public Camera Camera(IAccelerator acc, Light[] lights, EnvironmentSettings es)
{
Camera cam = new Camera((int)this.Width, (int)this.Height, this.ScreenDistance, this.FoVH, acc, lights, es);
cam.Position = this.Position;
cam.LookAt = this.Lookat;
cam.Roll = Roll;
cam.MakeDirty();
return cam;
}