private Vector3D ComputeForward()
{
Matrix RX = Matrix.CreateRotationMatrix(Axis.X, alpha);
Matrix RY = Matrix.CreateRotationMatrix(Axis.Y, beta);
Matrix R = RX * RY;
Vector4D dir = new Vector4D(new Vector3D(0, 0, 1));
return (R * dir).Vect3D;
}
public Ray ShootRay(Viewport viewport, int x, int y)
{
Vector3D origin = new Vector3D(
viewport.Scaling * ((float)x + 0.5f - (float)viewport.Width / 2f),
viewport.Scaling * ((float)y + 0.5f - (float)viewport.Height / 2f),
0f);
Vector4D P = new Vector4D(origin);
Matrix RX = Matrix.CreateRotationMatrix(Axis.X, alpha);
Matrix RY = Matrix.CreateRotationMatrix(Axis.Y, beta);
Matrix R = RX * RY;
Matrix T = Matrix.CreateTranslationMatrix(position);
Vector4D realOrigin = (T * R) * P;
return new Ray(realOrigin.Vect3D, forward);
}