Hi Paul, On Tue, Apr 7, 2009 at 3:58 PM, Paul Martz <pma...@skew-matrix.com> wrote:
> Interesting... Neither osgdem nor vpbmaster show a "--pot" command line > option in their help output, but neither of them complain if "--pot" is > present on their command lines. The cache file output from osgdem doesn't > appear to be different with or without "--pot", which makes me think this > must be a vpbmaster option. > The non power of two support is pretty new. I've just checked the build options and it's set to round to a power of two by default - which is how it originally worked. This is for controlling whether the output imagery is clamped to a power of two, Using -npot enables the use of non power of two output imagery. > Just to be safe, I put "--pot" on both the osgdem and vpbmaster command > lines, and I still get the same results. So this isn't the cause of the > issue. Any other suggestions? > Given that --pot is default then it's unlikely to make a difference, and suggest that this isn't the issue at hand. > Robert, I'm not specifying the "--compressed" option when I build the DB, > so I don't think I need support for compressed NPOT textures. (I'm assuming > compression is off by default, as there doesn't appear to be a > "--no-compression" option.) > compression is on by default as the results in the best paging performance. Trying using --RGB to select convetional rgb output. > JS -- This is a MacPro with GeForce 8800. It supports > GL_ARB_non_power_of_two. > > Nonetheless, there is something about the MacPro/GF8800 that is causing the > issue at build time: When I view the DB built on the Mac on either my > Windows or Mac system, the issue is present. When I build the same DB using > the same source data on Windows, the issue is not present. > This may well be down to a driver bug. I vaguely remember issues about read back of texture objects being faulty under OSX so perhaps this is the the problem. > (Ideally I'd like to use my Mac; building VPB DBs is one of the main > reasons I bought this system. It builds the DB some 20x faster than my old > clunker Windows system.) > Not using Windows for thread and file system intensive work is sensible for sure. But... NVidia drivers under OSX are a bit flaky, it seems that NVidia OSX drivers have about the same quality as ATI drivers under Windows + Linux. Try dual booting the machine to linux, at least then you'll know you can select a decent filesystem and graphics drivers. Robert.
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