Re: [Swarm-Support] Re:model

[Marcus G. Daniels]

yuefengch wrote:
> In my model I want to develop a 3 dimension continous space(don't 
> consider display).
A simple way is decide how continuous it really needs to be, and then 
make integers big enough to encode that. If you want resolution of 0.001 
units then multiply everything by 1000. Then make a C array like this:

id space[(MAX_X - MIN_X)* 1000][(MAX_Y - MIN_Y) * 1000][(MAX_Z - MIN_Z)* 
10000];


Then when you access `space' you'll need to do an add and multiply from 
each x/y/z value and also do some bound checking. A problem with this is 
that if you need much resolution or much range, you can run out of memory.

Another way to approach the problem, basically what Scott Christley 
said, is to encod coordinates in agents and use queries to relate where 
agents are relative to one another. Concretely, that could be done using 
a C interface to a database like http://postgis.refractions.net, which 
has 3d as well as 2d geometries.

Marcus