Hi Andre,
On 25/06/10 1:06 , Andre Simoes wrote:
> I've made a main osg::Group with an osg::NodeCallback attached to call
> some stuff each update.
>
> inside my osg::NodeCallback i have:
>
> void
> MyCallback::
> operator()( osg::Node* node, osg::NodeVisitor* nv)
> {
> Frame *frame = (Frame*)node;
> if( ! frame->main_child )
> {
> frame->main_child = new osg::Group;
> frame->addChild( main_child.get() );
> }
> }
>
> The problem is that when it calls frame->addChild( main_child.get() );
> the program badly ends.
There might be two problems with the above code:
a) the 'node' might not be of the proper type in which case frame->main_child
could return all kinds of garbage; it's safer to use
Frame* frame = dynamic_cast<Frame>(node);
if (frame && !frame->main_child)
...
b) you might have a circular dependency, if main_child is a ref_ptr that is
owned by Frame
and also added as a child
Cheers,
/ulrich
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