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Warp wrote:
>
> Andrea Ryan <ary### [at] global2000 net> wrote:
> : POV-Ray makes pictures by shooting rays from the camera into the scene
> : but how do scanline renderers create images?
>
> Put in a very simple way:
>
> Scanline renderers project the polygons on screen, ie. they take all the
> 3D vertices of the polygon, project them on screen, thus converting them to
> regular 2D polygons and then they draw that polygon as if it was just a
> 2D one.
> Of course if the polygon has texturing, it has to be done with perspective
> correction for it to be right.
>
> There are several methods for hidden surface removal. The best one of them
> is using a Z-buffer which makes a perfect removal and allows things like
> space cutting (ie. two polygons intersecting).
>
> You can easily imagine how fast this is.
> This is the technique used by 3D accelerator cards.
Finally!
Someone explained what scanline rendering is, instead of just saying:
"it's crap! raytracing is better".
--
Francois Labreque | Unfortunately, there's no such thing as a snooze
flabreq | button on a cat who wants breakfast.
@ | - Unattributed quote from rec.humor.funny
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