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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