/// <inheritdoc />
public override double GenerateRay(CameraSample sample, out Ray ray)
{
//ProfilePhase prof(Prof::GenerateCameraRay);
// Compute raster and camera sample positions
Point3D pFilm = new Point3D(sample.FilmPoint.X, sample.FilmPoint.Y, 0.0);
Point3D pCamera = RasterToCamera.AtPoint(pFilm);
ray = new Ray(new Point3D(0.0, 0.0, 0.0), pCamera.ToVector3D().Normalize());
// Modify ray for depth of field
if (LensRadius > 0.0)
{
// Sample point on lens
Point2D pLens = LensRadius * Sampling.ConcentricSampleDisk(sample.LensPoint);
// Compute point on plane of focus
double ft = FocalDistance / ray.Direction.Z;
Point3D pFocus = ray.AtPoint(ft);
// Update ray for effect of lens
ray.Origin = new Point3D(pLens.X, pLens.Y, 0.0);
ray.Direction = (pFocus - ray.Origin).ToVector3D().Normalize();
}
ray.Time = PbrtMath.Lerp(sample.Time, ShutterOpen, ShutterClose);
ray.Medium = Medium;
ray = CameraToWorld.ExecuteTransform(ray);
return(1.0);
}
/// <inheritdoc />
public override double GenerateRayDifferential(CameraSample sample, out RayDifferential ray)
{
//ProfilePhase prof(Prof::GenerateCameraRay);
// Compute raster and camera sample positions
Point3D pFilm = new Point3D(sample.FilmPoint.X, sample.FilmPoint.Y, 0.0);
Point3D pCamera = RasterToCamera.ExecuteTransform(pFilm);
Vector3D dir = new Vector3D(pCamera.X, pCamera.Y, pCamera.Z).Normalize();
ray = new RayDifferential(new Point3D(0.0, 0.0, 0.0), dir);
// Modify ray for depth of field
if (LensRadius > 0.0)
{
// Sample point on lens
Point2D pLens = LensRadius * Sampling.ConcentricSampleDisk(sample.LensPoint);
// Compute point on plane of focus
double ft = FocalDistance / ray.Direction.Z;
Point3D pFocus = ray.AtPoint(ft);
// Update ray for effect of lens
ray.Origin = new Point3D(pLens.X, pLens.Y, 0.0);
ray.Direction = (pFocus - ray.Origin).ToVector3D().Normalize();
}
// Compute offset rays for _PerspectiveCamera_ ray differentials
if (LensRadius > 0.0)
{
// Compute _PerspectiveCamera_ ray differentials accounting for lens
// Sample point on lens
Point2D pLens = LensRadius * Sampling.ConcentricSampleDisk(sample.LensPoint);
Vector3D dx = (pCamera.ToVector3D() + _dxCamera).Normalize();
double ft = FocalDistance / dx.Z;
Point3D pFocus = new Point3D(0.0, 0.0, 0.0) + (ft * dx).ToPoint3D();
ray.RxOrigin = new Point3D(pLens.X, pLens.Y, 0.0);
ray.RxDirection = (pFocus - ray.RxOrigin).ToVector3D().Normalize();
Vector3D dy = (pCamera.ToVector3D() + _dyCamera).Normalize();
ft = FocalDistance / dy.Z;
pFocus = new Point3D(0.0, 0.0, 0.0) + (ft * dy).ToPoint3D();
ray.RyOrigin = new Point3D(pLens.X, pLens.Y, 0.0);
ray.RyDirection = (pFocus - ray.RyOrigin).ToVector3D().Normalize();
}
else
{
ray.RxOrigin = ray.RyOrigin = ray.Origin;
ray.RxDirection = (pCamera.ToVector3D() + _dxCamera).Normalize();
ray.RyDirection = (pCamera.ToVector3D() + _dyCamera).Normalize();
}
ray.Time = PbrtMath.Lerp(sample.Time, ShutterOpen, ShutterClose);
ray.Medium = Medium;
ray = new RayDifferential(CameraToWorld.ExecuteTransform(ray))
{
HasDifferentials = true
};
return(1.0);
}
public Point2I Lerp(Point2I t)
{
return(new Point2I(PbrtMath.Lerp(t.X, MinPoint.X, MaxPoint.X),
PbrtMath.Lerp(t.Y, MinPoint.Y, MaxPoint.Y)));
}
public Point3D Lerp(Point3D t)
{
return(new Point3D(PbrtMath.Lerp(t.X, MinPoint.X, MaxPoint.X),
PbrtMath.Lerp(t.Y, MinPoint.Y, MaxPoint.Y),
PbrtMath.Lerp(t.Z, MinPoint.Z, MaxPoint.Z)));
}