Ok, I misinterpreted your previous post. AFAIR you can set a pivot-point for the PAT. (at least for the osgSim::DoFTransfrom).
If I’m mistaken, you need to put a transform in your change yourself.
hth
Sebastian
From: osg-users <osg-users-boun...@lists.openscenegraph.org> On Behalf Of
OpenSceneGraph Users
Sent: Samstag, 18. April 2020 17:06
To: OpenSceneGraph Users <osg-us...@googlegroups.com>
Subject: Re: [osg-users] Edit 3D (osgt) model to add DOFTransform and perform
"node" rotation
Sebastian
I'll experiment with removing the original group.
The original model structure doesn't include any transforms. So the structure I
am looking at right now is:
Group "Heli" -> MyNewPAT -> Group "Main_Hub" -> Geometry1 ... GeometryN
If the MyNewPAT either child or parent was an object that contain the
appropriate information such as pivot I could definitely extract that info and
apply it to the PAT, but unfortunately it's surrounded by Groups.
Maybe I could create both a transform and a PAT, but I would still need some of
that basic information to set its reference points.
I've attached an osgt example.
Thanks
Jeremy
On Saturday, April 18, 2020 at 6:53:10 AM UTC-4, OpenSceneGraph Users wrote:
Hi,
you’re on the right track. Issue 1 stems from the fact, that you are not
removing the original group or at least the childs you’re re-parenting (which
still has references to your nodes).
Concerning issue 2. If the parent is a transform, you obviously need to take
this into account. PAT has a setPivotPoint IIRC, but another option is to
structure your scenegraph as follows:
Group -> OrginalTransform/Parent -> YourNewPAT -> Geometry1 … GeometryN
So leave the transform an put your PAT inbetween. That should solve the offset.
If you’re still struggling with this, maybe supply a minimal osgt.
Cheers
Sebastian
From: osg-users <osg-user...@lists.openscenegraph.org <javascript:> > On Behalf
Of OpenSceneGraph Users
Sent: Samstag, 18. April 2020 01:38
To: OpenSceneGraph Users <osg-...@googlegroups.com <javascript:> >
Subject: Re: [osg-users] Edit 3D (osgt) model to add DOFTransform and perform
"node" rotation
Sebastian
Thank you for your patience and guidance. Programmatically definitely makes
sense and I did look into that a short while back. I was initially looking at
PositionAttitudeTransform. Now revisiting that approach, I understand why I
started to look in another direction. Here is the dilemma I've come across. All
is good until I try to assign a parent to the Transform
hive::display::FindNamedNodeVisitor fnnv("Main_Hub");
scene->accept(fnnv);
osg::ref_ptr <osg::PositionAttitudeTransform> autoTrans = new osg::
PositionAttitudeTransform();
//puts node and all children under transform
autoTrans->addChild(fnnv.getFoundNode());
//set the parent (this doesn’t seem completely right to me, but may be)
fnnv.getFoundNode()->getParent(0)->addChild(autoTrans);
issue 1) at this point it appears to create a duplicate object (node and
children) of the “Main_Hub” group;
issue 2) when I attempt rotation of the object it seems to be around the origin
of the model instead of the previous “pivot pilot”
I seem to be missing how to squeeze that transform between the parent and child
appropriately.
Jeremy
On Thursday, April 16, 2020 at 9:41:55 AM UTC-4, OpenSceneGraph Users wrote:
Hi Jeremy,
Yes programmatically. You simply create a Transform, DOFTransform, whatever
and set all the children of the original Group as childs of the new one
(transforms, as you surely know are groups too).
Lastly you want to want to set the parent as well. I haven’t used OSG in a
while, but this pattern for sure works.
If you have more questions fell free to ask.
Cheers
Sebastian
From: osg-users <osg-user...@lists.openscenegraph.org
<mailto:osg-user...@lists.openscenegraph.org> > On Behalf Of OpenSceneGraph
Users
Sent: Donnerstag, 16. April 2020 14:36
To: OpenSceneGraph Users <osg-...@googlegroups.com
<mailto:osg-...@googlegroups.com> >
Subject: Re: [osg-users] Edit 3D (osgt) model to add DOFTransform and perform
"node" rotation
Sebastian, I've used the nodevisitor to find the node by name, the node just
happens to be a osg::group. Could you explain what you mean by "replace them
with a DOF-Transform"? I'm optimistic that you mean programmatically. My
current approach is to replace it manually in the osgt file.
Thanks
Jeremy
On Thursday, April 16, 2020 at 7:14:18 AM UTC-4, OpenSceneGraph Users wrote:
Hi Jeremy,
As your geometry-parts are usually under a transform /group you can use a
NodeVisitor to collect those (Find the nodes by name) and replace them with a
DOF-Transform.
You could of course also mess with the osgt-files, but that would be a last
resort.
Cheers
Sebastian
From: osg-users <osg-user...@lists.openscenegraph.org
<mailto:osg-user...@lists.openscenegraph.org> > On Behalf Of OpenSceneGraph
Users
Sent: Mittwoch, 15. April 2020 21:54
To: OpenSceneGraph Users <osg-...@googlegroups.com
<mailto:osg-...@googlegroups.com> >
Subject: [osg-users] Edit 3D (osgt) model to add DOFTransform and perform
"node" rotation
First off, I hope everyone is staying sane and healthy during this pandemic.
I’m working with a collection of 3D models that have come from a variety of
different source but are now all in osgb format. For several of the models I’d
like to grab a “node” and apply rotation.
As I’m working through my understanding of the approach, I’ve created a simple
application that loads the model, traverses the scene, returns a pointer to the
“node”, casts to a DOFTransform and manipulate the “node” (DOFTransform).
Snippet:
FindNamedNodeVisitor fnnv("turret");
scene->accept(fnnv);
osg::ref_ptr<osgSim::DOFTransform> dofTrans = new osgSim::DOFTransform();
dofTrans =
dynamic_cast<osgSim::DOFTransform*>(fnnv.getFoundNode()->asTransform());
if(dofTrans != NULL)
//manipulate (rotate)
This approach works for the tank.osg model. Now I’m trying to apply this
approach to a different model (helicopter for example). When I access the
“node” of interest, “Main_Hub” which is an osg::Group I obviously can’t cast
that to a osgSim::DOFTransform. I’m trying to get an understand of how I can
change the model, now in osgt (readable) format, to a structure that can be
used. I’ve been using the tank.osg as a guide and attempted to recreate a
similar structure in the helicopter.osgt. I’m trying to take logical stabs in
the dark, in the helicopter model I’ve attempted to simply renamed the “node”
of interest from an osg::Group to osgSim::DOFTransform. The model still
displays correctly, but the cast to osgSim::DOFTransform returns NULL. I
thought there may be some required variables at are needed as part of the
osgSim::DOFTransform structure, so I began adding currentHPR, currentTranslate,
and currentScale and continued to add more bringing it in line with the
tank.osg example. Through all the attempts I still getting NULL when casting.
I’m looking for any guidance/suggestions/lessons learned on how to properly do
this.
Thanks in advance
Jeremy
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