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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='mso-fareast-language:EN-US'>Andreas,<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'>Thanks for your comments. Looking back at the standard again, that is ISO/IEC 19775-1 clause 13.3.6 IndexedFaceSet, notice what it says under list item e.1.:<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'>“</span>If the <i>colorIndex</i> field is not empty, colours are applied to each vertex of the IndexedFaceSet in exactly the same manner that the <i>coordIndex</i> field is used to choose coordinates for each vertex from the Coordinate node. The <i>colorIndex</i> field shall contain at least as many indices as the <i>coordIndex</i> field, and shall contain end-of-face markers (−1) in exactly the same places as the <i>coordIndex</i> field. If the greatest index in the <i>colorIndex</i> field is N, then there shall be N+1 colours in the <i>X3DColorNode</i> node.”<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>In this case the end-of-face markers in <i>colorIndex</i> are required to match the end-of-face markers in <i>coordIndex</i>. As we have already noted the <i>colorIndex</i> rules also apply to <i>normalIndex</i>. Therefore, all three can have, in the right circumstances, -1 values. This is reflected in the node signature for each of these three fields.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>All the best,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Roy<o:p></o:p></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><b><span lang=EN-US>From:</span></b><span lang=EN-US> Andreas Plesch [mailto:andreasplesch@gmail.com] <br><b>Sent:</b> 19 May 2017 14:35<br><b>To:</b> Roy Walmsley <roy.walmsley@ntlworld.com><br><b>Cc:</b> John Carlson <yottzumm@gmail.com>; X3D Graphics public mailing list <x3d-public@web3d.org>; x3dom mlist <x3dom-users@lists.sourceforge.net><br><b>Subject:</b> Re: [x3dom-users] [x3d-public] Ran across an interesting example.<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>Hi Roy,<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>sorry, I did not see your response in time.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I do think the signatures for colorIndex and normalIndex should be corrected to not include "or -1". Currently, they state:<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>MFInt32 [] colorIndex [] [0,∞) or -1<o:p></o:p></p></div><div><p class=MsoNormal>MFInt32 [] normalIndex [] [0,∞) or -1<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Perhaps these were just copied from coordIndex ? Or did VRML allow the -1 ?<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>On the other hand the signature for texCoordIndex is correct:<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>MFInt32 [] texCoordIndex [] [-1,∞)<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>-Andreas<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div></div><div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>On Fri, May 19, 2017 at 6:24 AM, Roy Walmsley <<a href="mailto:roy.walmsley@ntlworld.com" target="_blank">roy.walmsley@ntlworld.com</a>> wrote:<o:p></o:p></p><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm'><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>John,<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>This is an interesting example, because technically it is not legal X3D !!<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>That said, having saved it as a file, and tried it on the X3D Validator, it passed validation !!<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Your analysis is correct. Reviewing the standard explains why. Look at ISO/IEC 19775-1 clause 13.3.6 IndexedFaceSet (<a href="http://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/components/geometry3D.html#IndexedFaceSet" target="_blank">http://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/components/geometry3D.html#IndexedFaceSet</a>).<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>We’ll start with the eighth paragraph, which includes the words:<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>“If the <i>normal</i> field is not <code><span style='font-size:10.0pt'>NULL</span></code>, it shall contain a node derived from <i>X3DNormalNode</i> whose normals are applied to the vertices or faces of the IndexedFaceSet in a manner exactly equivalent to that described above for applying colours to vertices/faces (where <i>normalPerVertex</i> corresponds to <i>colorPerVertex</i> and <i>normalIndex</i> corresponds to <i>colorIndex</i>).”<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Now let’s look at what should happen for colorIndex when colorPerVertex is false. This is specified at list item d.1. two paragraphs earlier. It reads:<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>“If the <i>colorIndex</i> field is not empty, one colour is used for each face of the IndexedFaceSet. There shall be at least as many indices in the <i>colorIndex</i> field as there are faces in the IndexedFaceSet. If the greatest index in the <i>colorIndex</i> field is N, there shall be N+1 colours in the <i>X3DColorNode</i>. The <i>colorIndex</i> field shall not contain any negative entries.”<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Notice the last sentence, where it say there shall not be any negative values.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>So, applying these principles to the normals, we can see that there should be no negative values.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Perhaps the Schematron could be improved by adding a rule to check for this scenario. And thinking about it, it would probably be possible to do it in JSON, although it would be complicated.