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

[PostGIS]

#3435: Unexpected output from ST_AsX3D with PolyhedralSurfaceZ
---------------------------+---------------------------
 Reporter:  tomvantilburg  |      Owner:  pramsey
     Type:  defect         |     Status:  new
 Priority:  medium         |  Milestone:  PostGIS 2.2.2
Component:  postgis        |    Version:  2.2.x
 Keywords:                 |
---------------------------+---------------------------
 When extruding polygons as X3D the output with concave polygons (U shaped)
 will create a convex faceset on the top and bottom of the 3D structure
 whereas a concave faceset is expected.

 When tesselated first, and therefore fom polyhedralsurfacez to TIN the
 output is allright.

 Test with:

 {{{
 SELECT ST_AsX3D(ST_Tesselate(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)))
 }}}


 For completeness:

 {{{
 <X3D>
 <Scene>
         <Viewpoint orientation='0.2 0 0 0.8' position='-10 -10 100'/>
         <Background skyColor='1 1 1'/>
         <Shape>
 <!--PUT YOUR OUTPUT HERE, TESSELATED VERSION ALREADY INCLUDES SHAPE -->
 </Shape>
     </Scene>
 </X3D>
 }}}

--
Ticket URL: <https://trac.osgeo.org/postgis/ticket/3435>
PostGIS <http://trac.osgeo.org/postgis/>
The PostGIS Trac is used for bug, enhancement & task tracking, a user and developer wiki, and a view into the subversion code repository of PostGIS project.