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

[John Carlson]

Understood, i am just trying to work through if there’s any parametric
geometry which isn’t NURBS, and is thus now inclusive in this modified
NurbsSet.

Thanks!

John

On Thu, May 12, 2022 at 8:58 AM Brutzman, Donald (Don) (CIV) <
brutzman at nps.edu> wrote:

> 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> 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
>
> Watkins 270,  MOVES Institute, Monterey CA 93943-5000 USA
> +1.831.656.2149
>
> X3D graphics, virtual worlds, Navy robotics https://
> faculty.nps.edu/brutzman
>
>
>
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