I am using Curtain System by Face to make a curtain wall on sloped walls. I am having a problem with the default orientation of the mullions. Some of my faces have oddly angled tops and the vertical mullions seem to be looking at those edges to get something to be perpendicular to.
The image attached shows the system I'm talking about. I need the vertical mullions to be perpendicular with the ground, not the roof line. I have tried editing the grid itself, and I have heard that splitting the surface will not allow me to create a curtain wall system.