[postgis-tickets] [PostGIS] #3435: Unexpected output from ST_AsX3D with PolyhedralSurfaceZ

[PostGIS]

#3435: Unexpected output from ST_AsX3D with PolyhedralSurfaceZ
----------------------------+---------------------------
  Reporter:  tomvantilburg  |      Owner:  robe
      Type:  defect         |     Status:  new
  Priority:  medium         |  Milestone:  PostGIS 2.2.2
 Component:  postgis        |    Version:  2.2.x
Resolution:                 |   Keywords:
----------------------------+---------------------------

Comment (by robe):

 tomvantilburg,

 The problem seems to be that I need to specify if the polygon is convex or
 not.  Seems the spec assumes convex.

 I redid mine using:


 {{{
 SELECT '<Shape><appearance>
   <material ambientintensity="0.500" containerfield="material"
 shininess="1" diffusecolor="0.8 0.3 0.4" /> </appearance>' ||
 replace(ST_AsX3D(ST_Extrude(ST_GeometryFromText('Polygon((0 0, 0 10, 30
 10, 30 0, 20 0, 20 5, 10 5, 10 0, 0 0))'),0,0,10)), 'IndexedFaceSet',
 'IndexedFaceSet convex="false"') || '</Shape>'
 }}}

 so basically adding a convex="false" with


 {{{
 <IndexedFaceSet convex='false'  coordIndex='0 1 2 3 4 5 6 7 -1 8 9 10 11
 12 13 14 15 -1 16 17 18 19 -1 20 21 22 23 -1 24 25 26 27 -1 28 29 30 31 -1
 32 33 34 35 -1 36 37 38 39 -1 40 41 42 43 -1 44 45 46 47'><Coordinate
 point='0 0 0 0 10 0 30 10 0 30 0 0 20 0 0 20 5 0 10 5 0 10 0 0 0 0 10 10 0
 10 10 5 10 20 5 10 20 0 10 30 0 10 30 10 10 0 10 10 0 0 0 0 0 10 0 10 10 0
 10 0 0 10 0 0 10 10 30 10 10 30 10 0 30 10 0 30 10 10 30 0 10 30 0 0 30 0
 0 30 0 10 20 0 10 20 0 0 20 0 0 20 0 10 20 5 10 20 5 0 20 5 0 20 5 10 10 5
 10 10 5 0 10 5 0 10 5 10 10 0 10 10 0 0 10 0 0 10 0 10 0 0 10 0 0 0'
 /></IndexedFaceSet>
 }}}

 and output then looks correct:

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/3435#comment:3>
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