Posted by Neil on Mar 06, 2012; 9:58am
URL: https://forum.jogamp.org/Issue-with-trigonometric-functions-tp3414394p3803153.html

>I realized that acos does not work properly.
> I know that the argument should be in radians .

Surely the result is in radians?  The argument is a cosine in the range [-1,1]

HTH
Neil