/// <summary>
/// Generates a ray going from camera lens towards the scene
/// (in camera space).
/// </summary>
/// <param name="senzorPoint">Position on output image (in image raster
/// space)</param>
/// <returns>Outgoint ray or null if the ray is absorbed inside lens.
/// </returns>
public Ray GenerateRay(Vector2d imagePos, Vector2d sample)
{
// for a position on the sensor generate a position on the lens
// Generates a ray from senzor to lens back pupil given position on
// image which corresponds to the senzor position.
Vector3d senzorPos = Sensor.ImageToCamera(imagePos);
Vector3d lensPos = LensToCamera(Lens.GetBackSurfaceSample(sample));
Ray outgoingRay = Lens.Transfer(senzorPos, lensPos);
return(outgoingRay);
}
public Ray Transfer(Ray incomingRay)
{
if (BackStop.Intersect(incomingRay) == null)
{
return(null);
}
Ray outgoingRay = Lens.Transfer(incomingRay);
if (outgoingRay == null)
{
return(null);
}
if (FrontStop.Intersect(outgoingRay) == null)
{
return(null);
}
return(outgoingRay);
}
public FloatMapImage RenderImage(Size imageSize)
{
int height = imageSize.Height;
int width = imageSize.Width;
FloatMapImage outputImage = new FloatMapImage((uint)width, (uint)height, PixelFormat.Greyscale);
Sensor.RasterSize = imageSize;
Sampler sampler = new Sampler();
int SqrtSampleCount = (int)Math.Sqrt(SampleCount);
foreach (Vector2d sample in sampler.GenerateJitteredSamples(SqrtSampleCount))
{
// generate a sample at the lens surface
Vector3d lensPos = Lens.GetBackSurfaceSample(sample);
lensPos.Z = 0;
// make an incoming ray from the light source to the lens sample and
// transfer the incoming ray through the lens creating the outgoing ray
Ray outgoingRay = Lens.Transfer(LightSourcePosition, lensPos);
if (outgoingRay == null)
{
continue;
}
// intersect the senzor with the outgoing ray
Intersection intersection = Sensor.Intersect(outgoingRay);
if (intersection == null)
{
continue;
}
Vector3d intersectionPoint = intersection.Position;
Vector2d intersectionPixelPoint = Sensor.CameraToImage(intersectionPoint);
// put a splat on the senzor at the intersection
Splat(outputImage, LightIntensity, intersectionPixelPoint);
}
return(outputImage);
}
