Hi Robert, Thanks again for your reply.
I have been browsing the databasepager code and how it interacts with a plugin. Do I understand it correctly if I say: ????? The scenegraph on the simulation loop is pulling the data via the database pager from a plugin. The scenegraph request the database pager for new data (graph nodes). But what if I want the plugin to push the data to the simulation loop? How do I do that? Does the databasepager support that? Regards, Lambert. On Mon, 2007-09-03 at 13:46 +0100, Robert Osfield wrote: > Hi Lambert, > > The existing DatabasePager functionality can page over the network, > but this isn't an issue for the DatabasePager - its purely a function > of the net plugin that does the loading across the http. This means > paging and reading across the network are completely orthogonal and > can be mixed and matched at will. > > The Viewers already have support for adding and remove subgraphs from > the main scene graph via the DatabasePager. You needn't add your own > code as long as the database is set in a way that utilises > DatabasePager. > > You can write your own DatabasePager functionality, but it its likely > to be alot less work just to use the built in paging support, this way > the task for you is just how to build you database. Teaching you how > to reimplement existing functionality really is way beyond the level > of support I can provide for free. > > Robert. > > On 9/3/07, Lambert Verhagen <[EMAIL PROTECTED]> wrote: > > Hi Robert, > > > > Thank you for the quick response. > > > > I don't understand it completely. Must be me not questioning right ;-). > > > > What I want to develop is an application that: > > 1) reads data that may contain from scene data like new nodes that are > > moving (AddNode). This data feed may also result in a removeNode (since > > another application may have decided to remove it from the scene. The > > scene graph is constantly, dynamically changed. > > 2) has an Update-Cull-draw pipe, that runs synchronous (real-time) and > > in the update step reads data from the graph that is dynamically changed > > by step 1. > > > > For this I thought I need an a-synchronous database thread that read > > data from the network (other application) and fills the database at > > low(er) frequency. And I also need a fast synchronous thread that reads > > data from the database (this must be quick, so probably I need > > references to the database scene graph nodes). > > > > The applications like Viewer en CompositeViewer perform updates to the > > scene graph via NodeCallbacks that are called from the same thread as > > the update-cull-draw thread is running. Isn't it???? > > > > Hope you can me further. > > > > Regards, > > Lambert > > > > On Mon, 2007-09-03 at 09:52 +0100, Robert Osfield wrote: > > > Hi Lambert, > > > > > > The OSG has the osgDB::DatabasePager which sole purpose is to do > > > multi-threaded paging of databases. The osgViewer::Viewer and > > > CompositeViewer both support it out of the box, as did > > > osgProducer::Viewer before it. There is nothing you need to do in > > > your app other than load a paged database. Paged dabases in the OSG > > > are ones that contain osg::PagedLOD node or loaded via the TXP plugin. > > > > > > Robert. > > > > > > On 9/3/07, Lambert Verhagen <[EMAIL PROTECTED]> wrote: > > > > Hi, > > > > > > > > I investigating the usage of openscenegraph for one of our application. > > > > I want to run this application using 1 thread for the update-cull-draw > > > > pipe. And another thread, that runs on the background with lower > > > > priority, that receives data from some external network and updates the > > > > graph. > > > > > > > > I can not exactly find a sample application using this multi threaded > > > > approach. But the function interface of databasepager suggests that this > > > > is supported. Can someone give me a clue? > > > > I also want to know the function collaboration between the view, > > > > updateVisitor, node and dataBasePager classes. > > > > > > > > Hope you can help me? > > > > Thanks in advance. > > > > Regards, > > > > Lambert > > > > > > > > > > > > Interested in MARIN's R&D 2007? Subscribe to the MARIN R&D seminar for > > > > the Dutch Industry on September 12. > > > > > > > > > > > > This e-mail and its content are subject to the disclaimer and General > > > > Conditions at www.marin.nl > > > > > > > > > > Interested in MARIN's R&D 2007? Subscribe to the MARIN R&D seminar for the > > Dutch Industry on September 12. > > > > > > Interested in MARIN's R&D 2007? Subscribe to the MARIN R&D seminar for the Dutch Industry on September 12. _______________________________________________ > > > > > > 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 > > _______________________________________________ > > 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 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
