It generates a random four by four grid terrain that you can edit by clicking on the corners. I might try and add a fill feature where it fills different shades based on shades, but that will be really hard. Anyway, enjoy! Shading should now work, but is a little glitchy. Press space to switch between edit mode and viewing. Improved shading and added a smoothing feature (s key) along with some better graphics. Post anything you think should be added.