Simple Movement Tracker With TOPs
A simple way to track the movement in a texture we can use a cacheTOP to store the last frame and then compare it in a differenceTOP with the current texture. It shows the difference between last and this frame. If something is moving the edge of it would be visible.
Creative tangent
You can create interesting effects if you play around with bigger numbers than one or two in for the Output Index Parameter in the cacheTOP.