bagginsbill, have you checked out Jack Crenshaw's book "Math Toolkit for Real-Time Programming"?  This is really a dissertation on decades' long experience crunching complex mathematical routines into real-time embedded systems.  ArcTangent is covered in its own chapter. ;)

Now, just because this deals with embedded systems doesn't mean that something like old game approaches with limited angles and sin/cos tables.  Here, accuracy is just as important as well as error minimization.  This would need to be coded, unfortunately.  In nodes, it might be quite a few - a few constants (using tan() on two), abs(), and a significant amount of math for the nodes.  If there is a function node, this could reduce the overall node count.

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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