[osg-users] Edit 3D (osgt) model to add DOFTransform and perform "node" rotation

[OpenSceneGraph Users]

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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