Hi Wojtek,
I'm so sorry that I replied too late. I was held up by my paper's submission
deadline. And the problem I think is solved.
Thank you very much.
Cheers,
Jiechang
Wojtek wrote:
> Hi Jiechang,
>
>
> I am not sure I am able to pinpoint your problem. I see some weak spots but I
> am not sure if those are the true causes of your problem. And don't want to
> give wrong clues. Can you write short repro program which demos your problem
> ? I may then fix it and send you back.
>
>
> To learn you may try to separate rotations and translations by using two
> matrix transforms above loaded model.
>
>
> MatrixTransformTranslate->MatrixTransformRotate->Object.
>
>
> Apply only rotations to MatrixTransformRotate
> and translations to MatrixTransformTranslate.
>
>
> Cheers,
> Wojtek
>
>
>
>
>
>
> 2017-05-06 8:51 GMT+02:00 Jiechang Guo < ()>:
>
> > Hi Wojtek,
> > First, Thank you very much for your detailed reply.
> > 1. It's my mistake to say rotation around Y axis, I always think the z axis
> > is actually the y axis.
> > 2. The origin variable is
> > osg::Matrix origin = model1->getMatrix();
> > I update this variable everytime when I translate or rotate the model. And
> > multiply it with my transform matrix so that I can get the correct result
> > after changing the position or orientation the model many times. Please
> > Correct Me if I'm not correct.
> > 3. OMG..I tried what you told me to. I just... I think I undestand what's
> > going on in side the constructor. No wonder I got that results and some
> > previous work about trackball rotate I did is wrong. Thank you.
> > 4. I've done some experiments about the order of the origin matrix. I get
> > the same result either I multiply it at first or at last...
> > The code is below:
> > osg::ref_ptr<osg::MatrixTransform> model1 = new osg::MatrixTransform;
> > model1->addChild(osgDB::readNodeFile("E:\objdata\FEMUR.obj", a));
> > osg::Matrix origin = model1->getMatrix();
> > model1->setMatrix(origin*osg::Matrix::translate(100, 0, 0));
> > osg::Vec3 Center = model1->getBound().center();
> > origin = model1->getMatrix();
> > osg::Quat quat(osg::PI_4, osg::Z_AXIS);
> > model1->setMatrix(origin*osg::Matrix::translate(-Center)*osg::Matrix::rotate(quat)*osg::Matrix::translate(Center)*osg::Matrix::translate(100,
> > 0, 0));
> >
> > The reason that I want to get the Trans() and Rotate() is that I'm
> > doing a task: Compute the deviation of the origin model and target model.
> > These two model are the same and when the origin model is being manipulted
> > to the position of target model(which is a mesh model) I have to compute
> > whether they are overlaped and skip to another task.
> > Actually, I've already implemented this function, but I was confused by:
> > when I do only rotate task, the trans I get from getMatrix().getTrans() is
> > changing. I even don't know why it works when I only compute the trans
> > deviation. The code is below.
> > model1Translation = m1.model->getMatrix().getTrans();
> > model1Quat = m1.model->getMatrix().getRotate();
> > model2Translation = m2.model->getMatrix().getTrans();
> > model2Quat = m2.model->getMatrix().getRotate();
> > osg::Vec3 positionbias = model2Translation - model1Translation;
> > osg::Quat rotationbias = model2Quat - model1Quat;
> > if (abs(positionbias.x()) <= 2 && abs(positionbias.y()) <= 2 &&
> > abs(positionbias.z()) <= 2)
> > {
> > //if (abs(rotationbias.x())<=0.1&&)
> > //{
> > hm->pressNext();
> > //}
> > }
> >
> > Cheers,
> > Jiechang
> >
> > ------------------
> > Read this topic online here:
> > http://forum.openscenegraph.org/viewtopic.php?p=70887#70887
> > (http://forum.openscenegraph.org/viewtopic.php?p=70887#70887)
> >
> >
> >
> >
> >
> > _______________________________________________
> > osg-users mailing list
> > ()
> > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
> > (http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org)
> >
> >
> >
>
>
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