Hi, You're right !! cross product is null ... I don't know why but now I know where is the problem.
Thanks :) Vincent. 2008/3/13, Vican, Justin E. <[EMAIL PROTECTED]>: > > What are the values of _NodeTranslation and_NodeTranslationStart? If > that cross product returns a zero vector (0,0,0), a NULL rotation will be > computed. > > > > *From:* [EMAIL PROTECTED] [mailto: > [EMAIL PROTECTED] *On Behalf Of *Vincent > Bourdier > *Sent:* Thursday, March 13, 2008 12:55 PM > *To:* osg > *Subject:* [osg-users] Matrixf and Quat problem > > > > Hi, > > I am trying for hours to make a rotation with two vectors... > > The code is : > > osg::Matrixf MR = osg::Matrixf::identity(); //matrix rotation > MR.rotate(angle*osg::PI/180.0, _NodeTranslation^_NodeTranslationStart); > osg::Quat qrotation = osg::Quat(); > qrotation.set(MR); > _rotation *= qrotation; > > cout<<"Rot : "<<qrotation.x()<<" "<<qrotation.y()<<" "<<qrotation.z()<<" > "<<qrotation.w()<<endl; > > > > And in the console, the result is : > > Rot : 0 0 0 1 > Rot : 0 0 0 1 > Rot : 0 0 0 1 > ... > > I've checked 'angle' and it is a good value, always increasing... > > Is there any problem in my code ? Why the Quat doesn't change... ? > > Thanks, > > regard, > Vincent > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > >
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