// float GenerateRay()
public override float GenerateRay(CameraSample sample, out Ray ray)
{
Point3 Pras = new Point3(sample.imageX, sample.imageY);
Point3 Pcamera = RasterToCamera.Caculate(Pras);
ray = new Ray(Pcamera, new Vector(0, 0, 1), 0, LR.INFINITY);//正交相机方向固定
#region modify ray for depth of filed
if (lensRadius > 0.0f)
{
// Sample point on lens
float lensU = 0, lensV = 0;
LR.ConcentricSampleDisk(sample.lensU, sample.lensV, ref lensU, ref lensV);
lensU *= lensRadius;
lensV *= lensRadius;
// Compute point on plane of focus
float ft = focalDistance / ray.d.z;
Point3 Pfocus = ray.Transfer(ft);
// Update ray for effect of lens
ray.o = new Point3(lensU, lensV, 0.0f);
ray.d = LR.Normalize(Pfocus - ray.o);
}
#endregion
ray.time = sample.time;
ray = CameraToWorld.Caculate(ray);
return(1.0f);
}
public override float GenerateRayDifferential(CameraSample sample, out RayDifferential ray)
{
Point3 Pras = new Point3(sample.imageX, sample.imageY);
Point3 Pcamera = RasterToCamera.Caculate(Pras);
ray = new RayDifferential(Pcamera, new Vector(0, 0, 1), 0, 1.0f / 0);
#region Modify ray for depth of field
if (lensRadius > 0.0)
{
// Sample point on lens
float lensU = 0, lensV = 0;
LR.ConcentricSampleDisk(sample.lensU, sample.lensV, ref lensU, ref lensV);
lensU *= lensRadius;
lensV *= lensRadius;
// Compute point on plane of focus
float ft = focalDistance / ray.d.z;
Point3 Pfocus = ray.Transfer(ft);
// Update ray for effect of lens
ray.o = new Point3(lensU, lensV, 0.0f);
ray.d = LR.Normalize(Pfocus - ray.o);
}
#endregion
ray.time = sample.time;
#region Compute ray differentials for _OrthoCamera_
if (lensRadius > 0)
{
// Compute _OrthoCamera_ ray differentials with defocus blur
// Sample point on lens
float lensU = 0, lensV = 0;
LR.ConcentricSampleDisk(sample.lensU, sample.lensV, ref lensU, ref lensV);
lensU *= lensRadius;
lensV *= lensRadius;
float ft = focalDistance / ray.d.z;
Point3 pFocus = Pcamera + dxCamera + (ft * new Vector(0, 0, 1));
ray.rxOrigin = new Point3(lensU, lensV, 0.0f);
ray.rxDirection = LR.Normalize(pFocus - ray.rxOrigin);
pFocus = Pcamera + dyCamera + (ft * new Vector(0, 0, 1));
ray.ryOrigin = new Point3(lensU, lensV, 0.0f);
ray.ryDirection = LR.Normalize(pFocus - ray.ryOrigin);
}
else
{
ray.rxOrigin = ray.o + dxCamera;
ray.ryOrigin = ray.o + dyCamera;
ray.rxDirection = ray.ryDirection = ray.d;
}
#endregion
ray.hasDifferentials = true;
ray = CameraToWorld.Caculate(ray);
return(1.0f);
}
