[x3d-public] Mantis 27.4.9 NurbSet - Change child geometry model to X3DParametricGeometryNode

[Brutzman, Donald (Don) (CIV)]

Please be assured, no new semantics and no new functionality is being proposed.  We are addressing a Mantis issue that noted the NurbsSet definition was unnecessarily restrictive.  We adjusted the specification interface to match that inclusive rationale.

 

Changes to implementations are up to them.  Since NurbsSet is a way for authors to communicate when various Nurbs nodes are coincident and potentially smoothable, it has no impact on functionality and might improve rendering appearance by enabling smoothed seams.


Thanks for your review.

 

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 https:// faculty.nps.edu/brutzman

 

From: John Carlson <yottzumm at gmail.com> 
Sent: Wednesday, May 11, 2022 10:40 PM
To: Brutzman, Donald (Don) (CIV) <brutzman at nps.edu>
Cc: X3D Public Mailing List (x3d-public at web3d.org) <x3d-public at web3d.org>
Subject: Re: [x3d-public] Mantis 27.4.9 NurbSet - Change child geometry model to X3DParametricGeometryNode

 

 

Don, I'm a bit unsure of the new semantics for NurbsSet....it includes other parametric geometry nodes which aren't NURBS? 

 

Would ParametricGeometrySet be a better name than NurbsSet, or a good addition to X3D4?

 

Is it counterintuitive to look for a "ParametricGeometrySet" inside NURBS sections?

 

How does this impact browser implementations?

 

I don't know if the standard includes parametric, implicit, etc. descriptions?

 

Are we planning on dropping X3DNurbsSurfaceGeometryNode  in the future?

 

NURBS seems a bit specialized, but at least I know I'm looking for NURBS.  Parametric seems *way* general, and should probably remain at the abstract level.

 

I have no other issues that come to mind presently.

 

I'm a bit leery of Mantis, so I will now review your next email.    My summary:  Can one include more than one abstract type in the allowable types?  That is, allow both X3DParametricGeometryNode

and X3DNurbsSurfaceGeometryNode sub node types for geometry?

 

Thanks!

 

John

 

On Wed, May 11, 2022 at 8:06 PM Brutzman, Donald (Don) (CIV) <brutzman at nps.edu <mailto:brutzman at nps.edu> > wrote:

NurbsSet should be inclusive about which nodes an author thinks can be rendered together as one smooth surface.

 

*	Mantis 27.4.9 NurbSet - Change child geometry model to X3DParametricGeometryNode 
*	https://www.web3d.org/member-only/mantis/view.php?id=700

 

*	X3D4 Architecture, NURBS component, 27.4.8 NurbsSet
*	https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-CD1/Part01/components/nurbs.html#NurbsSet

 

Since X3DParametricGeometryNode includes X3DNurbsSurfaceGeometryNode, changed all three NurbsSet geometry fields from X3DNurbsSurfaceGeometryNode to X3DParametricGeometryNode.

 

NurbsSet : X3DChildNode, X3DBoundedObject {

  MFNode  [in]     addGeometry                [X3DParametricGeometryNode]

  MFNode  [in]     removeGeometry             [X3DParametricGeometryNode]

  MFNode  [in,out] geometry          []       [X3DParametricGeometryNode]

  SFNode  [in,out] metadata          NULL     [X3DMetadataObject]

  SFFloat [in,out] tessellationScale 1.0      (0,∞)

  SFVec3f []       bboxCenter        0 0 0    (-∞,∞)

  SFVec3f []       bboxSize          -1 -1 -1 [0,∞) or −1 −1 −1

}

 

This changes X3DUOM and possibly some implementations.  Comments welcome.

 

We current intend to accept this change as resolved once X3DUOM is updated.

 

all the best, Don

-- 

Don Brutzman  Naval Postgraduate School, Code USW/Br        brutzman at nps.edu <mailto:brutzman at nps.edu> 

Watkins 270,  MOVES Institute, Monterey CA 93943-5000 USA    +1.831.656.2149

X3D graphics, virtual worlds, Navy robotics https:// faculty.nps.edu/brutzman <http://faculty.nps.edu/brutzman> 

 

_______________________________________________
x3d-public mailing list
x3d-public at web3d.org <mailto: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/20220512/0cd58031/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 5353 bytes
Desc: not available
URL: <http://web3d.org/pipermail/x3d-public_web3d.org/attachments/20220512/0cd58031/attachment-0001.p7s>