Re: [Plib-users] Custom Traversal

[Steve B. <sjb...@ai...>]

Devrim Erdem wrote:
> 
> > Devrim Erdem wrote:
> >
> > > I want to add pre and post draw callback functions for each node under a
> > > certain branch ( an flt model ). Since there are no callbacks for
> > > branches I need to traverse the branch to find all the ssgLeaf's.. Is
> > > there a ssgTraverse function or a class ?
> >
> > I'm not too thrilled about DRAW callbacks at the BRANCH level - because it'll
> > cause horrible grief if/when we get around to sorting leaf nodes by material
> > property (which would be a significant speedup in some cases).
> 
> I  have seen the previous postings. So how can I find the the ssgLeaf nodes under
> a branch ?

Well, you have ssgBranch::getNumKids(), ssgBranch::getKid(n) and ssgEntity::isAKindOf()

...so you have all the tools you need to walk down the tree checking nodes to see if
they are derived from ssgLeaf.  A simple recursive tree-walk can easily be put together
in a dozen lines of code.

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