The difference in visual quality between Low and High fidelity is staggering. Most of the difference is due to decals. Decals are individual textures placed onto the terrain. They can take different forms. Some are placed as images on the map, like the explosion scar from the initial commander warp. Other decals act as normal maps on the ground to give the appearance of roughness. Some of the official GPG maps contain hundreds of decals. If you are serious about your map, this part can be just as time consuming as the heightmap and textures—decal placement makes the difference between a pretty map and a gorgeous map.