RE: [Plib-devel] Rendering really, really large displays

[Vallevand, M. K <Mar...@UN...>]

I played with this a while ago trying to go exactly that - hires
screen snaps.  I had mixed results, and gave up.

In theory, it should work.

Regards.
Mark K Vallevand   ma...@rs...
Never try and teach a pig to sing: it's a waste of time, and it annoys
the pig.


> -----Original Message-----
> From: Curtis L. Olson [mailto:cu...@me...]
> Sent: Wednesday, August 16, 2000 3:30 PM
> To: pli...@li...
> Subject: [Plib-devel] Rendering really, really large displays
> 
> 
> I just ran across Brian Paul's little utility library that renders a
> series of tiles to achieve potentially huge pixel resolution displays.
> This is good for screen snapshots, not real time rendering ...
> 
>     http://www.mesa3d.org/brianp/TR.html
> 
> This library requires a call to trFrustum() which is analogous to
> glFrustum().
> 
> Ok, so now is as good a time as any to admit that after many years of
> ssg use, Steve's master plan is now complete -- my mind is complete
> mush.  I've forgotten the intricacies of setting the modelview matrix
> vs. the project matrix and all that fun stuff.  I've even forgotten if
> I ever really understood them in the first place.
> 
> So the question is, has anyone played around with using this library
> in an ssg application?  If I wanted to forge ahead, could I just do
> something like the following:
> 
>     ssgContext *mycontext = ssgGetCurrentContext();
>     sgFrustum *myfrustum = mycontext->getFrustum();
> 
>     /* A */
> 
>     trFrustum( myfrustum->getLeft(), myfrustum->getRight(),
>                myfrustum->getTop(), myfrustum->getBot(),
>                myfrustum->getNear(), myfrustum->getFar() );
> 
>     // proceed with the "TR" lib code to render out all the subtiles
> 
> Does this sound reasonable or do I need to do additional magic at
> point /* A */ in the above code to get the projection matrix setup
> correctly?
> 
> In the ssg.h file, ssgGetCurrentContext() is in a "backwards
> compatibility" section.  Is there a better way now to get the current
> Frustum matrix?
> 
> Any thoughts before I go off to waste 2 weeks of my time trying to
> figure all of this out?
> 
> Thanks,
> 
> Curt.
> -- 
> Curtis Olson   Human Factors Research Lab       Flight Gear Project
> Twin Cities    cu...@hf...                cu...@fl...
> Minnesota      http://www.menet.umn.edu/~curt   
> http://www.flightgear.org
> 
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