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

[OpenSceneGraph Users]

Hi Jeremy,
editing your helicopter.osgt should work, and while I never work with
osgSim::DOFTransform
(I alway use osg::MatixTransform) both descend from osg::Group, and can be
used in osg text files to replace a group.
However, the optimizer might find a transform with an identity matrix, and
optimize it to a Group again.
To test your edits, use these commands:
  set OSG_OPTIMIZER=OFF
  osgconv helicopter.osgt rw_test.osgt
  winmerge helicopter.osgt rw_test.osgt
You should find all default values filled in the  rw_test.osgt.

Laurens.


On Wed, Apr 15, 2020 at 10:17 PM OpenSceneGraph Users <
osg-users at lists.openscenegraph.org> wrote:

> 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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