public virtual double GenerateRayDifferential(CameraSample sample, ref RayDifferential rd)
{
Ray r = new Ray (rd.Origin, rd.Direction, rd.MinT, rd.MaxT, rd.Time);
double wt = GenerateRay (sample, ref r);
rd.Origin = r.Origin;
rd.Direction = r.Direction;
rd.MinT = r.MinT;
rd.MaxT = r.MaxT;
rd.Time = r.Time;
CameraSample sshift = sample;
++sshift.ImageX;
Ray rx = new Ray ();
double wtx = GenerateRay (sshift, ref rx);
rd.RxOrigin = rx.Origin;
rd.RxDirection = rx.Direction;
--sshift.ImageX;
++sshift.ImageY;
Ray ry = new Ray ();
double wty = GenerateRay (sshift, ref ry);
rd.RyOrigin = ry.Origin;
rd.RyDirection = ry.Direction;
if (wtx == 0.0 || wty == 0.0)
return 0.0;
rd.HasDifferentials = true;
return wt;
}
public override double GenerateRay(CameraSample sample, ref Ray ray)
{
++NumberOfRays;
// Generate raster and camera samples
Point pRas = new Point (sample.ImageX, sample.ImageY, 0);
Point pCam = new Point ();
RasterToCamera.Apply (pRas, ref pCam);
ray = new Ray (new Point (), new Vector (pCam), 0.0, double.PositiveInfinity);
if (LensRadius > 0.0)
{
double lensU = 0.0, lensV = 0.0;
MonteCarlo.ConcentricSampleDisk (sample.LensU, sample.LensV, ref lensU, ref lensV);
lensU *= LensRadius;
lensV *= LensRadius;
double ft = FocalDistance / ray.Direction.z;
Point pFocus = ray.Apply (ft);
ray.Origin = new Point (lensU, lensV, 0.0);
ray.Direction = (pFocus - ray.Origin).Normalized;
}
ray.Time = Util.Lerp (sample.Time, ShutterOpen, ShutterClose);
CameraToWorld.Apply (ray, ref ray);
return 1.0;
}
public abstract double GenerateRay(CameraSample sample, ref Ray ray);
public override double GenerateRayDifferential(CameraSample sample, ref RayDifferential rd)
{
++NumberOfRays;
Point pRas = new Point (sample.ImageX, sample.ImageY, 0.0);
Point pCam = new Point ();
RasterToCamera.Apply (pRas, ref pCam);
Vector dir = new Vector (pCam).Normalized;
rd = new RayDifferential (new Point (), dir, 0.0, double.PositiveInfinity);
if (LensRadius > 0.0)
{
double lensU = 0.0, lensV = 0.0;
MonteCarlo.ConcentricSampleDisk (sample.LensU, sample.LensV, ref lensU, ref lensV);
lensU *= LensRadius;
lensV *= LensRadius;
double ft = FocalDistance / rd.Direction.z;
Point pFocus = rd.Apply (ft);
rd.Origin = new Point (lensU, lensV, 0.0);
rd.Direction = (pFocus - rd.Origin).Normalized;
}
rd.RxOrigin = new Point (rd.Origin);
rd.RyOrigin = new Point (rd.Origin);
rd.RxDirection = (new Vector (pCam) + dxCamera).Normalized;
rd.RyDirection = (new Vector (pCam) + dyCamera).Normalized;
rd.Time = Util.Lerp (sample.Time, ShutterOpen, ShutterClose);
CameraToWorld.Apply (rd, ref rd);
rd.HasDifferentials = true;
return 1.0;
}
