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johnPGNFG
280 Views, 3 Replies

How can I tell if an arc curves inwards or outwards?

How can I tell if an arc curves "into" a part or "out of" a part using the edge?  

 

For example, how could I identify the curve on the left (curving in) as -1 and the curve on the right (curving out) as +1?

 

I extracted the ArcData but can't seem to find a way I can use this to tell which way the arc curves.

 

Arc3d curve = edge.Geometry; 

curve.GetArcData(....);

cirinout.png