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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi Tony,<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks for your very quick response.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I would like to add that I think my interpretation
is more than reasonable, because it makes good economic sense.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Any interpretation other than what Xj3D
and Contact uses forces the developer to add a <span class=SpellE>ProximitySensor</span>
into the<o:p></o:p></span></font></p>

<p class=MsoNormal><span class=GramE><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>scene</span></font></span><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'> to turn off the animation -resulting in a duplication of effort because
the LOD already tracks the user.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The LOD/<span class=SpellE>VisibilitySensor</span>
tandem combo is elegant.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks again,<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Russ Kinter<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

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<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>

<hr size=2 width="100%" align=center tabindex=-1>

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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Tony Parisi
[mailto:<st1:PersonName w:st="on">tparisi@vivaty.com</st1:PersonName>] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, September 22, 2009
4:12 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Russ Kinter;
x3d-public@web3d.org; vrml<br>
<b><span style='font-weight:bold'>Cc:</span></b> FreeWRL X3D/VRML Viewer<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [WWW-Vrml]
VisibilitySensor in LOD Level Browser Tests</span></font><o:p></o:p></p>

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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Hi Russ<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>I believe this.
Vivaty Player doesn&#8217;t cull out sensors if their boxes aren&#8217;t part
of the active scene graph. It&#8217;s never been clear to me&#8212;nor explicit
in the spec&#8212;as to what the correct behavior is supposed to be for a
sensor that is switched out of a Switch or LOD. It would be nice to get some
clarifying language in the spec someday.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>But your
interpretation is totally reasonable. Sorry if we came down on the wrong side
of it :-o I promise you it was motivated purely by the desire to keep an already
complicated implementation as simple as we could. But I could certainly be
talked into changing this in the future.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Tony<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p>&nbsp;</o:p></span></font></p>

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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
www-vrml-bounces@web3d.org [mailto:www-vrml-bounces@web3d.org] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Russ Kinter<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, September 22, 2009
1:05 PM<br>
<b><span style='font-weight:bold'>To:</span></b> x3d-public@web3d.org; 'vrml'<br>
<b><span style='font-weight:bold'>Cc:</span></b> <st1:PersonName w:st="on">'FreeWRL
 X3D/VRML Viewer'</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> [WWW-Vrml]
VisibilitySensor in LOD Level Browser Tests<o:p></o:p></span></font></p>

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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi,<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I have been doing some testing of including a
VisibilitySensor as a member of the first level of the LOD Node to control an
animation. The idea is that the animation won&#8217;t start until the animated
geometry appears in the range of the LOD.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The VisibilitySensor is grouped with this geometry.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The results work similar to a ProximitySensor. <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>This method should work according to &#8220;The Annotated
VRML 97 Reference Manual&#8221; at <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><a
href="http://www.cs.vu.nl/~eliens/documents/vrml/reference/CH3.HTM#VisibilitySensor">http://www.cs.vu.nl/~eliens/documents/vrml/reference/CH3.HTM#VisibilitySensor</a>
:<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&#8220;If <i><span style='font-style:italic'>enabled</span></i>
is TRUE, the VisibilitySensor node detects changes to the visibility status of
the box specified and sends events through the <i><span style='font-style:italic'>isActive</span></i>
eventOut. A TRUE event is output to <i><span style='font-style:italic'>isActive</span></i>
when any portion of the box impacts the rendered view. A FALSE event is sent
when the box has no effect on the view. Browsers shall guarantee that, if <i><span
style='font-style:italic'>isActive</span></i> is FALSE, the box has absolutely
no effect on the rendered view. Browsers may err liberally when <i><span
style='font-style:italic'>isActive</span></i> is TRUE. For example, the box may
affect the rendering.&#8221;<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>If the VisibilitySensor as a member of a LOD level is
currently out of range that means its box is NOT impacting the rendered view,
so its isActive output should be FALSE.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>This test world: <a
href="http://www.sevenemeraldtablets.net/VisibilityTest/VisibilityTest2.wrl">http://www.sevenemeraldtablets.net/VisibilityTest/VisibilityTest2.wrl</a>
<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>however shows mixed results for various browsers.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>There is a HUD display of the VisibilitySensor and
TimeSensor activity. <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The transparent red cube is both the
VisibilitySensor&#8217;s box and LOD range boundary. <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Xj3D and Contact get it right! kudos!.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Vivaty does initially, but if the user enters box/LOD level
and turns on the animation and then leaves the range<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Vivaty won&#8217;t switch off the animation, so the LOD is
ignored after the VisibilitySensor is activated. <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The VisibilitySensor seems to work as it should otherwise. <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>InstantPlayer fails in that it will not shut off the
VisibilitySensor when it is out of the LOD range.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The LOD has no affect on it and is ignored. The
VisibilitySensor works as it should otherwise.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>CosmoPlayer does the opposite of Vivaty. It makes the
VisibilitySensor active on load, but once the viewer enters the range<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>and leaves, then the test works just like it should.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>FreeWRL works initially, but once the LOD range is entered
and the VisibiltySensor is activated, then the VisibiltySensor<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>isActive TRUE no matter what &#8211;even when the red box is
out of sight and out of mind.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Clicking on the cones to change viewpoints FreeWRL puts the
user at the wrong coordinates. <o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Cortona 5.1 fails completely. The VisibilitySensor isActive
TRUE no matter what -even if the user is completely turned away.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>OctagaPlayer fails too in exactly the same way.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks!</span></font><o:p></o:p></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Russ Kinter</span></font><o:p></o:p></p>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>&quot;All the fires of Cain's motivation cannot burn a love
that's sound.&quot; - Stacy Sutherland</span></font><o:p></o:p></p>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

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