On Wed, Apr 4, 2012 at 8:58 PM, Felix Nawothnig <[email protected]> wrote: > 2012/4/3 Robert Osfield <[email protected]>: >> Having mixed front face/back face within a single subgraph is not >> ideal. I would generally recommend that one should build/optimize a >> scene graph so that the as much work as possible is done as >> pre-processing/optimization/scene graph construction stage that >> minimizes the number of state changes - in your case avoid if possible >> all the osg::FrontFace entries in a subgraph by flipping the actual >> triangles so that they are all consistent in orientation i.e. all >> front face or all back face. > > Well yes - but this is not possible when the same triangles are > rendered with both orientations (i.e. when they can be reached > through parental paths with both positive and negative determinants in > the MVM)? > > The only thing one could do would be to duplicate the geometry... > which is not really an optimization. > Is it only the parent roots that introduce the mirroring? If so, you could attach a state set with the appropriate cull face setting to the transform node that causes the mirroring.
Tim > Felix > _______________________________________________ > 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
