<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=utf-8"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Tom,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Yah that looks wrong and I get the same bad rendering too and right rendering with the Tesellate. Can you ticket this one and I'll take a look next chance I get.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><a href="http://postgis.net/support/">http://postgis.net/support/</a><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Thanks,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Regina<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='margin-left:.5in'><b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> postgis-devel [mailto:postgis-devel-bounces@lists.osgeo.org] <b>On Behalf Of </b>Tom van Tilburg<br><b>Sent:</b> Monday, January 18, 2016 11:25 AM<br><b>To:</b> PostGIS Development Discussion <postgis-devel@lists.osgeo.org><br><b>Subject:</b> [postgis-devel] Unexpected output from ST_AsX3D with PolyhedralSurfaceZ<o:p></o:p></span></p><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p><div><p class=MsoNormal style='margin-left:.5in'>Im trying to display some extruded buildings as X3D but noticed that the output with concave buildings (U shaped) creates a convex faceset on the top and bottom of the building. This doesn't seem right.<o:p></o:p></p><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>When I tesselate first, and therefore go fom polyhedralsurfacez to TIN the output is allright.<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>You can try with and without tesselate yourself:<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>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)))<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>For completeness:<o:p></o:p></p></div><div><div><p class=MsoNormal style='margin-left:.5in'><X3D><o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><Scene><o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'> <Viewpoint orientation='0.2 0 0 0.8' position='-10 -10 100'/> <o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'> <Background skyColor='1 1 1'/> <o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'> <Shape><o:p></o:p></p></div></div><div><p class=MsoNormal style='margin-left:.5in'><!--PUT YOUR OUTPUT HERE, TESSELATED VERSION ALREADY INCLUDES SHAPE --><o:p></o:p></p></div><div><div><p class=MsoNormal style='margin-left:.5in'></Shape><o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'> </Scene><o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'></X3D><o:p></o:p></p></div></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>Best, Tom<o:p></o:p></p></div></div></div></body></html>