Antonio Bleile wrote:
> Carsten Neumann wrote:
>> Hello Antonio,
>>
>> Antonio Bleile wrote:
>>> > You can override an Action's callbacks on a per instance basis
>>> > (registerEnterFunction, registerLeaveFunction), so you can create a
>>> > regular RenderAction and register a different callback for geometry.
>>> > That callback would basically do the same as the regular one, but only
>>> > after testing that the node has no children.
>>>
>>> OK, and here's the problem:
>>>
>>> Action::ResultE myTraverse(CNodePtr & Cnode, Action *action)
>>> {
>>> OSG::NodePtr node = action->getActNode();
>>>
>>> if( node->getNChildren() )
>>> return Action::Skip;
>>> else
>>> return Action::Continue;
>>> }
>> ah, well it is a bit more work than that ;)
>> You need to duplicate and modify the callback for Geometry, which is
>> MaterialDrawable::renderActionHandler (see below). In there you check
>> the node for children and if it has any you just return Action::Continue
>> otherwise do the usual thing:
>
> Mh... Not sure if I got it. That means I have to hardcode that into
> a custom OpenSG version? Don't see how I could register such a
> callback at run-time. Or derive a custom Geometry node...Mh... Ok, if
> it's not possible in a more elegant/dynamic way I'll have to do the
> whole thing a bit different.
There is nothing special about the modified callback I posted and it
need not be a member of MaterialDrawable. Just replace the body of your
myTraverse above with what I posted, add some casting to get the
material from a MaterialDrawable core and register it the same way you
posted. That should do the trick.
Am I missing something ?
Cheers,
Carsten
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