Re: [ggt-devel] rotating a vector with an axisangle

[subatomic <ke...@su...>]

try reversing the order?

On 9/23/06, Stuart Tett <st...@vi...> wrote:
>
> 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
>
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-- 
Kevin Meinert
http://www.subatomicglue.com