Re: [openvrml-develop] shared_ptr<scope> and scope*

[Braden M. <br...@en...>]

Braden McDaniel wrote:
> Murashov Gleb wrote:
>>  
>> On Wed, 2008-07-23, Braden McDaniel wrote:
>>> node_type::create_node is a rather low-level operation from OpenVRML's
>>> perspective. That is not to say that you shouldn't be using it; just 
>>> be aware that browser::create_vrml_from_stream may be an appropriate
>> alternative.
>>
>> I've used browser::create_vrml_from_stream successfully, but I can't
>> understand, which scope got created node.
>>
>> 	field_value_listener< mfnode >& fvl_add =
>> group_node->event_listener< mfnode >("addChildren");
>>
>> 	std::stringstream sss;
>> 	sss << "DEF main_TS TouchSensor {}";
>> 	mfnode::value_type nodes_for_mfnode =
>> browser.create_vrml_from_stream(sss);
>>
>> 	mfnode mfn(nodes_for_mfnode);
>> 	fvl_add.process_event(mfn, 0.0);
>>
>> 	...
>>
>> 	node* f_n = root_scope.find_node("main_TS");
>> 	// f_n == 0 :(
>>
>> TouchSensor is created and works, but created node doesn't appear in
>> root_scope. Where can I find that? Is there any possibility to manage
>> this?
> 
> openvrml::scope corresponds to a lexical scope for DEF/USE names. As 
> such, the nodes created from create_vrml_from_stream have their own root 
> scope that is distinct from the scene's. The only way to get to this 
> scope is through a node (i.e., openvrml::node::scope).

I was very tired when I wrote the above response. In case it's not 
clear, you can get the root scope associated with the nodes read from 
the stream as follows:

   const openvrml::scope & s = nodes_for_mfnode[0]->scope();

You can then use openvrml::scope::find_node on s as you do with 
root_scope in the code above.

Of course, if all you want is a pointer to main_TS, 
"nodes_for_mfnode[0]" is a perfectly reasonable way to get it (in this 
case).

-- 
Braden McDaniel                      e-mail: <br...@en...>
<http://endoframe.com>               Jabber: <br...@ja...>