[osg-users] rotate a arrow to a point

2010-04-20 Thread Lv Qing 
Hi,

I have create a arrow up to the sky ,its position is OSG::Vec3(x,y,z),its 
rotation is osg::quat quat1(osg::degreetoradians(90.0)*osg::Vec3(0,0,1)).


I　ｊｕｓｔ　ｗａｎｔ　ｔｏ　rotate 　ｔｈｉｓ　arrow 　，ｍａｋｅ　ｉｔ　ｐｏｉｎｔ　ｔｏ　ａｎｏｔｈｅｒ　
point（ｏｓｇ：：Ｖｅｃ３（ｘ１，ｙ１，ｚ１））．



Thank you!

Cheers,
Lv

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Re: [osg-users] rotate a arrow to a point

2010-04-20 Thread Trajce (Nick) Nikolov 
it is easy

let say your point is  osg::Vec3(x,y,z) and by default your arrow is poining
up osg::Vec3(0,0,1), then

osg::Vec3 point(x,y,z)
osg::Node* arrowPointingUp = 

osg::Quat q;
osg::Vec3 a = point.
a.normalize();
q.makeRotate(osg::Vec3(0,0,1),a);

osg::MatrixTransform* mxt = new osg::MatrixTransform;
mxt-addChild(arrowPointingUp);
mxt-setMatrix(osg::Matrix::rotate(q));

-Nick


On Tue, Apr 20, 2010 at 4:06 PM, Lv Qing donlvq...@msn.com wrote:

 Hi,

 I have create a arrow up to the sky ,its position is OSG::Vec3(x,y,z),its
 rotation is osg::quat quat1(osg::degreetoradians(90.0)*osg::Vec3(0,0,1)).


 I ｊｕｓｔ ｗａｎｔ ｔｏ rotate ｔｈｉｓ arrow ，ｍａｋｅ ｉｔ ｐｏｉｎｔ ｔｏ ａｎｏｔｈｅｒ
 point（ｏｓｇ：：Ｖｅｃ３（ｘ１，ｙ１，ｚ１））．



 Thank you!

 Cheers,
 Lv

 --
 Read this topic online here:
 http://forum.openscenegraph.org/viewtopic.php?p=27017#27017





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