[postgis-tickets] [PostGIS] #2818: ST_Extrude can't extrude all polygons

[PostGIS]

#2818: ST_Extrude can't extrude all polygons
--------------------+-------------------------------------------------------
 Reporter:  robe    |       Owner:  colivier     
     Type:  defect  |      Status:  new          
 Priority:  medium  |   Milestone:  PostGIS 2.2.0
Component:  sfcgal  |     Version:  trunk        
 Keywords:          |  
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 I'm not sure if this is perhaps something that has to be noted in the docs
 about setting directions of holes or perhaps ST_Extrude just doesn't work
 with polygons that have holes or I have to force it in a particular
 direction.

 I tried to extrude this polygon with holes which ST_IsValid says is valid


 {{{
 SELECT ST_Extrude('POLYGON(
 (-0.25 -1.25,-0.25 1.25,2.5 1.25,2.5 -1.25,-0.25 -1.25),
 (2.25 0,1.25 1,1.25 -1,2.25 0),(1 -1,1 1,0 0,1 -1))'::geometry, 0,0,1)
 }}}

 and got the message:


 {{{
 NOTICE:  During extrude(A, 0, 0, 1) :
 NOTICE:    with A: POLYGON((-1/4 -5/4,-1/4 5/4,5/2 5/4,5/2 -5/4,-1/4
 -5/4),(9/4 0/1,5/4 1/1,5/4 -1/1,9/4 0/1),(1/1 -1/1,1/1 1/1,0/1 0/1,1/1
 -1/1))


 ERROR:  Polygon is invalid : interior ring 0 is oriented in the same
 direction as exterior ring : POLYGON((-1/4 -5/4 0/1,5/2 -5/4 0/1,5/2 5/4
 0/1,-1/4 5/4 0/1,-1/4 -5/4 0/1),(9/4 0/1 0/1,5/4 1/1 0/1,5/4 -1/1 0/1,9/4
 0/1 0/1),(1/1 -1/1 0/1,1/1 1/1 0/1,0/1 0/1 0/1,
 ********** Error **********

 ERROR: Polygon is invalid : interior ring 0 is oriented in the same
 direction as exterior ring : POLYGON((-1/4 -5/4 0/1,5/2 -5/4 0/1,5/2 5/4
 0/1,-1/4 5/4 0/1,-1/4 -5/4 0/1),(9/4 0/1 0/1,5/4 1/1 0/1,5/4 -1/1 0/1,9/4
 0/1 0/1),(1/1 -1/1 0/1,1/1 1/1 0/1,0/1 0/1 0/1,

 }}}

 I also tried applying the sfcgal  ST_ForceLHR call to see if that would
 ameliorate the directional issue, but it did not.
 http://postgis.net/docs/manual-dev/ST_ForceLHR.html

 Then I tried the long available ST_ForceRHR and that also did not change
 the result. http://postgis.net/docs/manual-dev/ST_ForceRHR.html

-- 
Ticket URL: <http://trac.osgeo.org/postgis/ticket/2818>
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