Do you need to have OSG recompute the near/far planes? If not, I would disable it if I were you, and instead use the top-level bounding volume in your computation of the global projection matrix.
I used to maintain an application that had OSG as well as other renderers. I did as described above: I created a projection matrix used by all renderers based on the bounding volumes of all geometry in all renderers, and I told the osgUtil::SceneView to not compute the near/far planes. (The bigger problem I ran into was managing state between all the renderers, but that's another thread.) Best of luck with this, -Paul > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > [EMAIL PROTECTED] > Sent: Tuesday, September 26, 2006 1:15 AM > To: [email protected] > Subject: [osg-users] Near/Far Clipping Plane when integrating > OSG withexternal renderers > > Hello, > > we would like to combine OSG with other renderers, which are > called independent from OpenScene Graph. The Problem is, that > for this to work, all renderers have to use the same near and > far clipping planes. > > To do this, we collect the near and far clipping planes, > required by the different renderers, before we start > rendering and combine them to an projection mMatrix, which is > then used by all renderers. > > At the moment I'm using osgUtil::SceneView to render the Scene Graph. > The problem is, that the clipping planes are calculated in > SceneView::cull. But after calling cull it seems to be > impossible to change the projection matrix again, as it is > already stored in the renderLeaf objects and a change has no > effect, before cull is called a second time. > > Is it possible to get the clipping planes independent from > the culling? > Or is it somehow possible, to change the projection matrix > after culling? Or would you generally recommend a completely > different approach to combine OSG with other renderers? > > We already considered integrating the other renderers in > Scene Graph nodes, but would prefer, to keep them apart to > reduce the dependence on each other. > > Best Regards, > Roland > _______________________________________________ > osg-users mailing list > [email protected] > http://openscenegraph.net/mailman/listinfo/osg-users > http://www.openscenegraph.org/ _______________________________________________ osg-users mailing list [email protected] http://openscenegraph.net/mailman/listinfo/osg-users http://www.openscenegraph.org/
