/**
* Renders the part <code>id</code> of <code>splitCount</code> of the image to ibuf.
*
* @param id a number from <code>0</code> to <code>splitCount-1</code>
*/
private int RenderImagePart(int id)
{
int splitCount = _threadCount * SplitMultiplier;
int slotHeight = _heightPx / splitCount;
int from = slotHeight * id;
int to = slotHeight * (id + 1);
if (id == splitCount - 1)
{
to = _heightPx;
}
BackwardRayTracer logic = GetLogic();
Camera camera = _scene.Camera;
var baseDirection = camera.ViewPaneEdge - camera.Position;
var vertAdd = camera.ViewPaneHeightVector / (_heightPx - 1);
var horzAdd = camera.ViewPaneWidthVector / (_widthPx - 1);
int localMaxBrightness = 0;
for (int i = from; i < to; i++)
{
for (int j = 0; j < _widthPx; j++)
{
var ray = new Shapes.Ray {
Origin = camera.Position,
Direction = (baseDirection + vertAdd * i + horzAdd * j).Normalize()
};
WideColor color = logic.Shoot(ray);
ushort localBrightness = color.GetMax();
if (localBrightness > localMaxBrightness)
{
localMaxBrightness = localBrightness;
}
_lbuf[i, j] = color;
}
}
return(localMaxBrightness);
}
public abstract double GetHitPointDistance(Ray r);