} // 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 RayDifferential Caculate(RayDifferential r)
{
RayDifferential rd = new RayDifferential(Caculate(r.o), Caculate(r.d));
rd.rxOrigin = Caculate(r.rxOrigin);
rd.rxDirection = Caculate(r.rxDirection);
rd.ryOrigin = Caculate(r.ryOrigin);
rd.ryDirection = Caculate(r.ryDirection);
rd.hasDifferentials = r.hasDifferentials;
return(rd);
}
public RayDifferential Caculate(RayDifferential r)
{
RayDifferential tr;//= new RayDifferential();
if (!actuallyAnimated || r.time <= startTime)
{
tr = startTransform.Caculate(r);
}
else if (r.time >= endTime)
{
tr = endTransform.Caculate(r);
}
else
{
Transform t;
Interpolate(r.time, out t);
tr = t.Caculate(r);
}
tr.time = r.time;
return(tr);
}
public virtual float GenerateRay(CameraSample sample, out RayDifferential rd)
{
throw new NotImplementedException();
}
