BlackDiamond1964 wrote:
My next question... Is there a way to make the 3D UTM tiles without using the 2D overlay?
Yes, you can export bare terrain. You can also export plain orthoimagery as ground textures, if you use the orthoimage texture set, without any grid lines. That might save some time for texturing the more remote baseboard. But beware of copyright issues with ortho-images. Landsat 7 should be okay, since it's public domain, but resolution is low, only suitable for backdrops.
Example (foreground 3D UTM tiles with 1:5,000 topo map, background orthoimage ground texture overlay):
3D UTM tiles take the terrain from the Trainz route, not from any DEM loaded in TransDEM, but for the overlay they deploy what's currently visible in TransDEM.