Hi Boon Wah, Loading shouldn't cause frame drops as the loading is done in back ground thread. Downloading the objects to graphics card is much more likely to cause frame drops, but for most VPB database on modern hardware this usually isn't an issue.
>From the sound of it you are setting the tile size to a very high value, you don't actually say whether you mean imagery or height field size, if it's imagery then it way too high, if your are referring to the height field then it's ridiculously high, and in both cases it's high enough to cause frame drops when downloading the data to GPU. Is there are reason why you aren't using VPB defaults for tile size? The defaults 256x256 for imagery, and 64x64 for the height field, and are chosen to provide a well balanced scene graph that loads and renders efficiently without framedrops. Robert. On Tue, Sep 6, 2011 at 3:54 AM, Boon Wah <boon...@gmail.com> wrote: > Hi Robert, > > I will like to clarify on my question. > > I may not know the correct technical terms, but probably you are right, I > am trying to minimize the frame drop rate. > > The scenario is like this: > > I have pre-compiled the data using VPB setting a tile size of 2048 by > 2048. The entire 'terrain' image is over 1GB and this produces about 400+ > tiles at the finest resolution. > > During rendering, I need to do a fly-pass at the finest resolution and > maintaining a frame-rate of 60fps. I realise that the loading time for each > tile is quite significant and this is causing a frame drop. A quick check is > that I did two identical fly-pass consecutively and found that once the data > has been loaded during the first fly-pass, there will not be frame drop for > the second fly-pass. > > This makes me think of trying to pre-load all the tiles into the pager > prior to commencing my fly-pass. What I wanted to know is how can I do this > easily? I am looking at the direction of building a customiser pager to > pre-load all the tiles (of course limited by my memory). > > > > > Kind Regards, > Boon Wah > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=42435#42435 > > > > > > _______________________________________________ > 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
