public void RenderScene(RenderingContext context)
{
Ensure.That("context", context).IsNotNull();
//// transforms from image space into camera space
//var imageMatrix = Matrix.Scaling(1d / context.Target.Width, 1d / context.Target.Height, 1);
foreach (var pixel in context.Target.GetPixels())
{
var colorAccumulator = Color.Black;
foreach (var pixelSpaceSample in _pixelSampleGenerator.GenerateSamples(context.SamplesPerPixel))
{
var imageSpaceSample = new Point(pixel.X + pixelSpaceSample.X, pixel.Y + pixelSpaceSample.Y, 1);
var projectionSpaceRay = new Ray(context.ImageMatrix * imageSpaceSample, Vector.UnitZ);
var cameraSpaceRay = context.ProjectionMatrix * projectionSpaceRay;
// TODO: transform camera space ray into world space
colorAccumulator += _algorithm.DetermineRayColor(cameraSpaceRay, context.World);
}
context.Target.SetPixelColor(pixel, colorAccumulator / context.SamplesPerPixel);
}
}
public IEnumerable <Point2> GenerateSamples(int count)
{
foreach (var sample in _underlyingGenerator.GenerateSamples(count))
{
var transformed = (sample - new Vector2(.5f, .5f)) * 2;
yield return
(new Point2(
System.Math.Pow(System.Math.Abs(transformed.X), _bias) * System.Math.Sign(transformed.X),
System.Math.Pow(System.Math.Abs(transformed.Y), _bias) * System.Math.Sign(transformed.Y)
) / 2 + new Vector2(.5f, .5f));
}
}
