[x3d-public] Xj3D Extrusion improvements (bugfix of the decade!) with matching X3D-Edit updates

Sun Nov 19 17:37:57 PST 2017

Any chance we can see a fix in X3DOM?   I've been waiting...

John

On Nov 19, 2017 8:31 PM, "Don Brutzman" <brutzman at nps.edu> wrote:

> Congratulations and big thanks to Dr. Sungmin Kwon who fixed challenging
> Extrusion anomalies in Xj3D v2.1, correcting not one but seven bugs in the
> open source.
>
> Interesting slideset describing his analysis and corrections is now
> available online, along with demonstration screenshots.  Slideset is
> attached for the email archives since these techniques may be quite useful
> to other implementers as well.  Indeed since some of these bugs interact or
> occur only intermittently (such as incorrect ordering of matrix
> multiplications) the symptoms were often contradictory and corrections have
> eluded a number of people for a long time.
>
>         http://www.web3d.org/x3d/content/examples/Vrml2Sourcebook/Ch
> apter15Extrusion/Xj3DViewerExtrusionBugFix.pdf
>
> Torus example from VRML Sourcebook attached. Note that closed spine not
> only results in proper mesh stitching, but also normal vectors are
> accounted for on both ends that share points so seam-rendering artifacts
> don't appear.
>         http://www.web3d.org/x3d/content/examples/Vrml2Sourcebook/Ch
> apter15Extrusion/Figure15_12TorusXj3D.png
>
> Results of Xj3D improvements are also reflected in scene thumbnails and
> viewpoint captures for all scenes in the X3D Example Archives.
>         http://www.web3d.org/x3d/content/examples/X3dResources.html#
> Examples
>         http://www.web3d.org/x3d/content/examples/Vrml2Sourcebook/Ch
> apter15Extrusion/index.html
>         http://www.web3d.org/x3d/content/examples/Vrml2Sourcebook/Ch
> apter15Extrusion/viewpointSlideshow.html
>         http://www.web3d.org/x3d/content/examples/Vrml2Sourcebook/Ch
> apter15Extrusion/_thumbnails/Figure15_12TorusWithAxesThumbnail.png
>         http://www.web3d.org/x3d/content/examples/Vrml2Sourcebook/Ch
> apter15Extrusion/_viewpoints/Figure15_12TorusWithAxes.x3d._VP_Torus.png
>
> So here is a strong nominee for *X3D bugfix of the decade!*  8)
>
> Steady work on Xj3D improvements continues.  Latest greatest is checked
> into SourceForge trunk, details at
>         https://sourceforge.net/projects/xj3d
>         https://savage.nps.edu/Savage/developers.html#Xj3D
>
> Corresponding X3D-Edit updates have also occurred.  X3D-Edit is a free,
> open-source Extensible 3D (X3D) Graphics authoring tool for simple
> high-quality editing, authoring and validation of X3D scenes.  Xj3D viewer
> is embedded, with workflow and launch support included for numerous X3D
> browsers and X3D-capable authoring tools.
>         https://savage.nps.edu/X3D-Edit
>
> Download and auto-update instructions:
>       https://savage.nps.edu/X3D-Edit/#Downloads
>
> X3D-Edit includes improvements to the Extrusion editing pane that show
> whether crossSection and spine are open or closed, along with edit buttons
> to open/close either.
>         https://savage.nps.edu/X3D-Edit/images/ExtrusionAttributesPa
> nel.png
>         https://savage.nps.edu/X3D-Edit/images/ExtrusionCrossSection
> Panel.png
>         https://savage.nps.edu/X3D-Edit/images/ExtrusionSpineScalePa
> nel.png
>         https://savage.nps.edu/X3D-Edit/images/ExtrusionOrientations
> Panel.png
>
> An embedded comment within the edited Extrusion can be helpful for keeping
> track of the declared geometry's computed open/closed properties. Example:
>
>         <Extrusion crossSection='-3.5 -1 -2.1 2.9 2.2 2.9 3.6 -1 0 -3.5
> -3.5 -1' scale='1 1 1 1 0.2 0.2' spine='0 0 0 0 1 0 0 1.6 0'>
>           <!-- spine is open, crossSection is closed -->
>         </Extrusion>
>
> Some curiosities about Extrusion remain, we are further considering "edge
> cases" presented originally by Seva, see scene links in exemplar scene.
>
>         http://www.web3d.org/x3d/content/examples/Basic/X3dSpecifica
> tions/ExtrusionEdgeCases.x3d
>         http://www.web3d.org/x3d/content/examples/Basic/X3dSpecifica
> tions/ExtrusionEdgeCasesIndex.html
>         http://web3d.org/pipermail/x3d-public_web3d.org/2016-January
> /004184.html
>         www.web3d.org/member-only/mantis/view.php?id=923
>
> Additional X3D-Edit improvements to be thankful for:
> -  improved cursor/caret handling when editing scenes (hooray, finally) and
> - consistent Viewpoint Rotation Calculator interfaces for Viewpoint,
> OrthoViewpoint and GeoViewpoint.  Authors are provided a similar option to
> save lookAt point as an embedded comment within the Viewpoint (also
> reloaded at relaunch).
>
>         https://savage.nps.edu/X3D-Edit/images/ViewpointCalculator.png
>         https://savage.nps.edu/X3D-Edit/images/ViewpointCalculatorCo
> mposed.png
>
>         <Viewpoint DEF='ViewUpClose' centerOfRotation='0 -1 0'
> description='Hello world!' position='0 -1 7'>
>           <!-- local lookat point: 0 -1 0 -->
>         </Viewpoint>
>
> The latest validation improvements for X3D XML Schema and Schematron rules
> are also added to the X3D Validator, both internal to X3D-Edit (checkmark
> button in author workflow) and online.
>       https://savage.nps.edu/X3dValidator
>
> Authors can learn more about Extrusion node at
>
>         http://www.web3d.org/x3d/content/X3dTooltips.html#Extrusion
>         http://www.web3d.org/x3d/content/examples/Vrml2Sourcebook/Ch
> apter15Extrusion
>         http://x3dgraphics.com/examples/X3dForWebAuthors/Chapter06Ge
> ometryPointsLinesPolygons
>         http://x3dgraphics.com/slidesets/X3dForWebAuthors/Chapter06G
> eometryPointsLinesPolygons.pdf
>         https://www.movesinstitute.org/Video/Courses/X3dForWebAuthor
> s/X3dForWebAuthorsVideo.html#6
>         https://www.youtube.com/watch?v=OezdubjTbqE&list=PLuSIsM-86s
> ilXbPFOJ43Qgn47Pw6RufeB&index=6
>
> So, lots of excellent progress.  Again thanks Sungmin for this important
> work.
>
> Have fun with X3D Extrusion!
>
> 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/brutzma
> n
>
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