I've been trying to use the SphericalManipulator class that was posted
to the submission list a few weeks ago and it is throwing exceptions
when it is trying to calculate acos(1.00000000002) in the last line of
this function:
void SphericalManipulator::setByMatrix(const osg::Matrixd& matrix)
{
_center=osg::Vec3(0,0,-_distance)*matrix;
_azimuth=atan2(-matrix(0,0),matrix(0,1));
if(_rotationMode != MODE_2D)
_zenith=acos(matrix(2,2));
}
In my code, the matrix parameter is created by an inverse operation.
In general, is there some way to avoid this problem, or do I need to add
code that range checks critical values? Should the last line be changed
to this block:
double val = matrix(2,2);
if ((val >= 1) || (val <= 1)) zenith = 0;
else zenith = acos(val);
Yuck.
Cory
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