[x3d-public] EnvironmentLight done?

[Brutzman, Donald (Don) (CIV)]

Thanks for analysis and updated assessment, Michalis.  Your many efforts are
appreciated.

It will be great if other implementers can look at this, as you request.
Since this is critical and inevitable, reviewing "now" sounds better than
"later" to achieve our shared goals. Having an example will help a lot too,
if somebody has one.

It looks to me like we are really close, and we certainly are not rushing.
It is important for X3D4 to finish glTF2 compatibility. If the glTF
community (which has many many implementations) is adopting EnvironmentLight
then there is perhaps-zero risk of technical error.

Might I please urge that we get as far as possible in the next few weeks,
closely compare X3D4 and glTF EnvironmentLight specifications, and then
include EnvironmentLight in May submission to ISO, where it will get one
final national-body review.

Final improvements welcome, let's please review together on a teleconference
by end of month.

Onward we go, carefully and deliberately...

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

-----Original Message-----
From: Michalis Kamburelis <michalis.kambi at gmail.com> 
Sent: Friday, April 15, 2022 4:21 AM
To: Brutzman, Donald (Don) (CIV) <brutzman at nps.edu>
Cc: X3D Public Mailing List (x3d-public at web3d.org) <x3d-public at web3d.org>
Subject: Re: EnvironmentLight done?

NPS WARNING: *external sender* verify before acting.


It is not done.

- The definition there does not describe the diffuseCoefficients in enough
detail,

- and does not describe the equations for applying the EnvironmentLight,

- It is also not fully implemented in CGE/view3dscene, nor anywhere else,
from what I know.

- The definition there is not checked for alignment with glTF
KHR_lights_environment (
https://github.com/KhronosGroup/glTF/pull/1956 ). It was only checked for
alignment with earlier glTF EXT_lights_image_based (
https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Vendor/EXT_lig
hts_image_based ), but since then the preferred Khronos approach seems to be
KHR_lights_environment, even though it is not yet finished.

Sorry, I just didn't have time to finish it. Too many tasks :)

In my defense,

- I warned multiple times that this will probably not be finished for X3D
4.0.

- KHR_lights_environment is also not finished on the Khronos side.

So let's not rush this. We should not push EnvironmentLight in X3D 4.0 spec.
I very much welcome input from X3D browser implementors to finish the
definition of it, and have multiple implementations of it in X3D, hopefully
mostly consistent with glTF, and then we're good to go :)

More info on
https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com
%2Fmichaliskambi%2Fx3d-tests%2Fwiki%2FImage-Based-Lighting-&data=05%7C01
%7Cbrutzman%40nps.edu%7C3f1d9faeeb0f4b9ce3e408da1ed21936%7C6d936231a51740ea9
199f7578963378e%7C0%7C0%7C637856185841468534%7CUnknown%7CTWFpbGZsb3d8eyJWIjo
iMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&
amp;sdata=YwspGf382BKRoaga%2BwhgBribqCbHspX4S6yfOVcLcR0%3D&reserved=0(En
vironmentLight-node)
.

Regards,
Michalis

pt., 15 kwi 2022 o 01:43 Brutzman, Donald (Don) (CIV) <brutzman at nps.edu>
napisał(a):
>
> Michalis, any lingering changes or considerations left on
EnvironmentLight, or are done?   Please advise.
>
>
>
> Mantis 1336: 17.4.2 EnvironmentLight - Khronos glTF extension for 
> image based lighting
> https://www.web3d.org/member-only/mantis/view.php?id=1336
>
>
>
> X3D4 Architecture, Lighting component, 17.4.2 EnvironmentLight 
> https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-CD1/P
> art01/components/lighting.html#EnvironmentLight
>
>
>
> 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
>
>
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