For a project I want to use the form of the catenary, which is the form a free and flexible chain adopts when hanging from 2 points. If you invert this you get a very stable arch form.

One example for this is the arch in St. Louis:

This form is based on a mathematical formula involving e (approx. 2,71828182...)

Revit is supposed to know this number and by using the command exp(x) you can calculate e to the power of x. At least that's what the manual says.


Unfortunately, exp(x) will calculate 10 to the power of x. Took me half an hour of troubleshooting my formula to find that out.

Once I have the catenary done I'll post a tutorial on how to make one.