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>All the best,<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Roy<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span lang=EN-US>From:</span></b><span lang=EN-US> x3d-public [mailto:<a href="mailto:x3d-public-bounces@web3d.org" target="_blank">x3d-public-bounces@web3d.org</a>] <b>On Behalf Of </b>John Carlson<br><b>Sent:</b> 19 May 2017 10:57<br><b>To:</b> X3D Graphics public mailing list <<a href="mailto:x3d-public@web3d.org" target="_blank">x3d-public@web3d.org</a>>; <a href="mailto:x3dom-users@lists.sourceforge.net" target="_blank">x3dom-users@lists.sourceforge.net</a><br><b>Subject:</b> [x3d-public] Ran across an interesting example.</span><o:p></o:p></p></div></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>Below X3D XML NOT viewable in X3DOM, (Octaga??), Instant Player (console goes into infinite loop), H3D complains about: (Unnamed Normal.vector. Field has size 6). I think it may be because normalIndex has -1’s when normalPerVertex=false??? If I take out the -1’s, it’s viewable in X3DOM, Octaga, InstantPlayer, and H3D. The content still needs work, of course (It’s supposed to be a cube!).</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>X3DOM’s console looks like:</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>x3dom-full.js:4743 Uncaught TypeError: Cannot read property 'x' of undefined</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> at x3dom.registerNodeType.defineClass.nodeChanged.nodeChanged (x3dom-full.js:4743)</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> at x3dom.NodeNameSpace.setupTree (x3dom-full.js:2869)</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> at x3dom-full.js:2869</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> at Function.Array.forEach (x3dom-full.js:2)</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> at x3dom.NodeNameSpace.setupTree (x3dom-full.js:2869)</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> at x3dom-full.js:2869</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> at Function.Array.forEach (x3dom-full.js:2)</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> at x3dom.NodeNameSpace.setupTree (x3dom-full.js:2869)</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> at x3dom-full.js:2869</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> at Function.Array.forEach (x3dom-full.js:2)</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>What does quality assurance report? I don’t get any significant warnings from X3D-Edit or X3DJSAIL, that I can tell!</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>Not sure about the standard, but leaving out the -1’s makes sense if normalPerVertex = false, I think. I’ll let others weigh in about the standard.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>Thanks,</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>John</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US><?xml version="1.0" encoding="UTF-8"?></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US><!DOCTYPE X3D PUBLIC "ISO//Web3D//DTD X3D 3.3//EN" "<a href="http://www.web3d.org/specifications/x3d-3.3.dtd" target="_blank">http://www.web3d.org/specifications/x3d-3.3.dtd</a>"></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US><X3D profile='Interchange' version='3.3' xmlns:xsd='<a href="http://www.w3.org/2001/XMLSchema-instance" target="_blank">http://www.w3.org/2001/XMLSchema-instance</a>' xsd:noNamespaceSchemaLocation='<a href="http://www.web3d.org/specifications/x3d-3.3.xsd" target="_blank">http://www.web3d.org/specifications/x3d-3.3.xsd</a>'></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <head></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <meta name='title' content='template.json'/></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <meta name='identifier' content='<a href="http://coderextreme.net/X3DJSONLD/template.json'/" target="_blank">http://coderextreme.net/X3DJSONLD/template.json'/</a>></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <meta name='description' content='Template for an Indexed Face Set'/></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <meta name='creator' content='John Carlson'/></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <meta name='created' content='4 April 2017'/></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> </head></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <Scene></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <Group></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <Shape></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <IndexedFaceSet DEF='IndexedFaceSet' colorIndex='0 0 0 -1 0 0 0 -1 0 0 0 0 -1 0 0 0 0 -1 0 0 0 0 -1 0 0 0 0 -1 0 0 0 0 -1' coordIndex='0 0 1 -1 0 1 1 -1 2 2 3 3 -1 0 3 3 0 -1 0 3 2 1 -1 1 2 2 1 -1 1 2 3 0 -1' creaseAngle='1.57' normalIndex='0 -1 0 -1 1 -1 2 -1 3 -1 4 -1 5 -1' normalPerVertex='false'></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <Color color='0 1 0'/></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <Coordinate point='0 0 1 0 1 1 1 1 1 1 0 1'/></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> <Normal vector='1 0 0 -1 0 0 0 1 0 0 0 -1 0 -1 0 0 0 1'/></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> </IndexedFaceSet></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> </Shape></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> </Group></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> </Scene></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US></X3D></span><o:p></o:p></p></div></div><p class=MsoNormal style='margin-bottom:12.0pt'><br>------------------------------------------------------------------------------<br>Check out the vibrant tech community on one of the world's most<br>engaging tech sites, Slashdot.org! <a href="http://sdm.link/slashdot" target="_blank">http://sdm.link/slashdot</a><br>_______________________________________________<br>X3dom-users mailing list<br><a href="mailto:X3dom-users@lists.sourceforge.net">X3dom-users@lists.sourceforge.net</a><br><a href="https://lists.sourceforge.net/lists/listinfo/x3dom-users" target="_blank">https://lists.sourceforge.net/lists/listinfo/x3dom-users</a><o:p></o:p></p></blockquote></div><p class=MsoNormal><br><br clear=all><o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal>-- <o:p></o:p></p><div><p class=MsoNormal>Andreas Plesch<br>39 Barbara Rd.<br>Waltham, MA 02453<o:p></o:p></p></div></div></div></body></html>