On Fri, Aug 24, 2012 at 9:24 AM, Alexej Fink <[email protected]> wrote: > > gwaldron wrote: > > > > No, you need to apply it on the drawables, otherwise they will still get > culled. > > > > > > I created some utilities to support DrawInstanced usage in osgEarth, > including a visitor that will apply the static bounding box to drawables. > Perhaps it would be useful to you: > > > > > > > http://github.com/gwaldron/osgearth/blob/master/src/osgEarth/DrawInstanced( > https://github.com/gwaldron/osgearth/blob/master/src/osgEarth/DrawInstanced.cpp > ) > > > http://github.com/gwaldron/osgearth/blob/master/src/osgEarth/DrawInstanced.cpp( > https://github.com/gwaldron/osgearth/blob/master/src/osgEarth/DrawInstanced.cpp > ) > > > > > Do I understand your approach right: That you set the same "static" bbox > for each drawable by setting the same calcBBox callback for a group of > Drawable instances? > > If so. Although this is an other interesting work around. It still does > not reduce the culling effort visiting each Drawable instance, which I > would like to avoid, since it is meaningless in my setup -- culling on the > parent group node would be sufficient. Can I use some cull-callback to > prevent the culling visitor to go deeper to the single Drawables and cull > based only on the group node bbox?
Look at CullVisitor::apply(Geode&) to see how it works. I believe your drawables have to return a valid bound since CV uses that to calculate near/far clipping planes, renderleaf depth, etc.
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