} // return value gives a weight for how much light arriving at the film (most return one)
public virtual float GenerateRayDifferential(CameraSample sample, out RayDifferential rd)
{
// rd = new RayDifferential();
float wt = GenerateRay(sample, out rd);
//x direction
CameraSample sshift = sample;
++(sshift.imageX);
Ray rx = new Ray();
float wtx = GenerateRay(sshift, out rx);
rd.rxOrigin = rx.o;
rd.rxDirection = rx.d;
// y direction
--(sshift.imageX);
++(sshift.imageY);
Ray ry = new Ray();;
float wty = GenerateRay(sshift, out ry);
rd.ryOrigin = ry.o;
rd.ryDirection = ry.d;
if (wtx == 0.0f || wty == 0.0f)
{
return(0.0f);
}
rd.hasDifferentials = true;
return(wt);
}
public virtual float GenerateRay(CameraSample sample, out Ray ray)
{
ray = new Ray(); return(0);
} // return value gives a weight for how much light arriving at the film (most return one)
public virtual float GenerateRay(CameraSample sample, out RayDifferential rd)
{
throw new NotImplementedException();
}