[x3d-public] Notation of X3Dv4 Appearance.alphaCutoff

[Holger Seelig]

I think I am fine with this decisions. In the next release X_ITE will implement Appearance alphaMode, and alphaCutoff. Besides this, X3DShapeNode castShadow, X3DBoundedBox visible, and bboxDisplay is implemented.

Best regards,
Holger

> Am 23.11.2021 um 04:00 schrieb John Carlson <yottzumm at gmail.com>:
> 
> Note: some synonyms have spotty coverage.  X3DJSAIL has setBackTexture and not setBack.  I’ve tried to support synonyms in the X3D JSON Schema.
> 
> John
> 
> On Mon, Nov 22, 2021 at 5:43 PM John Carlson <yottzumm at gmail.com <mailto:yottzumm at gmail.com>> wrote:
> It appears that X3D4 is moving towards synonyms for field names (see X3DUOM), but that’s likely not fully addressed in X3DJSAIL yet.
> 
> Whether different case is supported in synonyms, IDK.  Kinda wonky.
> 
> John 
> 
> On Mon, Nov 22, 2021 at 5:34 PM Michalis Kamburelis <michalis.kambi at gmail.com <mailto:michalis.kambi at gmail.com>> wrote:
> Nice catch.
> 
> Yes, the spelling of "Appearance.alphaCutoff" with lowercase "o" was
> deliberate... to be consistent with glTF property with *exactly* the
> same name, "alphaCutoff" . We also have "Appearance.alphaMode"
> matching glTF "alphaMode" closely.
> 
> See glTF spec: https://www.khronos.org/registry/glTF/specs/2.0/glTF-2.0.html#reference-material <https://www.khronos.org/registry/glTF/specs/2.0/glTF-2.0.html#reference-material>
> 
> I honestly blatantly didn't think to check the spelling of
> "SpotLight.cutOffAngle" . I missed the fact that we are, in effect,
> inconsistent with it.
> 
> I do not have a strong opinion about the resolution. We can
> 
> 1. leave things as-is. So we remain consistent with glTF, but
> inconsistent with "SpotLight.cutOffAngle".
> 
> 2. rename the field to have uppercase "O", making
> "Appearance.alphaCutOff". So we remain consistent with
> "SpotLight.cutOffAngle", but inconsistent with glTF.
> 
> Normally I'd say that AD 2 is better (better to be consistent with
> ourselves), but in this case "alphaMode" and "alphaCutoff" are both
> very directly from glTF, and the "SpotLight.cutOffAngle" seems
> "further away" in terms of concepts (the spot light cut-off angle
> talks about a very different thing, not related to alpha
> interpretation). So... I'm really on the fence, and can accept any
> resolution. Waiting for others' opinions!
> 
> Regards,
> Michalis
> 
> pon., 22 lis 2021 o 21:42 Holger Seelig <holger.seelig at yahoo.de <mailto:holger.seelig at yahoo.de>> napisał(a):
> >
> > 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 <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 <https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-CD1/Part01/components/lighting.html#SpotLight>
> >
> > Holger
> >
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