[x3d-public] text size clarification

[GPU Group]

http://dug9.users.sourceforge.net/web3d/tests/Text/Text_size_spacing.x3d
- nist spacing scene
http://dug9.users.sourceforge.net/web3d/tests/Text/text_size_spacing.jpg
- freewrl rendering

On Thu, Oct 24, 2019 at 5:33 PM Brutzman, Donald (Don) (CIV) <
brutzman at nps.edu> wrote:

> Curiously when tested in 2 browsers, X3DOM did not size the inset or
> layout text equivalently.  Image attached for Internet Explorer and Firefox
> (Windows 10).
>
> On 10/24/2019 3:48 PM, Brutzman, Donald (Don) (CIV) wrote:
> > On 8/19/2019 6:46 AM, Andreas Plesch wrote:
> >>
> https://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/components/text.html#f-Textsizeandspacingfields
> >>
> >> shows how text is sized with the size field.
> >>
> >> The example text does not have any letters which reach below the
> baseline, such as g,j,p, or y, or underscore _. The figure implies that a
> spacing of 1 would mean that such letters overlap with the line of text
> below. But this is in conflict with the assumption that as the default
> value a spacing of 1 should give a readable display for most content.
> >>
> >> So should the baseline rather be at the level of the underscore _ ?
> >> Does a size of 1 mean the letter X is ca. 1 unit tall ?
> >> Or does it mean that _X in combination is ca. 1 unit tall ?
> >>
> >> Here is how dev. x3dom sizes letters. The square is a unit square,
> centered at the origin:
> >>
> https://raw.githack.com/x3dom/x3dom/master/test/regression-suite/test/cases/text/text.html
> >>
> >> -Andreas
> >> --
> >> Andreas Plesch
> >> Waltham, MA 02453
> > Apologies for missing this note 2 months ago (just before flying to
> Japan for ISO X3D meeting).  Apparently everyone else did too.
> >
> > Andreas, might you have suggested prose for a spec revision?
> >
> > Also wondering how X_ITE, view3dscene and FreeWrl handle this.
> >
> > Also wondering how HTML5.2 handles this.
> >
> > Now entered as Mantis issue 1265
> > https://www.web3d.org/member-only/mantis/view.php?id=1265
> >
> > Nicholas, I seem to recall your addressing font spacing as part of IRVE
> at some point... and so you have good fortune to be assigned issue
> responsibility (for how everyone will view 3D text, for approximately
> forever).  Hope that is OK!  8)
> >
> > all the best, Don
> >
>
>
> 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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