onb.w() : ri.onb.w();
const Vector3 reflected = Optics::CalculateReflectedRay( ri.ray.dir, n );
ScatteredRay diffuse, specular;
GenerateDiffuseRay( diffuse, rdotn, ri, Point2( random.CanonicalRandom(), random.CanonicalRandom() ) );
GenerateSpecularRay( specular, n, reflected, ri, Point2( random.CanonicalRandom(), random.CanonicalRandom() ), exponent.GetColorNM(ri,nm) );
diffuse.krayNM = Rd.GetColorNM(ri,nm);
specular.krayNM = Rs.GetColorNM(ri,nm);
scattered.AddScatteredRay( diffuse );
scattered.AddScatteredRay( specular );
}
