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
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