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

[OpenSceneGraph Users]

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