[postgis-devel] Why is ST_Buffer returning Z -- more smurf code

[Obe, Regina]

Am I dreaming?  I was scanning the results of my torture test and
noticed this

	SELECT 'ST_MinimumBoundingCircle PolygonSet3D: Start Testing
POLYGON'; 
	BEGIN; 
	SELECT ST_AsEWKT(ST_MinimumBoundingCircle(foo1.the_geom,3))
			  
			FROM ((SELECT
ST_SetSRID(ST_MakePolygon(ST_AddPoint(ST_AddPoint(ST_MakeLine(ST_MakePoi
nt(i+m,j,m),ST_MakePoint(j+m,i-m,m)),ST_MakePoint(i,j,m)),ST_MakePointM(
i+m,j,m))),4326)  As the_geom 
		FROM generate_series(-10,50,20) As i 
			CROSS JOIN generate_series(50,70, 20) As j
			CROSS JOIN generate_series(1,2) As m)) As foo1;

	COMMIT;
	SELECT 'ST_MinimumBoundingCircle PolygonSet3D: End Testing
POLYGON';

The first record returns this
"SRID=4326;POLYGON((63.6335136523794 19.5 1,57.8547185774435
-2.06675682618968 1.7e-308,42.0667568261897 -17.8547185774434
1.7e-308,20.5000000000001 -23.6335136523794 1.7e-308,-1.06675682618963
-17.8547185774435 1.7e-308,-16.8547185774434 -2.0667568261898
1.7e-308,-22.6335136523794 19.4999999999999 1.7e-308,-16.8547185774435
41.0667568261896 1.7e-308,-1.06675682618985 56.8547185774434
1.7e-308,20.4999999999998 62.6335136523794 1.7e-308,42.0667568261895
56.8547185774436 1.7e-308,57.8547185774433 41.0667568261899
1.7e-308,63.6335136523794 19.5 1))"

Am I dreaming or do I see a Z index there.
MinimumBoundingCircle as its last call -- buffers the point it
determined to be the centroid.

Then I looked at the results of ST_Buffer and yes indeed when buffering
a 3d point it does
return 2.5 d circle or whatever.  Is this useful?
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