public override Color Sample(int x, int y, World world)
{
Color color = Color.Black;
var ray = this.RayForPixel(x, y);
Interlocked.Increment(ref Stats.PrimaryRays);
color += world.ColorAt(ray);
return(color);
}
public override Color Sample(int x, int y, World world)
{
Color color = Color.Black;
foreach (var ray in this.RaysForPixel(x, y))
{
Interlocked.Increment(ref Stats.PrimaryRays);
color += world.ColorAt(ray);
}
return(color /= NumSamples);
}
public override Color Sample(int x, int y, World world)
{
Color color = Color.Black;
Ray ray = this.RayForPixel(x, y);
Point focalPoint = ray.Position(this.focalLength);
for (int i = 0; i < this.numSamples; i++)
{
Vector apertureOffset = RandomInUnitDisk() * this.aperture;
Point newOrigin = ray.Origin + apertureOffset;
Vector direction = (focalPoint - newOrigin).Normalize();
Ray secondaryRay = new Ray(newOrigin, direction, RayType.Primary);
Interlocked.Increment(ref Stats.PrimaryRays);
color += world.ColorAt(secondaryRay);
}
return(color / (double)numSamples);
}
public override Color Sample(int x, int y, World world)
{
Color color = Color.Black;
int n = (int)Math.Sqrt((double)this.numSamples);
int numActualSamples = 0;
for (int jitterX = 0; jitterX < n; jitterX++)
{
for (int jitterY = 0; jitterY < n; jitterY++)
{
double xoffset = this.Camera.PixelSize * ((x + 0.5) + ((jitterX + 0.5) / numSamples));
double yoffset = this.Camera.PixelSize * ((y + 0.5) + ((jitterY + 0.5) / numSamples));
double world_x = this.Camera.HalfWidth - xoffset;
double world_y = this.Camera.HalfHeight - yoffset;
Point pixel = this.Camera.TransformInverse * new Point(world_x, world_y, -1);
Point origin = this.Camera.TransformInverse * new Point(0, 0, 0);
Vector direction = (pixel - origin).Normalize();
var ray = new Ray(origin, direction, RayType.Primary);
Interlocked.Increment(ref Stats.PrimaryRays);
Color currColor = world.ColorAt(ray);
if (currColor - color < colorEpsilon)
{
return(color /= numActualSamples);
}
color += currColor;
numActualSamples++;
}
}
return(color /= numActualSamples);
}
