Revit System Families have various properties and abilities, particularly in placement and rotation. A plumbing family can be rotated in ways a generic model can’t, i assume this is the same for structural.
Are these WorkPlane based families? if so you can use a rhino plane for placement that could be rotated.
You are not able to place sloping columns on a
work plane, you could do that for beams after
they are created
structural columns that are slanted
are rotated WHEN BUILT BY REVIT
such that their local xy axis is oriented vertical
so if you look top down webs are vertical as shown in image
and the cross section rotation starts out at “0”
(just like in your image when you look top down on your structural columns in Revit are they also oriented web vertical)
this is the same for beams and is typical of most BIM software including
structural analysis software…
are you trying to rotate the columns such that the ends are pointing in a certain direction?
if so…then
say you wanted to orient the columns in the EAST WEST Direction
then you could find the best fit plane for each column and find the angle
between that and the EAST WEST plane and then change the cross section rotation as shown
Basically I have a set of slanted perimeter columns which need to be perpendicular to the façade (so each column will have a different cross rotation angle.)
All setting out is done in Rhino (centre lines of columns, facade etc.)
Do I need to set up planes for each column and transfer them over separately?
Also if it makes things easier I could make the slanted columns a ‘structural framing’ category in Revit which would allow me to make them ‘work plane base’. Would that simplify the process.
My last resort would be to bring them through as directshapes but that would be a bit of a shame.