public Spectrum SampleF(Vector woW, ref Vector wiW, BSDFSample bsdfSample, ref double pdf, BxDFType flags, ref BxDFType sampledType)
{
int matchingComps = NumComponents (flags);
if (matchingComps == 0)
{
pdf = 0.0;
return new Spectrum ();
}
int which = Math.Min (Util.Floor2Int (bsdfSample.uComponent * matchingComps), matchingComps - 1);
BxDF bxdf = null;
int count = which;
for (int i = 0; i < nBxDFs; ++i)
{
if (bxdfs[i].MatchesFlags (flags) && count-- == 0)
{
bxdf = bxdfs[i];
break;
}
}
Vector wo = WorldToLocal (woW);
Vector wi = new Vector ();
pdf = 0.0;
Spectrum f = bxdf.SampleF (wo, ref wi, bsdfSample.uDir[0], bsdfSample.uDir[1], ref pdf);
if (pdf == 0.0)
{
return new Spectrum ();
}
sampledType = bxdf.Type;
wiW = LocalToWorld (wi);
if ((bxdf.Type & BxDFType.BSDF_SPECULAR) == 0 && matchingComps > 1)
for (int i = 0; i < nBxDFs; ++i)
if (bxdfs[i] != bxdf && bxdfs[i].MatchesFlags (flags))
pdf += bxdfs[i].Pdf (wo, wi);
if (matchingComps > 1)
pdf /= matchingComps;
if ((bxdf.Type & BxDFType.BSDF_SPECULAR) == 0)
{
f = new Spectrum ();
if ((wiW ^ ng) * (woW ^ ng) > 0.0)
flags &= ~BxDFType.BSDF_TRANSMISSION;
else
flags &= ~BxDFType.BSDF_REFLECTION;
for (int i = 0; i < nBxDFs; ++i)
if (bxdfs[i].MatchesFlags (flags))
f += bxdfs[i].F (wo, wi);
}
return f;
}
public Spectrum SampleF(Vector wo, ref Vector wi, BSDFSample bsdfSample, ref double pdf, BxDFType flags)
{
BxDFType temp = BxDFType.BSDF_ALL;
return SampleF (wo, ref wi, bsdfSample, ref pdf, flags, ref temp);
}
