[x3d-public] UnlitMaterial

[Andreas Plesch]

Thanks, Holger. x3dom currently does not have UnlitMaterial.

Andreas

On Fri, Feb 21, 2025, 7:42 AM Holger Seelig <holger.seelig at yahoo.de> wrote:

> There seems to be lot of differences across browsers:
>
> X_ITE
>
> https://create3000.github.io/x_ite/playground/?url=https://create3000.github.io/Library/Tests/Components/Shape/CompareEmissive.x3d
>
> X3DOM
>
> https://andreasplesch.github.io/Library/Viewer/index.html?url=https://create3000.github.io/Library/Tests/Components/Shape/CompareEmissive.x3d
>
> Download URL for Castle and FreeWrl:
>
> https://create3000.github.io/Library/Tests/Components/Shape/CompareEmissive.x3d
>
> Best regards,
> Holger
>
> --
> Holger Seelig
> Leipzig, Germany
>
> holger.seelig at yahoo.de
> https://create3000.github.io/x_ite/
>
> Am 20.02.2025 um 23:21 schrieb Andreas Plesch via x3d-public <
> x3d-public at web3d.org>:
>
> Looking at UnlitMaterial:
>
>
> https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4.1-CD/Part01/components/lighting.html#LightingUnlit
>
> Can UnlitMaterial be thought of as Material without light contributions ?
> Eg. on_i for all lights is 0 ?
>
> It looks equivalent but perhaps there is a subtle difference. Yeah, one
> subtle difference appears to be that the transparency field is applied to
> diffuse.a rather than emissive.a .
>
> Related, the Phong lighting in the case of on_i all zero, does not seem to
> have a way to specify an alpha for emissive ? Not sure how much use
> emissive alpha has but UnlitMaterial has it.
>
> Thanks for any input, -Andreas
>
> --
> Andreas Plesch
> Waltham, MA 02453
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>
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