public override float GenerateRayDifferential(CameraSample sample, out RayDifferential ray) { // Generate raster and camera samples Point Pras = new Point(sample.ImageX, sample.ImageY, 0); Point Pcamera = RasterToCamera.TransformPoint(ref Pras); ray = new RayDifferential(new Point(0, 0, 0), Vector.Normalize((Vector)Pcamera), 0.0f); // Modify ray for depth of field if (LensRadius > 0.0f) { // Sample point on lens float lensU, lensV; MonteCarloUtilities.ConcentricSampleDisk(sample.LensU, sample.LensV, out lensU, out lensV); lensU *= LensRadius; lensV *= LensRadius; // Compute point on plane of focus float ft = FocalDistance / ray.Direction.Z; Point Pfocus = ray.Evaluate(ft); // Update ray for effect of lens ray.Origin = new Point(lensU, lensV, 0.0f); ray.Direction = Vector.Normalize(Pfocus - ray.Origin); } // Compute offset rays for _PerspectiveCamera_ ray differentials ray.RxOrigin = ray.RyOrigin = ray.Origin; ray.RxDirection = Vector.Normalize((Vector)Pcamera + _dxCamera); ray.RyDirection = Vector.Normalize((Vector)Pcamera + _dyCamera); ray.Time = sample.Time; ray = CameraToWorld.TransformRayDifferential(ray); return(1.0f); }
public PerspectiveCamera( AnimatedTransform cameraToWorld, float[] screenWindow, float shutterOpen, float shutterClose, float lensRadius, float focalDistance, float fieldOfView, Film film) : base(cameraToWorld, Transform.Perspective(fieldOfView, 1e-2f, 1000.0f), screenWindow, shutterOpen, shutterClose, lensRadius, focalDistance, film) { // Compute differential changes in origin for perspective camera rays _dxCamera = RasterToCamera.TransformPoint(new Point(1, 0, 0)) - RasterToCamera.TransformPoint(new Point(0, 0, 0)); _dyCamera = RasterToCamera.TransformPoint(new Point(0, 1, 0)) - RasterToCamera.TransformPoint(new Point(0, 0, 0)); }