[x3d-public] UnlitMaterial

[Andreas Plesch]

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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