public ViewPlane(int width, int height, Camera camera)
{
this.pixelWidth = width;
this.pixelHeight = height;
this.camera = camera;
this.worldHeight = 2 * Math.Tan(Func.DegreeToRadian(camera.GetFOVY())/2);
this.worldWidth = worldHeight * (double)PixelWidth / (double)PixelHeight;
CalculateUpperLeft();
}
public static Ray RayThruPixels(Camera cam, int i, int j)
{
double alpha = Math.Tan(DegreeToRadian(cam.GetFOVX()) / 2) * (j - (Screen.width / 2)) / (Screen.width / 2);
double beta = Math.Tan(DegreeToRadian(cam.GetFOVY()) / 2) * ((Screen.height / 2) - i) / (Screen.height / 2);
Vector position = cam.GetLookFrom();
Vector temp = (cam.GetVectorU() * alpha + cam.GetVectorV() * beta - cam.GetVectorW() );
Vector direction = temp / temp.Distance();
return new Ray(position, direction);
}
