Wouldn't that just be the angle between the line's direction and the plane's normal?
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angle between gp_Pln and gp_Lin
I can't seem to dig up a function that computes angles between a gp_Lin and gp_Pln. Its almost impossible to be a 100% whether its part of the API or not... perhaps anyone can help me remember ;)
-jelle
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Oops! I'm sorry for the brainfart...
Thanks Paul