public override IRadianceEvaluation Sample(ref Vector wo, ref IRadianceEvaluation radiance, float u0, float u1, float u2,
out BsdfSample result, BrdfType flags = BrdfType.All)
{
result = new BsdfSample()
{
};
throw new NotImplementedException();
}
public IRadianceEvaluation Sample(ref Vector wo, ref IRadianceEvaluation radiance, float u0, float u1, float u2, out BsdfSample result, BrdfType flags = BrdfType.All)
{
float selPdf;
BaseBsdf bxdf = GetBsdf(out selPdf, flags);
if (bxdf == null)
{
result = new BsdfSample();
return ColorManager.Instance.ZeroRadiance();
}
Vector wo1 = bxdf.WorldToLocal(ref wo);
var r = bxdf.Sample(ref wo1, ref radiance, u0, u1, u2, out result, flags);
result.DirectPdf *= selPdf;
result.OutgoingDirection = bxdf.LocalToWorld(ref result.OutgoingDirection);
return r;
/*Vector wi = new Vector();
var wiW = Vector.Zero;
var pdf = 0f;
bool specularBounce;
if (pdf > 0f && pdf < MathLab.Epsilon) return ColorManager.Instance.ZeroRadiance();
if (flags != BrdfType.All ) flags = bxdf.Type;
wiW = bxdf.LocalToWorld(ref wi);
if ((!bxdf.Type.Has(BrdfType.Specular)) && matchingComps > 1)
{
for (int i = 0; i < bxdfs.Count; ++i)
{
if (bxdfs[i] != bxdf &&bxdfs[i].Type.Has(flags))
pdf += bxdfs[i].Pdf(scene, ref wo);
}
}
if (matchingComps > 1) pdf /= matchingComps;
if (bxdf.Type.Has(BrdfType.Specular))
{
var f = ColorManager.Instance.ZeroRadiance();
if ((Vector.Dot(ref wiW , ref bxdf.Ng)) * Vector.Dot(ref wo1 ,ref bxdf.Ng) > 0f)
// ignore BTDFs
{
flags = flags & ~BrdfType.Refractive;
}
else
// ignore BRDFs
flags = flags & ~BrdfType.Reflection;
float cosp, rwp;
for (int i = 0; i < bxdfs.Count; ++i)
if (bxdfs[i].Type.Has(flags))
f.Add(bxdfs[i].Evaluate(scene, ref wo, Vector.Dot(ref wiW, ref bxdf.Ng), out cosp, out rwp));
f.Div(pdf);
}
return f;*/
}
public float Phase(ref Vector wi, ref Vector wo, IRadianceEvaluation lambda)
{
switch (PhaseType)
{
case PhaseFunctionTypes.Isotropic:
default:
return PhaseFunctions.PhaseIsotropic(ref wi, ref wo);
case PhaseFunctionTypes.HeyneyGreenstein:
return PhaseFunctions.PhaseHG(ref wi, ref wo, 0.5f);
}
}
