Hi,
On Tue, 2004-10-05 at 23:22, Andreas Langs wrote:
> Hi,
>
> this time I solved or better got arround the following Problem, which might
> be interesting tough.
>
> I needed some Code to extract the rotation-part from a transformation Matrix
> as a Quaternion. The following Code-parts are part of a project I´m
> currently working on.
>
> The following V1 Code gives obviously the wrong result for the "rot" Matrix.
>
> V2 and V3 are working as expected, but i think they internaly also use the
> matrix::factor() function. Thats what I found interesting.
>
> Maybe someone could give me a hint, what i have done wrong in V1.
>
> These results were produced by the CVS Version from 29.08.2004 with .NET
> 2003
hmm either documentation problem or bad interface design seem to be the
major problem. From OSGMatrix.h
/*! \brief Factors a matrix m into 5 pieces: m = r s rt u t, where rt
means transpose of r, and r and u are rotations, s is a scale,
and t is a translation. Any projection information is returned
in proj.
*/
template<class ValueTypeT> inline
bool TransformationMatrix<ValueTypeT>::factor(TransformationMatrix &r,
VectorType3f &s,
TransformationMatrix &u,
VectorType3f &t,
TransformationMatrix
&proj) const
in short the problem is that the first parameter r is the scale
orientation not the rotation, u (third parameter) is the rotation. If
you change your testprogram to use u not r as the rotation you get
the same results as for the last two of your examples.
regards,
gerrit
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