Hi Sven,
Sven Widderich wrote:
> I have a problem to traverse a graph.
> There's an example of how to traverse a graph calling a class method
> at the end of the Traversal tutorial.
> I want to do the same but calling the traverse function within a method of
> the class.
>
> // This is some method within the class CLattice:
> traverse( _root,
> osgTypedMethodFunctor1ObjPtrCPtrRef
> <Action::ResultE, CLattice, NodePtr>
> (this, &CLattice::extendVolume) );
>
> The difference to the example on opensg.org is the 'this' pointer
>
> // Following is the method that should be processed when entering a node:
> Action::ResultE CLattice::extendVolume( NodePtr& nod )
> {
> // this tests if the core is derived from geometry
> if( nod->getCore()->getType().isDerivedFrom(Geometry::getClassType()) )
> {
> //...
> }
>
> return Action::Continue;
> }
>
> When testing whether the node has a geometry core, I get a null pointer
> exception.
>
> Somebody see my mistake?
hm, no sorry. Is it possible that you have a Node without NodeCore in
your scene? If that's the case the nod->getCore()->getType() call would
crash. Can you provide a backtrace of the crash, so we have a better
chance of seeing where exactly you get that null pointer?
Thanks,
Carsten
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