[Ves] Documentation for SetRotation in vesActor

[Aashish Chaudhary]

Dear Carlos,

Thanks for this information. I will add this clarification. I am wondering
if we should use degrees as well.

Thanks,



On Mon, Apr 1, 2013 at 10:28 AM, Carlos <ves at calculoandamios.com> wrote:

> Hi,****
>
> ** **
>
> I have been using:****
>
> ** **
>
>   /// Set rotation as described by angle (in radians) and axis****
>
>   /// ( axis(x, y, z), angle )****
>
>   void setRotation(const vesVector4f &rotation); ****
>
> ** **
>
> in vesActor class and sometimes it has a strange behavior.****
>
> ** **
>
> I wrongly assumed that the behavior was similar to the RotateWXYZ method
> in vtkActor but there are some differences:****
>
> ** **
>
> **·         **The first one is that the angle in setRotation is in
> radians instead of Degrees. This is explained in the comments so it is OK.
> ****
>
> **·         **The second one is that the axis in setRotation must be
> normalized. This is explained in the AngleAxis.h file from the Eigen
> package but not in vesActor. ****
>
>   /** Constructs and initialize the angle-axis rotation from an \a angle
> in radian****
>
>     * and an \a axis which \b must \b be \b normalized.****
>
>     *****
>
>     * \warning If the \a axis vector is not normalized, then the
> angle-axis object****
>
>     *          represents an invalid rotation. */****
>
> ** **
>
> If the axis is not normalized, then the rotation is done without errors
> but in a wrong way, affecting to the rotation angle and the scale of the
> object (I have not checked how but this is something I have experienced).*
> ***
>
> ** **
>
> I think it would be helpful if this comment is also included in the
> comments of the setRotation declaration (or maybe normalize the axis before
> passing it to the Eigen package).****
>
> ** **
>
> ****
>
> Best Regards,****
>
> ** **
>
> Carlos****
>
> _______________________________________________
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> Ves at public.kitware.com
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>
>


-- 
| Aashish Chaudhary
| R&D Engineer
| Kitware Inc.
| www.kitware.com
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