[postgis-users] Different between Box2D and Box3D

[strk at refractions.net]

Box3d can store a Z value.
It is ignored by 2d operations (all of them, so far).
Box3d uses double precision floating point numbers.

Box2d can only store X and Y.
Box2d uses single precision floating point numbers.
Box2d is used to cache bounding box of geometries.

geometry::box2d <-- uses cache if any
geometry::box3d <-- computes the box for the geometry

--strk;

On Sun, Jun 19, 2005 at 03:47:33PM +0200, Johan de Koning wrote:
> Hello,
> 
> I was wondering what is the different between a Box2D and a Box3D 
> because in both situation the z-coordinate is ignored. Or am i wrong? 
> The manual doesn't give that much of information to see the difference.
> 
> Bye
> 
> Johan
> 
> 
> 
> 
> _______________________________________________
> postgis-users mailing list
> postgis-users at postgis.refractions.net
> http://postgis.refractions.net/mailman/listinfo/postgis-users