drawing only what changes

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john econopouly (john++at++video1.bloomberg.com)
Wed, 26 Feb 1997 18:34:34 -0500

I need to save some time in my drawing routine, and fewer polygons
is not an option. I would like to draw only the parts of the image
that change from frame to frame. What is the best way to do this?

Imagine for example that only a long thin diagonal portion of my window
(one fourth of the total pixels) will be changing. I would like to
avoid redrawing all the other pixels on every frame. Is there any
more efficient way to achieve this other than clearing the depth-buffer
to a "near" value and then drawing a diagonal of "far" values into it
on every frame (using GL calls)?

thanks
j
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