Hi, sherman wilcox wrote: > Since I didn't get any replies the first time around, I'd like to > offer a possible solution. > > What if the main visualization app sent queries (TCP/IP, IPC, etc.) to > another process which performed all the intersection tests. > Admittedly, this isn't high-performance, but performing these > intersection tests from another app most certainly wouldn't result in > dropped frames. For my particular problem I can suffer through the > lazy intersection tests. One question I have is whether or not I can > share the same paged database between two different apps. I don't think this level of sharing would be any problem at all, in the end both apps are just reading files from disk.
> > Thoughts...comments? It would be interesting to know how compact one can make the intersect app. Can one get away without an openGL context? Can one drop all cull/draw related updates? If you find answers to these I'm sure others will be interested. > > On 5/16/07, sherman wilcox <[EMAIL PROTECTED]> wrote: >> Hello everyone. I'm presently working on performing accurate runtime >> intersection tests of paged databases. I'm trying to perform these >> tests in a manner that doesn't result in dropped frames. >> >> My app uses an ellipsoid model of the earth that is paged. The terrain >> model itself is several GB in size and was built using osgdem. I have >> point data that I need to place just above the terrain @ runtime. I do >> not know ahead of time the latitude/longitude of the points. I can get >> as many as 20 a second at peak times. I wrote a small sample app using >> osgSim::LineOfSight to get the correct height. This works, but I'm >> told that running it on a background thread that isn't sync'ed with >> the scenegraph is not safe. Maybe you could try multiple database pagers? I have no idea if it would work though. >> If I run it from the main rendering loop, >> the intersection test can sometimes block for several seconds. Given >> the quantity of points that are coming in, the performance hit could >> make the app unusable. >> >> My question for the community is this: how do you guys perform >> accurate intersection tests against paged databases that don't result >> in frame loss? >> Don't know. jp -- This message is subject to the CSIR's copyright, terms and conditions and e-mail legal notice. Views expressed herein do not necessarily represent the views of the CSIR. CSIR E-mail Legal Notice http://mail.csir.co.za/CSIR_eMail_Legal_Notice.html CSIR Copyright, Terms and Conditions http://mail.csir.co.za/CSIR_Copyright.html For electronic copies of the CSIR Copyright, Terms and Conditions and the CSIR Legal Notice send a blank message with REQUEST LEGAL in the subject line to [EMAIL PROTECTED] This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. MailScanner thanks Transtec Computers for their support. _______________________________________________ osg-users mailing list osg-users@openscenegraph.net http://openscenegraph.net/mailman/listinfo/osg-users http://www.openscenegraph.org/
