"Zeger Knaepen" wrote:
> it does say "Movies made with POVRAY" on the top of the page, so that would
> also be my guess :)

I somehow missed that...

"clipka" <nomail@nomail> wrote:
>
> Actually, the description on that page says it all:
>
> - the X/Z position and overall heading of the tank was probably fixed beforehand
>
> - for every frame, the trace() function was probably used to get samples of the
> terrain's height where the tank should be (maybe one per each of the tank's
> running wheels?)
>
> - the tank's orientation would be tweaked accordingly, and maybe the running
> wheels' position and running track geometry as well
>
> - the tracks left behind would then be generated by difference-ing the height
> field with some boxes placed according to the trace() results.
>
> - for efficiency, the trace() results to generate the track-making boxes from
> might have been written to a file and retrieved during the next frame

I forgot about the trace() command.  It's now obvious to me now.  Thanks for
your explanation clipka.

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