[x3d-public] Fwd: Re: mantis 1252, PointProperties node specification and inclusion of Normal data

[Michalis Kamburelis]

Is there any wording that says effectively """Points/lines are rendered as
*lit* if the normals are provided"""? Because that is the purpose of
providing normals, I think.

The sentence """No effect on rendering behavior is defined for data
specified by the normal field. Rendering techniques that utilize normal
information to refine presentation of geometry are allowed but not
required.""" leaves the decision up to the browser, it seems.

Regards,
Michalis

pon., 15 cze 2020 o 08:36 Don Brutzman <brutzman at nps.edu> napisał(a):

> These changes got applied to XML Schema/DTD and X3DUOM for X3D4, also
> compiles satisfactorily under X3DSAIL.
>
> -------- Forwarded Message --------
> Subject: Re: mantis 1252, PointProperties node specification and inclusion
> of Normal data
> Date: Thu, 11 Jun 2020 11:22:02 -0700
> From: Don Brutzman <brutzman at nps.edu>
> Organization: Naval Postgraduate School (NPS)
> To: Vincent Marchetti <vmarchetti at kshell.com>
> CC: Richard F. Puk <puk at igraphics.com>, Nicholas Polys <npolys at vt.edu>
>
> FYI we came up with the following addition to the mantis issue.  We also
> applied these changes to draft X3D4 specification.  Looks good.
>
> ======================================
> Change summary for Normals:
>
> Add the following to LineSet, IndexedLineSet, PointSet
>
>    SFNode [in,out] normal NULL [X3DNormalNode]
>
> with prose
>
> "No effect on rendering behavior is defined for data specified by the
> normal field. Rendering techniques that utilize normal information to
> refine presentation of geometry are allowed but not required."
>
> Considered but not included:
>
> NOTE. Rendering of 3D scan data may choose to apply normal information for
> mesh visualization, culling or other purposes.
>
> ----
>
> 11.4.10 Normal node:
>
> "This node defines a set of 3D surface normal vectors to be used in the
> vector field of some geometry nodes (EXAMPLE IndexedFaceSet and
> ElevationGrid). This node contains one multiple-valued field that contains
> the normal vectors. Normals shall be of unit length."
>
> Interestingly that is the entire definition of the node.
>
> Replace first sentence as follows, keeping original second and third
> sentences above.
>
> "This node defines a set of 3D direction vectors to be used for the normal
> field of some geometry nodes (EXAMPLE IndexedFaceSet, IndexedLineSet,
> LineSet, PointSet, and ElevationGrid). The term 'normal' is common usage to
> indicate direction vectors, even though the direction vectors might not
> necessarily indicate perpendicularity."
>
> ---
>
> Level support table: note /normal/ optionally supported for LineSet,
> IndexedLineSet, PointSet under level 1.
>
> =====================================
>
> 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
>
> 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
>
> _______________________________________________
> x3d-public mailing list
> x3d-public at web3d.org
> http://web3d.org/mailman/listinfo/x3d-public_web3d.org
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://web3d.org/pipermail/x3d-public_web3d.org/attachments/20200615/9ede7bd5/attachment.html>