#2 Enhancement to alt to give colours and better orientation

[Ian Lister]

The attached patch improves the VRML output of
src/geo/alt/main.c by:

1) adding colour coding to the terrain based on height
(using the same colour scheme as the 2D output),
2) adding a light source above the terrain, and
3) plotting X/x/o markers on the model similar to the
2D output.

This makes the output a lot more useful and easier to
make sense of.

Ian

[Ian Lister]

Patch to add colour, lights and markers to alt

[Ian Lister]

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I also forgot:

4) putting the world origin in the middle of the terrain,
which makes navigation a whole heap more manageable in
browsers such as freewrl.

Ian