Thank you Robert, that was exactly what I was looking for.
Looking at the source, I noticed that one can avoid using the
OSG_MAX_TEXTURE_SIZE environment variable by calling the method:
osg::Texture::Extensions::setMaxTextureSize(.)
in order to call it, I need for example a Texture2D object and then call its
getExtensions(.) method, I just not sure about what parameters I'm supposed
to pass, so I tried this:
osg::Texture2D::Extensions* extension = texture->getExtensions(*0, **true*);
if(extensions)
extension->setMaxTextureSize(64);
(having set to 'true' the second parameter, everything works fine...) but I
wonder: what value should be passed for the 1st parameter? 0, works, but it
was just a try...
Thank you again.
Alessandro
On Sat, Jan 10, 2009 at 5:06 PM, Robert Osfield <[email protected]>wrote:
> Hi Alessandro,
>
> You can set the OSG_MAX_TEXTURE_SIZE env var to the max size you want,
> this will force a rescale of all imagery larger than this when it's
> download to OpenGL. This is slow to keep doing at runtime though, the
> best thing would be to write a pre-processing traversal that rescales
> all the imagery to a sensible size then save out. Another thing you
> do is to use OpenGL texture compression to help reduce memory
> footprint down on the GPU and in main memory. Again converting your
> data once then use this processed model at runtime is the most
> efficient things to do. You can use osgconv to help out with this.
>
> Robert.
>
> On Sat, Jan 10, 2009 at 10:53 AM, alessandro terenzi
> <[email protected]> wrote:
> > Experiencing with models prepared by people that do not develop graphics
> for
> > realtime applications, it happens quite often that we have to deal with
> > models that come with not-power of 2 and/or very big textures.
> >
> > This took me to face with 2 problems:
> >
> > 1) if rescaling to power of 2 occurs, performances may be not as desired
> > 2) memory usage could be very high if many big textures are used
> >
> > I wonder if there is a way/hint to force OSG to rescale every texture to
> a
> > chosen max dimension?
> >
> > Thank you.
> > Alessandro
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> > [email protected]
> >
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> >
> >
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