[x3d-public] [x3dom-users] Setting Viewpoints - camera drifts off when moved with mouse

[Leonard Daly]

This is possibly not a bug. The behavior is specifically described in 
the X3D specification 
(http://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/components/navigation.html#X3DViewpointNode, 
sections e&f).

When changing viewpoints, the relative offset of position and 
orientation is retained and applied to the new viewpoint (some of the 
time). A lot appears to depend on how the new Viewpoint came to be the 
active one.

Reading through the specification, it does not seem to be particularly 
clear; even though I participated in the discussion that developed this 
language. I believe that this needs more clearly written. I have 
submitted a comment against the specification to improve this.


Leonard Daly




> Hi,
> I can reproduce this with both examples with this method:
>
> 1. Rotate object
> 2. Click as fast you can different viewpoints (continue some time)
>
> Soon viewpoints are behaving badly (front is not front etc.).
>
> Regards,
> Ari
>
> Chromium, Chrome,  Fifefox (Linux)
>
> Sent from my Debian.
> http://www.opendimension.org/
>
> 2015-12-02 14:22 GMT+02:00 Chris Ratcliffe <chris at theguild.tv 
> <mailto:chris at theguild.tv>>:
>
>     Annoyingly, it seems to be an intermittent problem.
>     I have tried in Chrome and Firefox and often get this problem.
>     This example from the X3dom blog seems to be a good example of the
>     "drift"
>
>     http://konfigurator.3dbetrieb.de/?b=x3d
>
>     If that looks fine to you, maybe It's some wierd local thing for me..
>
>     (CONTROLS: Perspektive=Perspective / Vorne=Front / Seite=Side /
>     Oben-Top)
>
>     theguild <http://www.theguild.tv>
>
>     Chris Ratcliffe / Animation / Graphics / Creative Code
>     44 (0) 7973 299 138/ chris at theguild.tv <mailto:chris at theguild.tv>
>
>     THE GUILD TV LTD / http://www.theguild.tv
>
>
>     On 2 December 2015 at 11:48, Roy Walmsley
>     <roy.walmsley at ntlworld.com <mailto:roy.walmsley at ntlworld.com>> wrote:
>
>         Hi Chris,
>
>         I checked your observations below, using the WaterFox browser
>         on a 64-bit Windows 10 system. I used your link below to open
>         the page and then chose the “Display example HTML file” from
>         the bottom  of the page.
>
>         I tried looking at all four views, selecting each one and
>         rotating the reindeer with the mouse, then going back and
>         reselecting and moving with the mouse, etc. Even after three
>         rounds of this I found that the viewpoint presets all still
>         worked fine.
>
>         What browser and system are you using? Can you define a
>         sequence more precisely that illustrates the anomalous behaviour?
>
>         Regards,
>
>         Roy
>
>         *From:*Chris Ratcliffe [mailto:chris at theguild.tv
>         <mailto:chris at theguild.tv>]
>         *Sent:* 02 December 2015 11:07
>         *To:* x3dom-users at lists.sourceforge.net
>         <mailto:x3dom-users at lists.sourceforge.net>
>         *Subject:* [x3dom-users] Setting Viewpoints - camera drifts
>         off when moved with mouse
>
>         Hi, wondering if anyone has a way to get this viewpoint
>         example to be more usable:
>
>         http://doc.x3dom.org/tutorials/animationInteraction/viewpoint/index.html
>
>         The problem with the online example is this:
>
>         If you rotate the reindeer with the mouse, the first time
>         everything is OK,
>
>         and you can use the viewpoint presets to pick the various views.
>
>         Rotate the reindeer with the mouse again and all the views are
>         offset.
>
>         (top view is no longer top etc..)
>
>
>
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-- 
*Leonard Daly*
X3D Co-Chair
Cloud Consultant
President, Daly Realism - /Creating the Future/
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