I work on a personal projet with world machine and unreal 4. I have just a question about the result in UE4, what is the best way to texture my mesh from world machine ? I saw a lot of video where people used the mask from WM to put custom textures in RGB channels for the diffuse map and other that used photoshop to combine different mask with a diffuse from WM. In the two method there is always a lot of pixels in my diffuse and that is not what I want … Also when I am in walk mode my shapes are really bloby. I put screenshots to show what I mean.
if you use the mask method, you will at least get details with tiling textures masked by the images of snow for example like you have there. But you are facing the issue of looking good from a far or looking good close up. Its hard to have both. So try masking and tiling