[ggt-devel] rotating a vector with an axisangle

[Stuart T. <st...@vi...>]

I got this from the GMTL FAQ:

gmtl::Vec3f myVec;
gmtl::AxisAngle myAA;
gmtl::Quaternion myQuat;

myVec = myVec * myAA;
myVec = myVec * myQuat;

I first tried it with an gmtl::AxisAnglef, then a gmtl::Quatf. Neither
seem to have an operator* for multiplying a Vec by an AxisAngle

I grep'd the src code to make sure. The only operator's I found were for:

VecBase<DATA_TYPE, 3> operator*( const Quat<DATA_TYPE>& rot, const
VecBase<DATA_TYPE, 3>& vector )

VecBase<DATA_TYPE, 3> operator*=(VecBase<DATA_TYPE, 3>& vector, const
Quat<DATA_TYPE>& rot)

so you could do myVec = myQuat * myVec;

But how could I rotate a vector by a AxisAngle? Do I just have to
convert it to a quaternion?

Basically, I want to rotate a particle theta degrees around an arbitrary
axis.

Thanks.
Stuart