Thanks Paul, Those questions were indeed closely related. Yet since I'm not planing to use slave cameras for the moment I guess I'm better of with my "node cullcallback to update uniforms", at least I will try that.
Cheers, Manu. 2010/1/29 Paul Martz <pma...@skew-matrix.com> > I recommend you search the archives for the recent thread "Uniform per > slave Camera". Several solutions, including the solution I eventually used, > are discussed in that thread. > > Paul Martz > Skew Matrix Software LLC > _http://www.skew-matrix.com_ <http://www.skew-matrix.com/> > +1 303 859 9466 > > > > Emmanuel Roche wrote: > >> Hi everyone, >> >> I'm facing a problem I cannot solve by myself here, I thought I could just >> ask: >> >> - I have a scene (so a scene graph) >> - I use multiple View on this single scene >> >> --> Currently I have an "homemade" mixture of customized osgViewer::Viewer >> objects to deal with everything so basically, for each View, I go through a >> complete (EventTraversal(), UpdateTraversal(), RenderingTraversals() ) loop >> sequentially. >> >> - Now I would like to switch to a CompositeViewer and thus go through the >> event/update traversals only once per Scene (If I understand the >> CompositeViewer design properly). >> >> But I have a very specific problem to solve here: >> >> In my scene graph I use shaders and uniforms. those uniforms have update >> callbacks, and in those update callbacks, I retrieve my currently rendering >> View and then the View matrix to generate eye coordinates. >> >> --> I assume using the osg_ViewMatrix uniform is not an option for me >> because I need to convert very big position vector and very big view matrix >> translation, and I would clearly get a problem here if I don't have double >> precision. >> --> With the CompositeViewer I can't access the individual "View" anymore >> in the update traversal() since this process is "View agnostic" I would say. >> >> >> --> Since my views will need different settings for the uniforms, I was >> thinking I would just need to do something in the cull traversal, but here I >> realized something which seems strange to me: there is no such method as >> uniform::setCullCallback(...) >> >> So, the question is, how would you update your uniforms properly in that >> case ? >> >> I mean, I could still put a cullcallback on the node owning the stateset >> containing the uniform for instance and "update" from here (assuming I can >> retrieve the Viewmatrix I need somehow in that Cullcallback...) but is this >> really the best option ?? >> >> - And generally speaking, would a uniform::setCullCallback() not make >> sense for some reason I'm apparently missing for now ? >> >> Bonus question by the way: How would I access the "master camera" >> ViewMatrix in a cullcallback ? i've seen we have >> osgUtil::CullVisitor::getCurrentCamera() but would this return the Master >> camera of the View or just the current camera in the scene graph (as I use >> DepthPartitionNode I have many sub cameras in my scene...) >> >> Thanks in advance is someone has any tip/advise/complete solution on those >> questions! >> >> Regards, >> Manu. >> >> >> ------------------------------------------------------------------------ >> >> >> _______________________________________________ >> osg-users mailing list >> osg-users@lists.openscenegraph.org >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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