Hi Paul, I'm just online briefly so I'll give you my first thought as what is amiss. Optimizer::optimize() method takes a reference to the scene graph to optimize, this means that it can't change it's type, so it can't flatten it. If you place a Group above it and then optimize it'll be able to optimize the node away.
One could possibly write an additional method that takes a pointer to a scene graph node and then return the new scene graph with potentially a new root node. For compatibility we'd need to keep the present one. Robert. On Fri, Oct 24, 2008 at 8:24 PM, Paul Martz <[EMAIL PROTECTED]> wrote: > Hi all -- I have a scene graph containing multiple static transforms. My > application runs the osgUtil::Optimizer on this scene graph. This should > flatten all the static transforms. Unfortunately, the result is that all the > transforms flatten _except_ for the top level transform. If I do an osgconv > on this same scene graph, all the static transforms flatten -- they are > converted to Group nodes, and their transformations are folded into the > geometry. Clearly, the issue isn't with the scene graph itself, but it's > something my app is doing wrong when it invokes the Optimizer. My dilemma: > why doesn't this work properly for osgconv, but not for my app? > > I have dug into thisu for quite some time now, trying to uncover the > difference between osgconv (which works) and my code (which doesn't work). > Here's what I know so far: > > * I've written a small test app to try to reproduce the problem. It loads > the scene graph, runs the Optimizer, and writes the scene graph back out. > Unfortunately, it works properly, just like osgconv. It flattens all the > transforms. I'm unable to reproduce the problem in anything other than my > (larger) application. This must be a bug in my code, I must be doing > something wrong. > > * I have verified that the problem is not non-STATIC transforms, multiple > parents, or ProxyNodes. The same scene graph works fine in osgconv and my > little test app, so it isn't a scene graph issue. I believe my app handles > the scene graph the same as in these other two apps, which work. > > * Yes I'm invoking the Optimizer the same way, with no flags. I'm sure that > the OSG_OPTIMIZER variable is not set in the environment. I get the same > behavior if I just pass the FLATTEN_STATIC_TRANSFORMS flag (top level node > fails to flatten). If I set OSG_OPTIMIZER=FLATTEN_STATIC_TRANSFORMS and run > osgconv, it still works properly and flattens all transforms. > > * ObjectStruct has a Boolean called _moreThanOneMatrixRequired. In my app, > this gets set to true at Optimizer.cpp line 826. This doesn't happen when > running osgconv or my small test code. This seems to be part of the problem, > but the root cause that triggers this event is still unknown to me. > > I'll attach the scene graph in question, though I doubt it will do anyone > much good, because it works fine in osgconv and my simple test app. It only > fails in my larger app. Note the top level Node named "CenterOfMassOffset"; > this is the transform that refuses to flatten. > > I'm wondering if anyone has encountered the same issue before, has any info > on how to resolve the issue, or might know how to proceed with debugging it. > Notify level DEBUG_INFO does not produce any enlightening information. > > I admit I'm stumped on this one. It's extremely out of the ordinary when OSG > doesn't just do what I expect it to. I appreciate any info. > > Thanks, > > Paul Martz > Skew Matrix Software LLC > http://www.skew-matrix.com > +1 303 859 9466 > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
