First off, awesome! I've only ever made dungeon crawlers like this with flat textures so the ability to use 3d models in such an easy way is great!
I have an issue I'm running into where my wall textures are appearing black on the top half. I can change this by changing the ambient light setting, but there is still a noticeable dividing line. I'm using the wall texture from this pack. I have everything scaled and oriented correctly so I'm not sure if it's an issue with the model or there is a bug.
Two other things that would make this tool perfect is if the atlas name was placed in the json. Currently, my exported atlases all have the name "layers." And secondly, if the render width and depth could be added to the json, that would be perfect! Including the viewport width and height would be nice too.
Thanks for create such an awesome tool!