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        /// <summary>
        /// Project a 3D point given it's world coordinates and the viewing <see cref="Camera"/> to 2D screen space.
        /// </summary>
        /// <remarks>
        /// The screen space is assumed to be in range [0..1] in both x and y dimensions, where 0 means the left/top and 1 the right/bottom edge.
        /// </remarks>
        /// <param name="camera">The viewing camera</param>
        /// <param name="position">World position of the point to be projected</param>
        /// <returns></returns>
        public static Vector2 GetScreenCoords(Camera camera, Vector3 position)
        {
            // projection calculation
            Vector4 v4 = new Vector4(position.x, position.y, position.z, 1.0f);
            Vector4 pos = camera.ProjectionMatrix * camera.ViewMatrix * v4;
            Vector2 screenPos = new Vector2(pos.x / pos.w, -pos.y / pos.w);

            // normalize screen position
            screenPos.x = (screenPos.x + 1.0f) * 0.5f;
            screenPos.y = (screenPos.y + 1.0f) * 0.5f;

            return screenPos;
        }