beam system direction

[rjjlee]

Is there a way to specify the direction that a beam faces? For example, I'm using beam systems to show C's and Z's in the roof structure... problem is that they're all facing the wrong way- the open end of the C purlins face the gutter instead of the ridge. Is there a way of specifying this anywhere? The 2 solutions I've come up with aren't very satisfactory:
1. Pick each purlin and flip the control arrows
2. Make a new mirrored purlin family...

Does anyone have any other ideas?

[rjjlee]

I've worked it out! The direction of the first line determines- if drawing a rectangle in a clockwise direction, the purlins face right, if drawn in an anti-clockwise direction, the purlins face left.