[x3d-public] Notation of X3Dv4 Appearance.alphaCutoff

[Brutzman, Donald (Don) (CIV)]

Thanks for your careful checking to notice this mismatch, Holger.

The Spotlight field is legacy and field naming ought to stay stable after all this time.

The Appearance field is part of glTF and so we kept the same name capitalization for consistency.


  *   https://www.khronos.org/registry/glTF/specs/2.0/glTF-2.0.html#alpha-coverage
  *   https://github.com/KhronosGroup/glTF-Sample-Models/blob/master/2.0/AlphaBlendModeTest/README.md

So, the difference seems unfortunate but something we probably ought to live with.

There are already rules in X3D Schematron to detect mismatched capitalization, perhaps other diagnostics are possible too.

Any other opinions or ideas?

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: x3d-public <x3d-public-bounces at web3d.org> On Behalf Of Holger Seelig
Sent: Monday, November 22, 2021 12:42 PM
To: X3D <x3d-public at web3d.org>
Subject: [x3d-public] Notation of X3Dv4 Appearance.alphaCutoff

I noticed that the new field alphaCutoff is written with a lowercase o in off, and not alphaCutOff. But the field SpotLight.cutOffAngle is written with an uppercase O in Off. Is both right or should there be a correction?

Appearance:
https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-CD1/Part01/components/shape.html#Appearance

SpotLight
https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-CD1/Part01/components/lighting.html#SpotLight

Holger

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