RE: RE: [Openvrml-develop] Using OpenVrml for a simulation

[<luc...@li...>]

After some more investigation i found that the member variable d_v in 
a  VrmlMFNode object should contain a list of pointers to its sons.
This member is private so it is not accessible from client programmers.
Should i add a method to the VrmlMFNode to return its sons or is there 
another way to get access to a Node' sons?

Thanks
Luca



Ur Answer is clearing some points and is very 
helpful.
Anyway probably my first question is not well 
formulated: I should have the ability to parse 
all nodes in the Vrml scene graph , not just 
DEFined nodes.

Taking a look at this code:

VrmlMFNode * VrmlScene::readWrl(Doc2 * tryUrl, 
VrmlNamespace * ns)
{
    VrmlMFNode * result =3D 0;
    
    theSystem->debug("readWRL %s\n", tryUrl->url
());
    
    // Should verify MIME type...
    istream & istm =3D tryUrl->inputStream();
    if (istm) {
        
        Vrml97Scanner scanner(istm);
        Vrml97Parser parser(scanner);
        
        //
        // If the caller is not interested in 
PROTO defs, use a local namespace.
        //
        // Note: Can we displace the 
responsibility for this to the caller? Here
        // we instantiate a VrmlNamespace whether 
or not we need it. That could
        // be avoided with new/delete, but the 
resulting code would be awkward
        // and hard to follow. Why not instead 
have the caller pass in a
        // reference to a namespace, and let the 
caller decide whether or not a
        // new namespace should be instantiated?
        // -- Braden McDaniel 
<<EMAIL: PROTECTED>>, 30 Mar, 2000
        //
        VrmlNamespace nodeDefs;
        VrmlNamespace * rootNamespace =3D ns ? ns : 
&nodeDefs;
        
        result =3D new VrmlMFNode();
        try {
            parser.vrmlScene(*result, 
*rootNamespace, tryUrl);
        } catch (std::exception & ex) {
            cerr < ex.what() < endl;
        }
    }
    
    return result;
}

it seems to me that all the parsed scene graph is 
collected in VrmlMFNode * result so i would like 
to know how to parse the resulting tree.

I dont know if i am right since i didnt have the 
time to dig deeply in the library code ( and this 
is an hard task given the amount of code ) but to 
me this ipothesis makes sense even if probably i 
am wrong.
So put in a few word the question is:

if i run something like this:

parser.vrmlScene(*result, *rootNamespace, tryUrl);

is all the World scene graph returned in *result?
How to traverse the resulting object graph?


Greets
Luca