Raster background

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Micheal J. Williams (mwilliam++at++ldsa.com)
Mon, 6 Feb 95 10:17:18 EST

    I have a Performer 1.2 application for a flight simulator in which
we have 3D models flying over a polygonal terrain grid. Performer only
handles our models, the terrain is draw with GL in our draw callback.
We now need a 2D overview mode where we look down on the scene from
above, but for this mode we want to display a scanned map rather than
the terrain grid.

We are working on an Indigo2 Extreme and realize that software texture
mapping would be too slow. Does anyone know a way I can accomplish this?
Since all models will always be above the terrain, perhaps I could simply
throw a raster background up before the models. Is there a Performer, GL,
or X-windows way to do this. We are using IRIX 5.2.

I implemented this once by making my terrain grid size the same as the raster
post spacing, and using my existing GL code to draw the terrain colored
from the raster. This worked, but the frame rate is about 5 second, and
there is concern about this. Any help, or suggestions would be appreciated.

Mike Williams
mwilliam++at++ldsa.com

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