[MUD-Dev] coordinate systems

[Jon Leonard]

On Wed, May 31, 2000 at 05:00:58PM +1200, Richard Tew wrote:
> Scatter wrote:
> > Out of interest, do you model a flat world or a sphere? (And if the
> > latter, how do you map it to cartesian coordinates?)
> 
> I am just wondering, does anyone actually do this for their mud?
> If so, any pointers on the simplest way to go about it?

Not in a MUD (yet), but I have a small X program for wandering around on
a sphere, with the only visible stuff being lines of an icosahedron
inscribed in the sphere.

Basically I store position as 2 3-space vectors, one for position and
one for facing.  To move I add a vector to the current position, and
then renormalize the vectors (so they're still on the sphere).

If anyone is interested, I've just put a copy at:
http://www.slimy.com/~jleonard/src/sphereworld.html

I keep meaning to do a map system on arbitrary manifolds (world on a
moebius strip!), but I always seem to have better things to do.

> We do it flat at the moment, so if you keep sailing west, you would
> be going out into an infinite ocean.

I think that's probably easier.  You don't need floating point, and the
usual n,s,e,w directions don't have singulatities at the poles.

Jon Leonard



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