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

[OpenSceneGraph Users]

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