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--></style></head><body lang=EN-US link=blue vlink="#954F72"><div class=WordSection1><ul style='margin-top:0in' type=disc><li class=MsoListParagraph style='margin-left:0in;mso-list:l0 level1 lfo1'>So I would guess for ecmascript it should<o:p></o:p></li></ul><p class=MsoNormal>be rot.y = 1.0</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>me too because rot values can be set as rot.x rot.y rot.z and rot.a </p><p class=MsoNormal>and axis can be set by by axis.x axis.y and axis.z</p><p class=MsoNormal>so in this example the last one set is the final value. </p><p class=MsoNormal>Joe</p><p class=MsoNormal><o:p> </o:p></p><div style='mso-element:para-border-div;border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='border:none;padding:0in'><b>From: </b><a href="mailto:andreasplesch@gmail.com">Andreas Plesch</a><br><b>Sent: </b>Tuesday, March 3, 2020 7:08 AM<br><b>To: </b><a href="mailto:x3d-public@web3d.org">X3D Graphics public mailing list</a><br><b>Subject: </b>[x3d-public] SFRotation constructor axis argument by reference orvalue ?</p></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>In the ecmascript SAI, SFRotation has a constructor which has the</p><p class=MsoNormal>rotation axis as a SFVec3f argument:</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>new SFRotation ( SFVec3f axis, numeric angle )</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>https://www.web3d.org/documents/specifications/19777-1/V3.3/Part1/functions.html#SFRotation</p><p class=MsoNormal>(Table 7.18, -url in the first sentence is off-)</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The question is when I make a new SFRotation and later change the</p><p class=MsoNormal>SFVec3f which was used for the axis, does the previously constructed</p><p class=MsoNormal>SFRotation also change ?</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>axis = new SFVec3f ( 0, 0, 1 );</p><p class=MsoNormal>rot = new SFRotation( axis, 3.14 );</p><p class=MsoNormal>axis.y = 1.0</p><p class=MsoNormal>axis.z = 0.0</p><p class=MsoNormal>// rot.y is ?</p><p class=MsoNormal>// constructed by value: rot.y = 0.0</p><p class=MsoNormal>// constructed by reference: rot.y = 1.0</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I did not check the abstract SAI spec. for guidance so it is very</p><p class=MsoNormal>possible I missed something.</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>This is just an example. There are of course other constructors which</p><p class=MsoNormal>use objects as parameters. It is also probably rare that a script</p><p class=MsoNormal>would want to do this.</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>It may depend on the scripting language. In ecmascript objects are</p><p class=MsoNormal>passed by reference, you have to explicitly make a copy if you need</p><p class=MsoNormal>it. This is for performance. So I would guess for ecmascript it should</p><p class=MsoNormal>be rot.y = 1.0 .</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>-Andreas</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>-- </p><p class=MsoNormal>Andreas Plesch</p><p class=MsoNormal>Waltham, MA 02453</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>_______________________________________________</p><p class=MsoNormal>x3d-public mailing list</p><p class=MsoNormal>x3d-public@web3d.org</p><p class=MsoNormal>http://web3d.org/mailman/listinfo/x3d-public_web3d.org</p><p class=MsoNormal><o:p> </o:p></p></div></body></html>