On Wed, Feb 27, 2008 at 6:48 AM, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > First, thank you to everyone for their work putting OSG > and VPB, this is really an amazing piece of software. > > Q1: Is there any advantage to having a single large osga > model built from say a 16kx16k input or having lots of > smaller 4kx4k tiled sections in separate files?
Performance is little different. > Q2: Will rebuilding the database with more levels help > smooth out lag spikes when the various LOD nodes come into > view ? Do you mean more levels and small individual tiles? What exactly do you mean by a lag spikes? A frame rate drop, or just that it takes a long time to load the data? How are you storing the paged database? Locally on the machine, over the web?? > Q2: What are the parameters can I tweak in an OSG > application to tweak how the program runs? Well there are hundreds of classes with dozens of methods in each... so a massive set of options you can tweak. First thing is to figure out what the actual performance problem is then to guide in the right direction. > Q3: Can I force the OSG application not to swap out the > database and just recalculate the mesh ? I don't understand what you mean. > Background: I have a 16kx16 texture and 4kx4k height map > that I have used VPB to build a model of following the walk > through on the wiki. While using some simple dynamics to fly > over the terrain, my frame rates will nose dive at certain > points when database need to be paged in. The terrain takes > up about 500 meg on disk and I think might all fight in > memory. The database should run at a solid 60Hz on most modern PC's, you shouldn't see big nose dives in frame rate. The database you have is pretty small, even with scaling up to terrabytes of data you still get a solid 60Hz without memory problems. What OS are you working on? What hardware? Have you built the OSG in release mode? Robert. _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
