Stairs 2019.0
Create a flight of stairs on a polygon or street shape. With stairs.cga, the stairs ascend/descend with the slanted polygon or street shape. Use stairs_from_flat_footprint.cga on flat 2D polygons.
You can find the CGA rule files here:
https://www.arcgis.com/home/item.html?id=b9dee50a23724d5d998b0642961874d4
