[ggt-devel] gmtl::Math::aTan2<float>() is broken

[Patrick H. <pa...@vr...>]

There is something wrong with gmtl::Math::aTan2<float>(float,float). 
Regardless of the values for fY and fX, it always returns NAN garbage, 
and fY and fX get munged *after* atan2f(3) is called.  I think it 
probably returns NAN regardless of the values of fY and fX, but I have 
not verified this.  I have verified that the resulting values are always 
0 no matter what the input matrix contains.

I have tried changing the parameters to be const, but it doesn't make any 
difference.  I do not know how atan2f(3) could be modifying its parameters.

The code that exhibits this problem is as follows:

    gmtl::Vec3f xyzAngles;
    gmtl::Matrix44f* wand_matrix;
    wand_matrix = mWand->getData();
    gmtl::getRot(*wand_matrix, xyzAngles[0],  xyzAngles[1], xyzAngles[2],
                 gmtl::XYZ);

I sincerely hope something is wrong with the above and not with the Linux 
math library.


  -Patrick


-- 
Patrick L. Hartling                     | Research Assistant, VRAC
pa...@vr...                | 2624 Howe Hall -- (515)294-4916
http://www.137.org/patrick/             | http://www.vrac.iastate.edu/