On 21/03/10 16:27 , John Galt wrote:
> I'm trying to access a child node to perform Position Attitude
> Transformations but I
> am unable to figure out how to do so.
>
> My createModel(overlay, technique) is defined as follows:
>> ....
>> osg::Group* root = new osg::Group;
>> osg::Node* baseModel = createBase(osg::Vec3(center.x(), center.y(),
>> baseHeight),radius);
>> osg::Node* movingModel = createFrustumGeode(2,4,45,45);
>> {
>>
>> root->addChild(baseModel);
>> }
>>
>> root->addChild(movingModel);
>>
>> return root;
>> }
>
> My main function has this code:
>> ....
>>
>> // initialize the viewer.
>> osgViewer::Viewer viewer;
>>
>> // load the nodes from the commandline arguments.
>> osg::Node* model = createModel(overlay, technique);
>> if (!model)
>> {
>> return 1;
>> }
>
>
> Now at this point in my main function, I want to access the child node of
> model (say
> the"movingModel" node) and perform a position attitude transformation on it.
>
> How do I access it and perform the transformation? Any suggestions would be
> welcomed by this newbie.
To get to the 'movingModel' node you could either access it by its index (like
model->getChild(1)' or write a visitor to find it by name.
You can then dynamic_cast this to PositionAttitudeTransform and perform the
desired
operation. (The node has to be created as a PAT; it's not obvious what
'createFrustumGeode' creates.)
Cheers,
/ulrich
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