After a break, have managed to get the join working correctly,
EXCEPT if Cancel is pressed, a copy of the airfoil remains. ???
Do not know why. "Null" is used.
Maybe has something to do with geometryDatabase?


Many portions of the SpurGearProfile script were used, with limited understanding.)
Do not know if a factory or factories array could be used instead?

Update attached.
The control points for the curve are showing, (not for mirror). This can be changed by commenting out 3 lines in the .js.

EDIT, Corrected update 1/15/2012, now Cancel button works properly.