Render to texture code
Extend the render to texture code with a post process effect of your own design. Groups of two can do a simple effect like the swirl example; groups of three should do a more complex effect like an edge detect filter.
Here is an example edge detect kernel. The sampled fragment is at the center. You'll need to lookup nearby fragments and weight them according to the kernel. $$ \begin{bmatrix} 0 & -1 & 0 \\ -1 & 4 & -1 \\ 0 & -1 & 0 \end{bmatrix} $$
Rubric
| Design and implement a post process effect with render to texture | 0: No effect | 5: Simple modification of example effect | 10: Interesting effect appropriate to group size |