[x3d-public] extra NavigationInfo modes, ptm

Wed Jan 29 14:56:38 PST 2020

Hi Michalis,

I took the opportunity to look at
https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-WD1/Part01/components/ProjectiveTextureMapping.html
and some of the history.

My main thought was why not reuse the existing, abstract viewpoint
nodes to define the projector characteristics. The projector node
fields just reiterate the viewpoint node fields, for the most part.
But probably there are enough differences since viewpoint mixes camera
and navigation options.

Why not follow viewpoint and use orientation as a rotation instead of
direction and upVector ? Seems more consistent and simpler.

The definition of the coordinate system for location/direction seems
to be missing. It is probably implied that it is the local coordinate
system.

Overall, it feels strange to have a global projector to affect all
appearances by default but perhaps that is the most common scenario.
The term Texture Mapping rather implies that it is a way to compute
texture coordinates for a given texture, similar to
TextureCoordinateGenerator, and on a similar level:
ProjectiveTextureGenerator. DEF/USE would allow applying it to
multiple Appearances easily.

-Andreas

On Mon, Jan 27, 2020 at 6:18 PM Michalis Kamburelis
<michalis.kambi at gmail.com> wrote:
>
> Andreas Plesch <andreasplesch at gmail.com> wrote:
> >
> > x3dom has an extra explorationMode field which restricts mouse function in examine/turntable mode.
> > zoom, pan, rotate values restrict to only these.
> > -zoom, -pan, -rotate disable these.
> > The field tends to be quite useful.
> >
> > I think x-ite implemented Projective Texture Mapping.
>
> Good news we have an implementation of PTM.
>
> I had some questions about how the Projective Texture Mapping in X3D
> v4 applies the texture -- what happens if the shape already has a
> ImageTexture, what happens if shape already has MultiTexture etc. I
> listed them on "TODO: Address how the projective texturing in spec
> affects existing textures" in
> https://github.com/michaliskambi/x3d-tests/wiki/Clarify-%22Projective-texturing%22-component#todo-address-how-the-projective-texturing-in-spec-affects-existing-textures
> . I'll test how X_ITE answered these questions.
>
> Regards,
> Michalis
>
> >
> > ---on the phone---
> >
> > On Mon, Jan 27, 2020, 3:00 PM <x3d-public-request at web3d.org> wrote:
> >>
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> >> Today's Topics:
> >>
> >>    1. Re: x3d v4 proposed changes > 2 opensource criteria > any
> >>       that are short (GPU Group)
> >>
> >>
> >> ----------------------------------------------------------------------
> >>
> >> Message: 1
> >> Date: Mon, 27 Jan 2020 12:18:39 -0700
> >> From: GPU Group <gpugroup at gmail.com>
> >> To: X3D Graphics public mailing list <x3d-public at web3d.org>
> >> Subject: Re: [x3d-public] x3d v4 proposed changes > 2 opensource
> >>         criteria > any that are short
> >> Message-ID:
> >>         <CAM2ogRfqXoH1duy9iGvX9BEmLFCpiLbYYO_HwMuR7HbYXkRvmg at mail.gmail.com>
> >> Content-Type: text/plain; charset="utf-8"
> >>
> >> INVENTORY
> >> FREEWRL
> >> * X3Dv4 Implementations
> >>    https://www.web3d.org/x3dv4-implementations
> >> 1) 43 Projective Texture Mapping
> >> x freewrl does not implement, document is mistaken
> >> 2) 23.4.4 NavigationInfo > TURNTABLE
> >> * freewrl implemented
> >> (other freewrl navmodes and related not in v3.3:
> >> DIST - explicit control over distance to pivot point for examine, turntable
