[osg-users] how to judge if an object is in the frustum?

[John Lee]

HI, Nick.
Thank you so much for your answer.
I will try this. I have one more question. How to detect if a node's bounding box collision with the camera view frustum. Can i solve this problem with  osgUtil::CullVisitor?


Trajce Nikolov NICK wrote:
> somthing like this:
> 
> struct MyCullCallback : public osg::NodeCallback
> {
>     void operator()(osg::Node* node, osg::NodeVisitor* nv)
>     {
>         osgUtil::CullVisitor* cv = nv->asCullVisitor();
>         //osgUtil::CullVisitor* cv = dynamic_cast<osgUtil::CullVisitor*>(nv);
>         if (cv && cv->isCulled(node))
>         {
>             
>         }
>     }
> };
> 
> node->setCullCallback(new MyCullCallback);
> 
> 
> On Mon, Jun 27, 2016 at 9:15 AM, Trajce Nikolov NICK < ()> wrote:
> 
> > something like this:L
> > 
> > 
> > 
> > On Mon, Jun 27, 2016 at 9:12 AM, John Lee < ()> wrote:
> > 
> > > Hi,
> > > Thank you for your answer.
> > > i can't find this method asCullVisitor(). I am using osg 3.4.0.
> > > I am so sorry, and I am new to osg. So I wonder if  you can give me more hint.
> > > Thank you again.
> > > 
> > > 
> > > Trajce Nikolov NICK wrote:
> > > 
> > > > Try CullCallback, in there you can get the handle of the CullVisitor and do something like this in your callback:
> > > > 
> > > > 
> > > > CullVisitor* cv = nv->asCullVisitor()
> > > > 
> > > > cv->isCulled(node)
> > > > 
> > > > 
> > > > 
> > > > On Mon, Jun 27, 2016 at 8:30 AM, John Lee < ()> wrote:
> > > > 
> > > > 
> > > > > Hi,
> > > > > 
> > > > > I don't know how to judge if an object is in the frustum? I want to get which node is in the frustum.
> > > > > 
> > > > > Thank you!
> > > > > 
> > > > > Cheers,
> > > > > John
> > > > > 
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> > trajce nikolov nick
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