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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='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Andreas,<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'>Having reviewed the specification I agree with you. I think the centerOfRotation should in the local coordinate system, just like the position. It is worth generating a formal <a href="http://www.web3d.org/content/web3d-standards-comment-form">specification comment</a> to clarify the spec. As you spotted this, would you like to raise the comment?<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'>Roy<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><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> x3d-public [mailto:x3d-public-bounces@web3d.org] <b>On Behalf Of </b>Andreas Plesch<br><b>Sent:</b> 10 June 2015 14:04<br><b>To:</b> X3D Graphics public mailing list<br><b>Subject:</b> [x3d-public] viewpoint center of rotation coordinate system<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>In the spirit of the detailed review of the spec., a clarification of the coordinate system of the center of rotation position given with a viewpoint node may be appropriate.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Since the position of viewpoint is given in the local coordinate system, I would have expected that the center of rotation is also given in the local coordinate system. However, the spec. at<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal><a href="http://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/components/navigation.html#X3DViewpointNode">http://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/components/navigation.html#X3DViewpointNode</a><o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>does not spell out the coordinate system for the center of rotation position, and x3dom currently uses the world coordinate system for the center of rotation, see issue <a href="https://github.com/x3dom/x3dom/issues/504">https://github.com/x3dom/x3dom/issues/504</a>. although this may be an oversight.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>If the intention is to use the local coordinate system for the center of rotation position, it may be useful to spell it out in the spec. as well.<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><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></div></body></html>