> >> - touchpads don't need RMB
> >> SHIFT - turns off sensors
> >> HOVER - isOver mode (useful for touch pad - allows triggering of isOver
> >> only)
> >> PEDAL - can drag 'floating cursor' in steps
> >> SPHERICAL - like FLY: YAWPITCH except rotations constrained to viewpoint
> >> local axes)
> >> subsets of FLY: YAWZ, XY, YAWPTICH,ROLL)
> >> 3) GeoSpatial > GeoOrigin - freewrl still allows in v3.3, never deprecated
> >> in freewrl
> >> 4) The rest freewrl has not implemented
> >> /FREEWRL
> >> Does this table miss anything?
> >> /INVENTORY
> >> -Doug Sanden
> >> PS who's doing projective texture mapping? Should start with that?
> >>
> >>
> >> On Mon, Jan 27, 2020 at 11:59 AM GPU Group <gpugroup at gmail.com> wrote:
> >>
> >> > INVENTORY
> >> > FREEWRL
> >> > * X3Dv4 Implementations
> >> >    https://www.web3d.org/x3dv4-implementations
> >> > 1) 43 Projective Texture Mapping
> >> > x freewrl does not implement, document is mistaken
> >> > 2) 23.4.4 NavigationInfo > TURNTABLE
> >> > * freewrl implemented
> >> > (other freewrl navmodes and related not in v3.3:
> >> > DIST - explicit control over distance to pivot point for examine,
> >> > turntable - touchpads don't need RMB
> >> > SHIFT - turns off sensors
> >> > HOVER - isOver mode (useful for touch pad - allows triggering of isOver
> >> > only)
> >> > PEDAL - can drag 'floating cursor' in steps
> >> > SPHERICAL - like FLY: YAWPITCH except rotations constrained to viewpoint
> >> > local axes)
> >> > subsets of FLY: YAWZ, XY, YAWPTICH,ROLL)
> >> > 3) GeoSpatial > GeoOrigin - freewrl still allows in v3.3, never deprecated
> >> > in freewrl
> >> > 4) The rest freewrl has not implemented
> >> > /FREEWRL
> >> > Does this table miss anything?
> >> > /INVENTORY
> >> >
> >> >
> >> > On Mon, Jan 27, 2020 at 11:14 AM Don Brutzman <brutzman at nps.edu> wrote:
> >> >
> >> >> Thanks for writing Doug.
> >> >>
> >> >> On 1/27/2020 6:01 AM, GPU Group wrote:
> >> >> > A rule of web3d.org <http://web3d.org> is that changes to the spec
> >> >> need a least 2 opensource implementations.
> >> >>
> >> >> * Web3D Standards Adoption Process
> >> >>    https://www.web3d.org/standards/adoption-process
> >> >>
> >> >> 5.c. "Identify at least two independent and interoperable implementations
> >> >> (at least one should be open source)"
> >> >>
> >> >> > Q. are there any proposed changes that do not yet have 2 opensource
> >> >> implementations?
> >> >>
> >> >> Yes, plenty.  We have not taken a recent inventory of features yet, but
> >> >> will be tracking that at
> >> >>
> >> >> * X3Dv4 Implementations
> >> >>    https://www.web3d.org/x3dv4-implementations
> >> >>
> >> >> Our prominent open-source implementations for X3Dv3.3 include FreeWrl,
> >> >> X_ITE, X3DOM, Castle Game Engine.  Soon Xj3D will be back on the table as
> >> >> well.  There are also non-rendering X3Dv4 implementations for Java,
> >> >> JavaScript, Python, conversions and validation.  Not sure about Titania but
> >> >> presumably yes.  X3D-Editv4 is on the horizon. Interestingly everything on
> >> >> this list is open source.
> >> >>
> >> >> Hoping that FreeWrl developers are keen to keep their record-setting X3D
> >> >> support accomplishments continuing!  8)
> >> >>
> >> >> All feedback welcome, appreciate your many efforts.
> >> >>
> >> >> > Thanks,
> >> >> > Doug Sanden
> >> >> > -freewrl
> >> >>
> >> >> 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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-- 
Andreas Plesch
Waltham, MA 02453