Hey @chris thanks for responding, yeah I’ve looked at other posts with the same error (1. UWG model simulation failed and 2. Error while running the Urban Weather Generator/Dragonfly: **list index out of range**)
I did set all terrain geometries as the _terrain input, made sure the surface direction was correct. I’ve also tried using a simple rectangular surface as well to see if it would solve it.
The only way I could the the UWG component to run was by reducing surface, as mentioned by second post I looked at. When I scale the surface down I get values for the footprint density, which allows the UWG to run properly.
I found that with a larger surface it sets the footprint density to 0.0.