Hi Paul, I ran into this dillemna recently while working on an app and then again while working on the code for FLATTEN_STATIC_TRANSFORMS_DUPLICATING_SHARED_SUBGRAPHS. My solution was the same as Robert's: place your graph under a temporary Group node, then flatten it, then retrieve the child of the Group node whatever it may be.
Just setting the root Transform node to identity didn't appeal to me. The point of the optimization in all cases I have seen is to remove transforms from the modelview stack since they can cause a big performance hit in sufficient numbers. Even if the matrix is identity you would still have the performance hit unless OSG is smart enough to treat such a Transform like a Group. I hope this is useful, but it sounds like your situation might be more complicated than mine. - Terry > > Message: 14 > Date: Fri, 24 Oct 2008 15:53:47 -0600 > From: "Paul Martz" <[EMAIL PROTECTED]> > Subject: Re: [osg-users] Problems flattening static transforms > To: "'OpenSceneGraph Users'" <osg-users@lists.openscenegraph.org> > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; charset="US-ASCII" > > Thanks, I see the light now. > > I wrote my own FlattenStaticTransforms NodeVisitor to just fold the > transform into the geometry and set the transformation to identity; It works > great as long as all Transforms are MatrixTransforms. > > (It'd be nice if there were a virtual osg::Transform::setIdentity() method > to easily allow code to set any Transform Node to the identity. For example, > see Optimizer.cpp starting at line 1080. It makes sense for PATs and > DOFTransforms, but maybe not for Camera...) > -Paul > _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
