Add world.rendertunnels to export the map's tunnel texture to a file No processing is done on this so it's not directly usable 1. It's black and white - ignore all channels except red 2. There's no scale option for the command - it will always give a 2048x2048 texture, so manual scaling is required 3. When overlaying on top of the map, this texture extends beyond what rendermap gives (by like 25% or so? think it depends on map size)