Butler, Lee Mr CIV USA USAMC wrote on Monday, June 01, 2009 1:55 PM:
> I'm looking for ways to efficiently store/display geometry with "flat"
> facets. That is to say, I want "all" creases (no interpolated
normals).
> I'm reading some hefty geometry (10-20M polys) for display (Currently
in
> OBJ format). There are only hundreds of unique normals. The OBJ
loader
> tristrips everything and computes per-vertex normals.
>
> Since I'm bumping up against the memory address limit on 32bit
machines
> when using this geometry, I'd *really* like to recoup the storage for
> all those (redundant) normals. I think using short ints for 'normal
> indexes' instead of per-vertex normals would buy me a fair bit of
space.
>
> Can anyone offer any pointers/guidance?
>
> Lee
Hi Lee,
I don't know anything about the OBJ loader except what 'osgconv --format
obj' tells me. Do the 'noTesselateLargePolygons' or 'noTriStripPolygons'
help?
$ osgconv --format obj
Plugin osgPlugins-2.9.5/osgdb_obj.dll
{
ReaderWriter : Wavefront OBJ Reader
{
features : readNode writeObject writeNode
extensions : .obj Alias Wavefront OBJ
format
options : AMBIENT=<unit> Set texture unit for
ambient texture
options : BUMP=<unit> Set texture unit for
bumpmap texture
options : DIFFUSE=<unit> Set texture unit for
diffuse texture
options : DISPLACEMENT=<unit> Set texture unit for
displacement texture
options : OPACITY=<unit> Set texture unit for
opacity/dissolve texture
options : REFLECTION=<unit> Set texture unit for
reflection texture
options : SPECULAR=<unit> Set texture unit for
specular texture
options : SPECULAR_EXPONENT=<unit> Set texture unit for
specular exponent texture
options : noRotation Do not do the default
rotate about X axis
options : noTesselateLargePolygons Do not do the default
tesselation of large polygons
options : noTriStripPolygons Do not do the default
tri stripping of polygons
}
}
HTH,
--
Bryan Thrall
FlightSafety International
bryan.thr...@flightsafety.com
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