Function sample

tutorials/common/tutorial/optics.h:140–148

! Samples the power cosine distribution. */

/*! Samples the power cosine distribution. */
inline void sample(const PowerCosineDistribution& This, const Vec3fa& wo, const Vec3fa& N, Sample3f &wi, const Vec2f s)
{
  Vec3fa dir = powerCosineSampleHemisphere(This.exp,s);
  Sample3f wh;
  wh.v = frame(N) * dir;
  wh.pdf = powerCosineSampleHemispherePDF(dir,This.exp);
  Sample3f r = make_Sample3f(reflect(wo,wh.v),1.0f);
  wi = make_Sample3f(r.v,wh.pdf/(4.0f*abs(dot(wo,wh.v))));
}

/*! Samples the power cosine distribution. */
#if defined(ISPC)