I'll try to simplify the problem, because I think it is not easy to
understand what the problem looks like. (I know I need to wait ... but it
become urgent so I still stay trying ideas or waiting for yours)
Group
|
|_________________________
| | |
Dragger1 Selection1 Plane
|
_____|________
| |
Dragger2 Selection2
|
Geode
Dragger 1 is translation, Dragger2 is rotation
When I use/dragg Drager2, Selection 2 changes, and the node rotate.
What I need, is to get the transformation applied on the Geode, to set the
same on Plane. (same place, same orientation)
In the DraggerHandler, I get the Selection2 when rotating. So I copy matrix
before and after rotation to compute the rotation done and apply it to Plane
(osg::Plane).
So I do :
osg::Matrixd m = osg::Matrixd::translate(-afterMoving.getTrans()) *
(afterMoving * osg::Matrixd::inverse(beforeMoving)) *
osg::Matrixd::translate(afterMoving.getTrans());
Plane->transform(m);
(because Plane is not a geometry, no Transform can be apply on it.)
But the plane and the Geode not have the same orientation...
I don't understand where the calculs are wrong.
Thanks.
Regards,
Vincent.
2008/12/18 Vincent Bourdier <vincent.bourd...@gmail.com>
> Hi,
>
> Using the draggerHandler (the copy of the one in osgManipulator example) to
> rotate and translate a node, I need to get theses transformations to apply
> it to an other node.
>
> In the Handler, I get the previous matrix of the dragger, and after
> transformation (on release) I get the other matrix.
>
> If I print the values :
> *
> DISPVECT("relative trans", afterMoving.getTrans() -
> _beforeMoving.getTrans());
> DISPQUAT("relative rot ", afterMoving.getRotate() *
> _beforeMoving.getRotate().inverse());*
>
> It looks very good.
>
> Next, to apply theses transformation to an osg::Plane, I use this code :
> *
> osg::Vec3d trans = afterMoving.getTrans() - beforeMoving.getTrans();
> osg::Quat rot = afterMoving.getRotate() *
> beforeMoving.getRotate().inverse();
>
> //Create the transformation matrix to rotate and translate the plane. the
> plane has its center int the center of the Dragger
> osg::Matrixd m ;
> m = osg::Matrixd::translate(-beforeMoving.getTrans()) *
> osg::Matrixd::rotate(rot) * osg::Matrixd::translate(beforeMoving.getTrans())
> * osg::Matrixd::translate(trans);
>
> DISPVECT("relative plane trans", m.getTrans());
> DISPQUAT("relative plane rot ", m.getRotate());
>
> myPlane->transform(m);*
>
> The value applied are not the same !
>
> values returned :
> *relative trans : 0 0 0
> relative rot : 1.63503e-008 -0.461046 2.45062e-008 0.920392
> relative plane trans : 3081.37 -7.26342e-005 -3422.35
> relative plane rot : 1.58832e-008 -0.447874 2.38061e-008 0.894097*
>
> The translation result looks good, but the rotation is not exactly the good
> one...
>
> Do you have any idea of where to find why there is a difference ? May be a
> math problem, or a plane->transform not adapted to that kind of computation
> ... ?
>
> Thanks a lot.
>
> Regards,
> Vincent.
>
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