private void TrySelectPrimitive(ref Project project, float x, float y)
        {
            Viewport viewport = new Viewport(0, 0, _camera.Width, _camera.Height, _camera.Znear, _camera.Zfar);

            Vector3 nearClick = new Vector3(x, y, _camera.Znear);
            Vector3 farClick = new Vector3(x, y, _camera.Zfar);

            Vector3 near = Vector3.Zero;
            Vector3 far = Vector3.Zero;
            Vector3 direction = Vector3.Zero;

            bool intersects = false;

            float lastDistance = float.MaxValue;
            float distance = 0f;

            int selectedPrimitive = -1;

            for (int i = 0; i < project.CollisionPrimitiveInfos.Count; i++)
            {
                if (!project.CollisionPrimitiveInfos.Hidden)
                {
                    Console.WriteLine("Primitive {0}: {1}", i, project.CollisionPrimitiveInfos.Position);

                    switch (project.CollisionPrimitiveInfos.Primitive.Type)
                    {
                        case (int)JLG.PrimitiveType.Box:
                            JLG.Box box = (JLG.Box)project.CollisionPrimitiveInfos.Primitive;

                            near = Vector3.Unproject(nearClick, viewport, _camera.Projection, _camera.View, Matrix.Scaling(box.SideLengths) * box.TransformMatrix);
                            far = Vector3.Unproject(farClick, viewport, _camera.Projection, _camera.View, Matrix.Scaling(box.SideLengths) * box.TransformMatrix);

                            direction = far - near;
                            direction.Normalize();

                            intersects = _box.Intersects(new Ray(near, direction), out distance);
                            break;

                        case (int)JLG.PrimitiveType.Sphere:
                            JLG.Sphere sphere = (JLG.Sphere)project.CollisionPrimitiveInfos.Primitive;

                            near = Vector3.Unproject(nearClick, viewport, _camera.Projection, _camera.View, Matrix.Scaling(sphere.Radius, sphere.Radius, sphere.Radius) * sphere.TransformMatrix);
                            far = Vector3.Unproject(farClick, viewport, _camera.Projection, _camera.View, Matrix.Scaling(sphere.Radius, sphere.Radius, sphere.Radius) * sphere.TransformMatrix);

                            direction = far - near;
                            direction.Normalize();

                            intersects = _sphere.Intersects(new Ray(near, direction), out distance);
                            break;
                    }

                    Console.WriteLine("Near {0}", near);
                    Console.WriteLine("Far {0}", far);
                    Console.WriteLine("Direction {0}", direction);

                    if (intersects)
                    {
                        Console.WriteLine("Intersects at distance {0} (last: {1}).", distance, lastDistance);

                        if (distance < lastDistance)
                        {
                            lastDistance = distance;
                            selectedPrimitive = i;

                            Console.WriteLine("Selected primitive {0}.", i);
                        }
                    }

                    Console.WriteLine("");
                }
            }

            if (selectedPrimitive != -1f && project.SelectedCollisionPrimitiveInfo != selectedPrimitive)
            {
                project.SelectedCollisionPrimitiveInfo = selectedPrimitive;
                UpdateProjectTree(ref project);
            }
        }