//Projection Matrix Declaration:

ProjectionMatrix = Matrix.CreatePerspectiveFieldOfView(MathHelper.PiOver4, device.Viewport.AspectRatio, 0.1f, 50f);




//Ray Declaration

            //Create two vectors. One close up and one far away.
            MouseState mouseState = Mouse.GetState();
            Vector3 NearMouseSource = new Vector3(mouseState.X, mouseState.Y, 0.0000000000000000001f);
            Vector3 FarMouseSource = new Vector3(mouseState.X, mouseState.Y, 0.9999999999999999999f);

            NearPoint = Application.Renderer.device.Viewport.Unproject(NearMouseSource, ProjectionMatrix, ViewMatrix, WorldMatrix);
            FarPoint = Application.Renderer.device.Viewport.Unproject(FarMouseSource, ProjectionMatrix, ViewMatrix, WorldMatrix);


//Device Setup

GraphicsDevice.Clear(ClearOptions.Target | ClearOptions.DepthBuffer, Color.Black, 1f, 0);