I'm testing constraints with an extrusion along a path to create a door frame. I want to constrain the height and width and have them as variables but when I attempt to 'flex' the variables the results are inconsistent and wrong. I've created the constraints by constraining the path before extruding as I can't see a way to do it afterwards. The height constraint seems to work but the width is giving odd results. Example attachedperforatorNamedViewtest.dgn
i had a very quick look at the file and the unexpected behaviours you are seeing when changing variables' values is due to the profile not being well constrained. you should always try to draw your profiles as closed shapes and check their DOF (degrees of freedom) is 0/. This means that there is only one possible solution for any change of the parameters. This somethimes may be tricky when the profile is complex it is worth getting used to do so.
I have attached a quick edit of your file, let me know if you need more help with this!
Product Manager, MicroStation
Bentley Systems intl
Thanks for the prompt response Marco. i'm still having problems with this file (your amended version). I changed the width value to 2 metres and the frame does not respond properly. It just changes so some weird thing. I understand the need to set proper constraints but I would have thought that if I constrained the path for an extrusion and the modified the value the extruded geometry should follow?