[x3d-public] Earth Navigation [was: x3d-public Digest, Vol 81, Issue 8]

Fri Dec 4 08:45:57 PST 2015

Clement,

I have a simple example at 
http://tools.realism.com/x3d-examples/EarthNavigation/index.html. This 
does everything except the 2D rotation. I put this together in about 1 
hour using existing stock X3D/X3DOM capabilities.

To reproduce the 2D rotation, the control+buttons event would need to be 
captured prior to the existing Navigation and the proper orientation 
algorithm applied. I don't have the time to work on this right now. I 
would start with seeing if jQuery could capture a button down event on 
the <scene> tag (id='x3dScene' in this example) prior to Navigation 
getting it. The it becomes a simple matter of applying the correct 
algorithm based on the starting position and the current cursor position 
in the X3D window.

At this time I am having a hard time trying to figure out the conditions 
when you would want to use the feature to change the ground-plane 
orientation. If you could describe a situation when this would be useful 
(or needed), I may be able to develop an alternative.

If you want to just be able to "straighten-up" the Earth so that North 
is vertical while keeping the same lat/long in the center of the screen, 
then an HTML button could be used to perform this reorientation. That 
would involve changing the 'orientation' field in the Viewpoint node (in 
EarthNavigator.x3d). The hardest part is figuring out the new rotation 
angle and vectors.

Leonard Daly

> Hi Leonard,
>
> What better explanation than this demo (even if buggy) ?
> https://cesiumjs.org/Cesium/Apps/HelloWorld.html
>
> It looks like:
> - "turntable" mode
> AND
> - ability to change angle with the ground plan without loosing control.
>
> To sum up:
> We keep the center of globe as rotation center with mouse left click
> Right mouse rolling button is used for zoom
> AND middle button allow this famous navigation in a semi-sphere around
> the z axis (altitude).
>
> I'm currently working with three.js as a demo to suggest a working solution...
>
> Clement.
>
> On Thu, Dec 3, 2015 at 10:21 PM, Leonard Daly <Leonard.Daly at realism.com> wrote:
>> Clement,
>>
>> I am not sure exactly what kind of navigation you need to have. It seems a
>> little excessive (to me), to give up all of the geometry and texture
>> management that a declarative 3D environment provide just because the
>> built-ion navigation is not exactly what you need.
>>
>> The X3D specification include basic navigation for the environments that
>> were in use at the time. Geospatial environment were not in use then.
>> Perhaps X3D navigation should have been expanded for Geospatial, but for a
>> number of reasons it was not.
>>
>> It is possible to build custom navigation for X3D on top of the basic
>> functionality. If the desired navigation is too complex to build it on top
>> of existing capabilities, then a new navigation capability can be added to
>> the X3DOM code -- probably with about as much work as would take to add it
>> to three.js.
>>
>> Can you described in detail what you want your navigation to do?
>>
>> For example: On left button down, the use should travel at current elevation
>> about the surface on a great circle in the indicated direction.
>>
>>
>> Leonard Daly
>>
>>
>>
>>
>> Does cobweb will provide a navigation not in specifications but able
>> to decently navigate around a planet?
>>
>> I'm working with x3dom for some times but I'm going to migrate to
>> three.js just because of navigation issues... :-(
>>
>> Clement.
>>
>> On Wed, Dec 2, 2015 at 9:38 PM, Andreas Plesch <andreasplesch at gmail.com>
>> wrote:
>>
>> Hi Cris,
>>
>> try the developer version of x3dom. There have been improvements to the
>> triangulatisation of concave polygons in the last couple of weeks.
>>
>> When I view your x3d here
>>
>> http://andreasplesch.github.io/Library/Viewer/x3dweb.html
>>
>> it works fine in x3dom but has some problems in cobweb.
>>
>> Be careful when pasting in the scene to not cut numbers in the long lines in
>> half by line breaks (happened to me first).
>>
>> Hope this helps,
>>
>> -Andreas
>>
>>
>> Message: 1
>> Date: Wed, 2 Dec 2015 16:21:52 +0100
>> From: Cris Lacumba <cris.lacumba at gmail.com>
>> To: Leonard Daly <Leonard.Daly at realism.com>
>> Cc: x3dom mlist <x3dom-users at lists.sourceforge.net>,
>>          x3d-public at web3d.org
>> Subject: Re: [x3d-public] 3D wrong visualization
>> Message-ID:
>>
>> <CAF3UkD5-AEkKia5Y8Jc9Vt1FM0TFTpARGGKSRhKvjBMv9HRYHQ at mail.gmail.com>
>> Content-Type: text/plain; charset="utf-8"
>>
>> Sure,
>>
>> I have attached it.
>>
>> Thanks in advance
>>
>> 2015-12-02 16:13 GMT+01:00 Leonard Daly <Leonard.Daly at realism.com>:
>>
>> Cris,
>>
>> Is it possible to post the X3D file(s)? It's difficult for me to tell if
>> there is geometry coordinate round-off errors or something else.
>>
>>
>> Leonard Daly
>>
>>
>>
>> Hi all,
>>
>> I'm visualizing some polygons in X3DOM and they are not correctly
>> visualized.
>> In InstantReality (black background) is correctly visualized, however,
>> in
>> X3DOM I get an incorrect visualization.
>>
>> Is there some solution?
>>
>> Thanks in advance
>>
>> Best regards
>>
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>>
>>
>> --
>> Leonard Daly
>> 3D Systems & Cloud Consultant
>> X3D Co-Chair on Sabbatical
>> LA ACM SIGGRAPH Chair
>> President, Daly Realism - Creating the Future
>>
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>>

-- 
*Leonard Daly*
3D Systems & Cloud Consultant
X3D Co-Chair on Sabbatical
LA ACM SIGGRAPH Chair
President, Daly Realism - /Creating the Future/
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