Hi J-S, You need to decide what you want to do, but personally I'd recommend using --terrain and then in your app decide how much detail you want, you can make this user definable, provide reasonable defaults for different classes of hardware 0 they key is it's under your control and even after the app is deployed you can still tweak things to better fit the hardware.
--terrain also provide much greater opportunities for compressing the tiles on disk. More work will go into this in the future, so tiles with --terrain will end up being more compact despite have more geometry detail available when you need it. Robert. On Mon, Sep 29, 2008 at 4:20 PM, Jean-Sébastien Guay <[EMAIL PROTECTED]> wrote: > Hi Robert, > >> The main speed up with using --terrain in the osgdem/vpbmaster build >> is that the tile geometry doesn't need to simplified - it can just be >> aquired from the source DEM's as grids and then output as grids. > > [...] > >> The key thing to remember with --terrain databases is that since the >> triangulation is done dynamically on load you do load balancing - you >> can set the Terrain::setSampleRatio() according to the hardware that >> you have > > Ok, so in order to get --terrain databases to work optimally on all machines > I would have to expose this setting in my software's config files (for > example) so that it can be tweaked according to each machine's hardware, is > that right? > > I would suspect that on relatively flat terrain, the terrain database using > simplified geometry might run fast enough on all machines (or all reasonably > fast machines) without losing any relevant detail, whereas the --terrain > database would be too slow on older machines, which would require that we > lower the sampleRatio, and thus lose some detail? Is that possible? > > In that case, if we need to support a large number of different hardware > configurations, we might be willing to accept the longer build times of not > using --terrain in exchange for not needing to tweak sampleRatio and not > losing any detail. > > Thanks, > > J-S > -- > ______________________________________________________ > Jean-Sebastien Guay [EMAIL PROTECTED] > http://www.cm-labs.com/ > http://whitestar02.webhop.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
