I've located my problem, and this time I don't know why it doesn't change anything...
osg::Matrixf MR = osg::Matrixf::identity(); MR.rotate(angle*osg::PI/180.0, rotaxis); note : rotaxis : 0.03, 0.0000006, -0.99 angle = 19.78 result : MR = identity... Is it me who make mistakes ? or there is a real problem ? Thanks, Vincent 2008/3/14, Vincent Bourdier <[EMAIL PROTECTED]>: > > 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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