Hi Fabien, I suspect there is a couple of issues here. First up .ive doesn't support sharing of vertex arrays, it's not a particular common need which is probably why no one else has highlighted this requirement or step forward to implement. Adding won't be particularly difficult as sharing of Nodes, Drawables and State is already supported, but it'll require a increment of the ive version internal number/and careful handling of backwards compatibility. Same applies to .osg. Feel free to dive in and help implement it.
The other issue is that your .dae model is just 3Mb while the output .ive is 250Mb, this screams to me that you have shared arrays in separate geometry, whereas your model really should be setup as a small number of geometry without shared arrays. I haven't had a chance to look at your model - I have a full inbox so am just skimming right now, but I'd suggest you have a look at how many primitives are in each geometry. Robert. On Mon, Aug 11, 2008 at 11:48 AM, Fabien Dachicourt <[EMAIL PROTECTED]> wrote: > Hi all, > Using osgconv on some DAE models to procude IVE files sometimes really > increase the vertex count (and file size) > I'm not talking about texture problem, but about geometry and vertex. > > It seems the problem appear when vertex arrays are shared in the DAE model > (in a mesh entity) between several geomerties using distinct materials. > When the DAE file is loaded in OSG, it seems ok, it looks like everything > remains shared. > But when we write the node (to IVE or OSG for instance, but it seems it > appears in other formats too), the shared vertex array seems duplicated for > each geometry, including useless vertex : it dramatically increase the > object size (from 3 Mb to 250 Mb in my example). > > Using "osgconv --simplify 1", we remove useless vertex and the problem is > almost solved. > > Regarding this problem, I'm wondering if there is something to improve in > OGS : > - To support shared vertex arrays (and normals/textures arrays..) between > geodes in OSG or IVE format > - To remove any useless array element when writing nodes > > See this example, > http://spaceyes.nerim.net/sample/sample_dae.zip > > Thanks in advance for your answers, > Fabien > _______________________________________________ > 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
