[x3d-public] X3D DTD - proposed changes for LinePickSensor

[doug sanden]

> Does anyone have examples, or able to work on examples, that you are willing to contribute?

http://dug9.users.sourceforge.net/web3d/tests/PickSensor/
try linepickB.x3d, linepick_geometry.x3d, linepickD.x3d
-Doug
freewrl v4 released recently for windows has picking component 
https://sourceforge.net/projects/freewrl/files/freewrl-win32/4.0/

________________________________________
From: x3d-public <x3d-public-bounces at web3d.org> on behalf of Don Brutzman <brutzman at nps.edu>
Sent: March 1, 2017 12:06 PM
To: Jan Danek; X3D Graphics public mailing list
Cc: Vojtech Pekar; Jan Houska
Subject: Re: [x3d-public] X3D DTD - proposed changes for LinePickSensor

1. We received excellent technical feedback that X3D DTD for LinePickSensor does not include Shape.  Email excerpt follows, copied for continuity in the mail archives.

> *From:*Jan Danek [_mailto:Danek at humusoft.cz_]
> *Sent:*Tuesday, January 31, 2017 9:14 AM
> *To:*Brutzman, Donald (Don) (CIV) < _brutzman at nps.edu_ <mailto:brutzman at nps.edu> >
> *Cc:[...]
> *Subject:*X3D DTD - proposed changes
>
> Dear Don,
>
> As I told you some time ago, we work on implementation of X3D Picking component in our Simulink 3D Animation viewer.
>
> Working on it we noticed a mistake in the v 3.3 DTD. Please see attached DTDs. In the original file, there was "Shape" missing in the pickTarget section for the LinePickSensor, line 3222.

For Web3D members, the issue is being tracked as Mantis issue 1141

        http://www.web3d.org/member-only/mantis/view.php?id=1141

There are 4 *PickSensor nodes that pertain:  LinePickSensor|PointPickSensor|PrimitivePickSensor|VolumePickSensor.

        38 Picking component
        http://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/components/picking.html

        38.4.1 LinePickSensor
        38.4.3 PointPickSensor
        38.4.4 PrimitivePickSensor
        38.4.5 VolumePickSensor

Typical node signature:

LinePickSensor : X3DPickSensorNode {
   SFBool   [in,out] enabled                 TRUE
   SFNode   [in,out] metadata                NULL      [X3DMetadataObject]
   MFString [in,out] objectType              "ALL"     ["ALL","NONE","TERRAIN",...]
   SFNode   [in,out] pickingGeometry         NULL      [IndexedLineSet|LineSet]
   MFNode   [in,out] pickTarget              []        [X3DGroupingNode|X3DShapeNode|Inline]
   SFBool   [out]    isActive
   MFNode   [out]    pickedGeometry
   MFVec3f  [out]    pickedNormal
   MFVec3f  [out]    pickedPoint
   MFVec3f  [out]    pickedTextureCoordinate
   SFString []       intersectionType        "BOUNDS"  ["GEOMETRY"|"BOUNDS"|...]
   SFString []       sortOrder               "CLOSEST" ["ANY"|"CLOSEST"|"ALL"|"ALL_SORTED"]
}

The line of interest is for pickTarget field:

   MFNode   [in,out] pickTarget              []        [X3DGroupingNode|X3DShapeNode|Inline]

Some support for Shape exists already in the DTD.  Proposed fix is to make it all consistent, such as

<!ELEMENT LinePickSensor (IS?, (%MetadataNodes;)?, (IndexedLineSet | LineSet | %WildcardNodes;)?, (%GroupingNodes; | %ShapeNodes; | Inline | %WildcardNodes;)* )>

This fix has been applied and will be part of next release.


2. The X3D Examples open-source online archives do not have any LinePickSensor test scenes, nor tests of any other picking nodes.  This is a problematic gap.

Does anyone have examples, or able to work on examples, that you are willing to contribute?


3. Jan reports that Humutech is "also are under impression that we are the first ones trying actually to implement this Picking Component (we didn't find anything on the Net)."

Do any of the other players implement the PickSensors?  The following page may be a bit out of date, but has some clues:

=================================
Player support for X3D components
http://www.web3d.org/wiki/index.php/Player_support_for_X3D_components

Players         BS Contact      FreeWRL H3DViewer       InstantPlayer   OctagaVS Player
Picking sensor  no              yes     no              no              no

OpenVRML        SwirlX3D        view3dscene     Xj3D    Heilan  Pivoron         Flux    Vivaty
no              no              none            yes     no       ?              yes     yes
=================================

4.  DOCTYPE DTD changes to follow for X3D v3.0-3.3 and experimental v4.0.  Continued testing, reporting and improvement welcome.

Thanks to Web3D Consortium infrastructure support and all efforts by X3D Working Group and our X3D community.

Looking forward to having fun with X3D pick sensors!

all the best, Don
--
Don Brutzman  Naval Postgraduate School, Code USW/Br       brutzman at nps.edu
Watkins 270,  MOVES Institute, Monterey CA 93943-5000 USA   +1.831.656.2149
X3D graphics, virtual worlds, navy robotics http://faculty.nps.edu/brutzman

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