Hi Robert,
If I understand well, getWorldMatrices() return one matrix per parental
path.
but if I want to get the world Matrix, the one which represent the node's
position and translation in absolute system, how can I do ? Which matrix I
have to get ?
I feel a little bit lost in theses matrices....
Thanks.
Regards,
Vincent.
2008/3/27, Robert Osfield <[EMAIL PROTECTED]>:
>
> HI Vincent,
>
> The getWorldMatrices() method returns accumulated world matrices, if
> there is more than one then it means you have multiple parental paths
> and that multiple world matrices are required to position the
> different instances. The getWorldMatrices() is not a list of
> matrices along a parent path and is not something you accumulate that
> you have done.
>
> I hope you grasp the difference as its hard explaining it without pen
> and paper. The key is you don't need to accumulate the matrices are
> completed, just use them directly.
>
> Robert.
>
> On Thu, Mar 27, 2008 at 1:53 PM, Vincent Bourdier
>
> <[EMAIL PROTECTED]> wrote:
> > Hi all,
> >
> > I make a little "up" of this topic because I'm now looking on it a last
> time
> > (I hope)
> >
> > To be more clear,
> >
> > I have a difference between getting the transform quat with theses two
> way :
> >
> >
> > osg::MatrixList ml = _node->getWorldMatrices();
> > osg::Matrixd Msum = osg::Matrixd::identity();
> > for(unsigned int i = 0; i< ml.size() ; i++)
> > {
> > Msum *= ml[i];
> > }
> > quat = Msum.getRotate();
> >
> >
> --------------------------------------------------------------------------------------------------------
> >
> > osg::PositionAttitudeTransform* pat =
> > dynamic_cast<osg::PositionAttitudeTransform*>(_node.get());
> > quat = pat->getAttitude();
> >
> > Do you know why I don't have the same result ?
> >
> > Thanks
> > Vincent.
> >
> >
> > 2008/3/21, Vincent Bourdier <[EMAIL PROTECTED]>:
> > > Hi,
> > >
> > > So I've made some tests and now I have some questions about the
> > differences between two methods to get tranformations on one node. Is
> the
> > node is a Transform or not, I use two different method to get
> > transformations.
> > >
> > > In the first method, I get directly the MatrixTransform node, so I can
> get
> > directly the matrix, convert it to Quat and continue...
> > > In the second method, I get a node, so I make a getWorldMatrices, and
> make
> > a product between all the Matrix of the MatrixList...
> > >
> > > If I test on a node, which parent is a MatrixTransform, it doesn't
> return
> > the same result with the two method (with the MatrixTranform as argument
> for
> > the first method and the child of the MatrixTransform as argument of the
> > second method)
> > >
> > > Is there any explanation for this difference ?
> > >
> > > Thanks.
> > >
> > > Regard,
> > > Vincent.
> > >
> > >
> > >
> > > 2008/3/21, Vincent Bourdier <[EMAIL PROTECTED]>:
> > >
> > > > Hi Robert,
> > > >
> > > > sorry I'm not always very ... understandable, when I try to explain
> > something.
> > > >
> > > > I've already tried getWorldMatrices() few days ago, but the result
> was
> > very different with using one PAT or MT Quat/Matrix...
> > > >
> > > > That's why I'm asking if getting the PAT/MT accumulation
> Quat/Matrices
> > is easy... or not.
> > > >
> > > > But if it getWorldMatrices() is the only solution, I'll will try
> again.
> > > >
> > > > Thanks.
> > > > Vincent.
> > > >
> > > >
> > > > 2008/3/21, Robert Osfield <[EMAIL PROTECTED]>:
> > > >
> > > > > Hi Vincent,
> > > > >
> > > > > I'm a bit confused about what you are trying to do, is it just get
> the
> > > > > accumulated world matrix at a specific node?
> > > > >
> > > > > If so then node::getWorldMatrices() is what you want. This will
> > > > > return a MatrixList, which will contain none, one or many matrices
> > > > > given that any node many have none or many parental paths
> containing
> > > > > transforms.
> > > > >
> > > > > Robert.
> > > > >
> > > > >
> > > > > On Fri, Mar 21, 2008 at 11:03 AM, Vincent Bourdier
> > > > > <[EMAIL PROTECTED]> wrote:
> > > > > > Hi all,
> > > > > >
> > > > > > I'm trying to get a node's parent as Transform (PAT or
> > MatrixTransform) but
> > > > > > I have to get the transformation in ABSOLUTE_RF...
> > > > > >
> > > > > > For the moment, I've done a recursive method to get Parent as
> > Transform. It
> > > > > > return me the first parent as Tranform it encounter.
> > > > > >
> > > > > > I've tried this :
> > > > > >
> > > > > > > osg::ref_ptr<osg::MatrixTransform> tmp_pt = new
> > osg::MatrixTransform;
> > > > > > > tmp_pt->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
> > > > > > > tmp_pt->setMatrix(p_mt->getMatrix());
> > > > > > >
> > > > > >
> > > > > > (where p_mt is my RELATIVE MatrixTransform)
> > > > > >
> > > > > >
> > > > > > But the method return to me a MatrixTransform in RELATIVE. It is
> > possible to
> > > > > > get the Matrix in Absolute ? without traverse all the
> scenegraph ?
> > > > > > Thanks.
> > > > > >
> > > > > > Regards,
> > > > > >
> > > > > > Vincent.
> > > > > >
> > > > >
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> > > > > >
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> > > >
> > >
> > >
> >
> >
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