[postgis-devel] ST_Envelope does it support 3d or not?

[Obe, Regina]

I was going thru all the functions trying to figure out which ones
support 3d and flagging them as I tested them.

The docs seem to suggest that ST_Envelope supports the z-coordinate
although it is somewhat vague.  
http://postgis.refractions.net/documentation/manual-svn/ST_Envelope.html

What exactly does

"(PostGIS will add a ZMIN/ZMAX coordinate as well)"

 mean - is that like future or it will if you have a geometry with a z
coordinate?

When I try this

SELECT ST_AsEWKT(ST_Envelope(ST_GeomFromEWKT('POLYGON((0 0 1, 0 1 2,
1.0000000001 1 3, 1.0000000001 0 4, 0 0 1))')));

I get something that doesn't look very 3d to me so I presume that
statement means future development?
POLYGON((0 0,0 1,1.00000011920929 1,1.00000011920929 0,0 0))

Thanks,
Regina
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