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-users-boun...@lists.openscenegraph.org> On Behalf Of
OpenSceneGraph Users
Sent: Mittwoch, 15. April 2020 21:54
To: OpenSceneGraph Users <osg-us...@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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