Forums >> Revit Building >> Technical Support >> Why does my family automatically flip?

archie456

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Joined: Mon, May 17, 2010
181 Posts

Hi,

I’m making a rather complicated door, and so simplify things I thought I’d make the 2D swing annotation symbol a nested family which I could easily change.

The swing annotation is an arc drawn between a reference plane and a reference line (the reference line is fixed at one end and ‘pivots’ around via an angle parameter.

This work, for angles upto 90 or so, but above that, the arc occasionally jumps to the other side of the angle reference lines.

You can see this from the attached file, currently the arc is 61 degrees, if you change it to 146 degrees the arc will flip to the opposite side. (You can also see the problem by manually dragging the end of the reference line around.

Any ideas why this is happening and how I can stop it??

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