Thanks for letting us know @Byron .
The UTCI map component is supposed to be able to handle cases of no rooms, in which case the surface temperatures of all geometry are assumed to be the temperature of the air.
There was a bug that I accidentally introduced 3 months ago that broke this functionality. I just pushed a fix here:
And the fix should be available via the LB Versioner component in 30 minutes or so.
Adding a room into the model is also a way to work around the issue, @Hector , but EnergyPlus simulations can sometimes be very time consuming with some of the geometry that gets used for outdoor thermal comfort simulations. For this reason, we want to continue bing able to support the option of running the UTCI comfort map without the need for rooms (using only Radiance to evaluate the radiant heat exchange of human subjects with the sky).