private static Color CalculatePointColor(Ray ray, List <IIntersect> intersectables)
{
var minIntersect = double.MaxValue;
Vector3D normalAtIntersection = new Vector3D(0, 0, 0);
bool intersectionExists = false;
foreach (var intersectable in intersectables)
{
var intersections = intersectable.GetIntersection(ray);
if (intersections == null)
{
continue;
}
foreach (var intersection in intersections)
{
if (intersection < minIntersect)
{
intersectionExists = true;
minIntersect = intersection;
normalAtIntersection = intersectable.GetNormalAtIntersection(ray.GetPosition(minIntersect));
}
}
}
if (intersectionExists)
{
Vector3D rgb = 255 * 0.5 * (normalAtIntersection + new Vector3D(1, 1, 1));
return(Color.FromArgb(1, (byte)rgb.X, (byte)rgb.Y, (byte)rgb.Z));
}
// Interpolated Y Background (1-t)*255 *(Desired RGB 1) + t*255 (Desired RGB 2). Simplified
ray.Direction.Normalize();
var t = (ray.Direction.Y + 1) * 0.5;
return(Color.FromArgb(1, (byte)(255 * (1 - 0.5 * t)), (byte)(255 * (1 - 0.3 * t)), 255));
}
