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<br>
Don, i made a tutorial about rotations and aiming the camera at a
certain point.<br>
It's at <a class="moz-txt-link-freetext" href="http://www.hersto.net/Tutorials/Rotations3D.php?lay=2">http://www.hersto.net/Tutorials/Rotations3D.php?lay=2</a><br>
Scroll down towards "<a>Orienting a Camera Towards an Object" and there
is script code<br>
for what you want to do. It's old-style VrmlScript, but should run as
SAI EcmaScript,<br>
too.<br>
<br>
BTW, would it be possible/desirable to link this tutorial and the
others i did from the tutorials<br>
page of the Web3D site </a><a>(http://www.web3d.org/x3d/learn/tutorial/
)</a><a>? <br>
<br>
<i>Herbert<br>
<br>
<br>
</i></a><br>
Don Brutzman wrote:
<blockquote cite="mid:4A42795F.7030104@nps.navy.mil" type="cite">newbie
question: want to compute an SFRotation orientation from
<br>
2 SFVec3f point locations using Java.
<br>
<br>
fyi this will be used in X3D-Edit as an authoring assist, to compute
<br>
the desired Viewpoint orientation (relative to -z axis default view)
<br>
that aims the Viewpoint from defined position towards a look-at point.
<br>
<br>
prefer to use X3D SAI for Java if possible. however i am not finding
any
<br>
utility functions in the spec:
<br>
<a class="moz-txt-link-freetext" href="http://www.web3d.org/x3d/specifications/ISO-IEC-19777-2-X3DLanguageBindings-Java/Part2/X3D_Java.html">http://www.web3d.org/x3d/specifications/ISO-IEC-19777-2-X3DLanguageBindings-Java/Part2/X3D_Java.html</a>
<br>
<br>
however the X3D SAI for ECMAScript does have such a utility method:
<br>
Table 7.18 — SFRotation instance creation functions
<br>
SFRotation (SFVec3f fromVector, SFVec3f toVector)
<br>
fromVector and toVector are normalized and the rotation value
<br>
that would rotate from the fromVector to the toVector is stored
<br>
in the object.
<br>
<a class="moz-txt-link-freetext" href="http://www.web3d.org/x3d/specifications/ISO-IEC-19777-1-X3DLanguageBindings-ECMAScript/Part1/functions.html#t-SFRotationInstanceCreationFunctions">http://www.web3d.org/x3d/specifications/ISO-IEC-19777-1-X3DLanguageBindings-ECMAScript/Part1/functions.html#t-SFRotationInstanceCreationFunctions</a>
<br>
<br>
thanks in advance for pointers or any example code, either using
<br>
Java SAI or simply some other exemplar Java source.
<br>
<br>
all the best, Don
<br>
</blockquote>
<br>
<br>
<div class="moz-signature">-- <br>
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<pre>_________________________________________________________
Bitmanagement Software GmbH
<a class="moz-txt-link-freetext" href="http://www.bitmanagement.de">http://www.bitmanagement.de</a>
Herbert Stocker
Dipl.-Ing. Univ.
Entwicklung/Engineering
Tel: +49 (0) 8151 971708
Fax: +49 (0) 8151 971709
E-Mail: <a class="moz-txt-link-abbreviated" href="mailto:herbert.stocker@bitmanagement.de">herbert.stocker@bitmanagement.de</a>
_________________________________________________________
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