[osg-users] Get all vertices of an OSG Group

[Robert Osfield]

Hi Clement+Tony,

On 26 March 2016 at 02:16, Tony Vasile <minghia at gmail.com> wrote:

> Hi Clement,
>   This is rather easy to do. All you need is to define a NodeVisitor and
> run it on the group. Using this way you only need to have an accept call
> for the Geode and process the drawables under the Geode.
>
> Code:
>
> class InfoVisitor : public osg::NodeVisitor
> {
> public:
>     InfoVisitor()
>     {
>         setTraversalMode( osg::NodeVisitor::TRAVERSE_ALL_CHILDREN );
>     }
>
>     void apply( osg::Geode& geode )
>     {
>         for ( unsigned int i=0; i<geode.getNumDrawables(); ++i )
>         {
>            // Do what you have to do, for example store in a data structure
>         }
>     }
> };
>


In OSG-3.4 onwards osg::Drawable subclasses from osg::Node (this also means
osg::Geometry is a Node as it subclasses from Drawable) so can now be used
directly in NodeVisitor so you can implement:

class InfoVisitor : public osg::NodeVisitor
{
public:
    InfoVisitor() :
osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN ) {}

    void apply( osg::Geometry& geometry )
    {
           // Do what you have to do, for example store in a data structure
    }
};

As Drawable/Geometry is a Node you don't actually required osg::Geode so
the above revision will handle new and old style subgraphs.

Robert.
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