On Tue, 2008-11-04 at 10:53 -0500, Jean-Sébastien Guay wrote: > Hello Wang Rui, > > > They are tessellated at a given detail level, that is, they are all > > derived from osg::Geometry and can be regard as geometries. I know it is > > more efficient to use geometry shaders, but maybe it is more easier to > > save and modify data from vertices arrays, and make the library suitable > > for some low level grpahics systems. > > No, that's fine. It would be interesting to provide different rendering > implementation back-ends which could be switched at runtime. But doing > it as osg::Geometry is fine as a first step. > > > I'm just considering to write a plugin to read curve/surface data file. > > Do you know any format that supports parametric curves/surfaces? Does > > .osg format support them? > > You can add whatever you want to the .osg format. Have a look at the > osgWidget .osg plugin for example, it's a good example of extending the > .osg format to support new types of objects.
Everything that's in the osgWidget plugin loader is just a skeleton for future use, so it would be a great place to start to look and see how it's done. Just remember, you'll want to dyn_cast<>() your osg::Object reference to something you can set values on as you read, and as you write. > J-S _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
