public LensRayTransferFunction.Parameters ConvertBackSurfaceRayToParameters(Ray ray)
{
Vector3d canonicalNormal = Vector3d.UnitZ;
double surfaceSinTheta = backSurfaceSinTheta;
Sphere sphericalSurface = backSphericalSurface;
ElementSurface surface = ElementSurfaces.First();
return(ConvertSurfaceRayToParameters(ray, canonicalNormal,
surfaceSinTheta, sphericalSurface, surface));
}
/// <summary>
///
/// </summary>
/// <param name="sample">Sample in parametric UV space [0; 1]^2</param>
/// <param name="direction">Direction relative to local frame on the
/// surface point in normalized spherical coordinates [0; 1]^2, similar
/// to Sampler.UniformSampleSphere().
/// X = theta ... elevation (from plane to normal)
/// Y = phi ... azimuth</param>
/// <returns></returns>
public Ray ConvertParametersToBackSurfaceRay(
LensRayTransferFunction.Parameters parameters)
{
Vector3d canonicalNormal = Vector3d.UnitZ;
double surfaceSinTheta = backSurfaceSinTheta;
Sphere sphericalSurface = backSphericalSurface;
ElementSurface surface = ElementSurfaces.First();
return(ConvertParametersToSurfaceRay(parameters,
canonicalNormal, surfaceSinTheta, sphericalSurface, surface));
}
