| 1 |
<?xml version="1.0" encoding="UTF-8"?>
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| 2 |
<!DOCTYPE X3D PUBLIC "ISO//Web3D//DTD X3D 4.0//EN" "https://www.web3d.org/specifications/x3d-4.0.dtd">
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| 3 | <X3D profile='Immersive' version='4.0' xmlns:xsd='http://www.w3.org/2001/XMLSchema-instance' xsd:noNamespaceSchemaLocation='https://www.web3d.org/specifications/x3d-4.0.xsd'> |
| 4 | <head> |
| 5 | <meta name='title' content=' ExtrusionEdgeCases.x3d '/> |
| 6 | <meta name='description' content='Scene incorporating extrusion edge cases'/> |
| 7 | <meta name='creator' content='Vsevolod Alekseyev, Vince Marchetti, Roy Walmsley, Leonard Daly, Dick Puk, Joe Williams, Don Brutzman'/> |
| 8 | <meta name='created' content='29 January 2016'/> |
| 9 | <meta name='modified' content='29 September 2025'/> |
| 10 | <meta name='reference' content='https://www.web3d.org/wiki/index.php/Extrusion_Edge_Cases'/> |
| 11 | <meta name=' TODO ' content=' add descriptions why each case holds special interest '/> |
| 12 | <meta name=' TODO ' content=' add named Viewpoints with name for each case '/> |
| 13 | <meta name=' TODO ' content=' X3D-public email thread http://web3d.org/pipermail/x3d-public_web3d.org/2016-January/004184.html '/> |
| 14 | <meta name=' TODO ' content=' Mantis issue 923 https://www.web3d.org/member-only/mantis/view.php?id=923 '/> |
| 15 | <meta name='specificationSection' content='X3D encodings, ISO/IEC 19775-1.4, Part 1: Architecture and base components, Clause 13 Geometry3D component, Topic 13.3.5 Extrusion, Section 13.3.5.4 Special cases'/> |
| 16 | <meta name='specificationUrl' content='https://www.web3d.org/specifications/X3Dv4/ISO-IEC19775-1v4-IS/Part01/components/geometry3D.html#Extrusion'/> |
| 17 | <meta name='identifier' content=' https://www.web3d.org/x3d/content/examples/Basic/X3dSpecifications/ExtrusionEdgeCases.x3d '/> |
| 18 | <meta name='generator' content='X3D-Edit 4.0, https://www.web3d.org/x3d/tools/X3D-Edit'/> |
| 19 | <meta name='license' content='../license.html'/> |
| 20 | </head> |
| 21 | <Scene> |
| 22 | <WorldInfo title='ExtrusionEdgeCases.x3d'/> |
| 23 | <Viewpoint description='ExtrusionEdgeCases.x3d' position='9 7 40'/> |
| 24 | <Group DEF='TriangularSquiggle'> |
| 25 | <Transform translation='2 10 0'> |
| 26 | <Shape> |
| 27 | <Appearance> |
| 28 | <Material diffuseColor='0.8 0.1 0.05'/> |
| 29 | </Appearance> |
| 30 | <Extrusion crossSection='-1 0 0 1 1 0 -1 0' scale='1 1 1 1 1 1 2 2 3 3 3 3' spine='-5 0 0 0 0 0 4 4 0 4 4 0 4 4 0 8 0 0'> |
| 31 | <!-- spine is open, crossSection is closed --> |
| 32 | </Extrusion> |
| 33 | </Shape> |
| 34 | </Transform> |
| 35 | </Group> |
| 36 | <Group> |
| 37 | <Transform scale='2 2 2' translation='-2 -2 0'> |
| 38 | <Shape> |
| 39 | <Appearance> |
| 40 | <Material diffuseColor='0 0.8 0.1'/> |
| 41 | </Appearance> |
| 42 | <Extrusion crossSection='-1 0 0 2 1 0 -1 0' solid='false'> |
| 43 | <!-- spine is open, crossSection is closed --> |
| 44 | </Extrusion> |
| 45 | </Shape> |
| 46 | </Transform> |
| 47 | </Group> |
| 48 | <Group> |
| 49 | <Transform scale='2 2 2' translation='2 -2 0'> |
| 50 | <Shape> |
| 51 | <Appearance> |
| 52 | <Material diffuseColor='0 0.8 0.1'/> |
| 53 | </Appearance> |
| 54 | <Extrusion crossSection='-1 0 0 2 1 0 -1 0' solid='false' spine='3 1 0 3 0 0'> |
| 55 | <!-- spine is open, crossSection is closed --> |
| 56 | </Extrusion> |
| 57 | </Shape> |
| 58 | </Transform> |
| 59 | </Group> |
| 60 | <Group> |
| 61 | <Transform scale='1.5 1.5 1.5' translation='20 0 0'> |
| 62 | <Shape> |
| 63 | <Appearance> |
| 64 | <Material diffuseColor='0.1 0 0.8'/> |
| 65 | </Appearance> |
| 66 | <!-- spine is closed with only 3 points, thus 2 independent points. Sounds like a potential problem but is actually legitimate (i.e. not geometrically degenerate) for many cases. --> |
| 67 | <Extrusion beginCap='false' endCap='false' scale='1 1 1.2 1.2 1.4 1.4' solid='false' spine='0 0 0 0 1 0 0 0 0'> |
| 68 | <!-- spine is closed, crossSection is closed --> |
| 69 | </Extrusion> |
| 70 | </Shape> |
| 71 | </Transform> |
| 72 | </Group> |
| 73 | </Scene> |
| 74 | </X3D> |
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