use turbowarp! https://turbowarp.org/1351050306?hqpen This is a real time heightmap renderer using voxel space rendering, a real fast method popularized by the game Comanche: Maximum Overkill. Will probably continue to mess with this.
FPS is showing what it would be if FPS was uncapped Mountain model by Andrei Petrukovich Texture baked in Blender perlin noise by @alltrue