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ACES working space

Brecht Van Lommel
 

Hi all,

In trying to make functions like blackbody() work correctly with ACES working spaces, I found no way in the API to do it. There is ShadingSystem.attribute("colorspace", ".."), which seems to only support a fixed list of color spaces defined in opcolor.cpp. That list does not include ACES.

There's a few solutions I can think of:
* Add ACES2065-1 and ACEScg to the list. Easiest solution but not the most future proof.
* Add a method to provide custom chroma values. (Or a 3x3 XYZ -> RGB matrix which is what I happen to have available already and seems simplest to extract from OpenColorIO.)
* Lookup the specified "colorspace" name in the OpenColorIO configuration and use the "aces_interchange" role to figure out how that color space relates to CIE XYZ. Possibly it could default to the "rendering" role in the config, but this would be breaking API compatibility.

I'm willing to contribute a patch for this, but would like to know which solution would be preferred, or if I'm missing an existing solution..

Regards,
Brecht.


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Re: How can I store global variables one by one in an array?

Larry Gritz
 

Hi, sorry for letting this sit for a long time without a reply, but I'm still not sure I understand what you're trying to do.

If you are tracing rays in some order, when tracing one particular ray, you don't yet know where all the other rays (that you haven't trace yet) are going to hit. So you don't know when you're shading what all the other P's will necessarily be, if that's what you're trying to find out.

Are you asking for the vertices of the mesh of the geometry that you hit?

Are you just trying to find out which side of the surface a light is? The variable Ng should be the oriented surface normal, and you can compare that to the direction of the light to determine whether the light (or any other point) is in front of or behind the surface. Also dPdu and dPdv are the tangents of the surface at the shading point, and those can also be used to figure out the orientations.


On Mar 2, 2022, at 11:31 AM, トマトフライ <tomatofry.illust@...> wrote:

I know this is a silly thing to talk to a developer about.
I would appreciate it if you could share your wisdom.
 
I am trying to recreate a Raytraced Hard Shadow in Cycles in Blender.
In the original OSL, this can be easily implemented using trace().
However, Cycles does not accept "shade" parameter input.
Therefore, the result of trace() is very dirty.
 
 
So I was looking for a way to calculate shadows without relying on the "Shade" parameter.
By letting the trace rays penetrate self geometry, I was able to determine the shadows falling from other objects.
Used inner product to determine P not facing the light.
However, I was unable to achieve a way to determine the shadow cast by the self geometry on self, which is why I asked the question.
 
 
If we have an array containing P, we can determine if light is being blocked by the difference in the inner product of the vector toward the light source.
With this in mind, I asked you the question, but I regret that I could not realize it.
 
 
 
 
Would what I have in mind be realized by other means?
I hope that will be the case.
 
 
Thank you.

--
Larry Gritz





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[TAC private discussion] Google Summer of Code!

Larry Gritz
 

Good news -- ASWF has been accepted into the Google Summer of Code (GSoC) as a mentoring organization.

We require student applicants to have an accepted PR to any project they wish to apply to, as a prerequisite to considering their application to be sponsored to work on that project. It can be (and should be) very small, something that a new person can do in one day, just to show that they are able to check out the code, make it build, make a change, and interact with the community and code review process.

This is a good time for any of you reading this to (a) look over our Issues list on GitHub and if you see anything that fits that description, make sure it has the "good first issue" tag, and/or (b) ADD issues for things you know should be done and fit these criteria -- it's a good chance to enumerate any small tasks that we wish somebody would do, but are perhaps not high enough priority for any of the primary developers to have allocated time to tackle.



Begin forwarded message:

From: "Carol Payne via lists.aswf.io" <Carolp=netflix.com@...>
Subject: [TAC private discussion] Google Summer of Code!
Date: March 7, 2022 at 10:02:55 AM PST
Cc: Rachel Rose <rrose@...>, Alix Robinson <arobinson@...>, Karen Ruggles <karenruggles@...>
Reply-To: Carolp@...

Hi all!

It's my pleasure to announce the ASWF has been accepted into GSoC 2022! Yay! We don't yet know how many "slots" we have but as soon as I know, you all will.

The official announcements are coming from Google today, at which point we can share on social, etc (Alix, let's talk?) but wanted to get the ball rolling on two things:

1) Please take the time as project/WG TSCs to make sure your "good first issue" tags in your repos are updated. Part of the required application process for our org is a quick PR to show basic competence in github, getting the project built, and following contribution guidelines. Let me know if I can help here in any way!

2) If you volunteered to be a mentor (TAC reps please pass this on to your other mentors), please join the #gsoc-2022 slack channel on the ASWF instance. I'll also probably create an email list soon too, but let's get folks on slack and communicating - that's where contributors interested in applying will go first. There's likely to be a lot of questions - Karen and I will do our best to get them pointed to the right folks, but any help will be appreciated.

There will be more soon, but that's all for now!

--
CAROL PAYNE
Imaging Technologist
Creative Technologies
T 505.553.0076
5808 W. Sunset Blvd  |  Los Angeles, CA 90028


--
Larry Gritz





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Now: OSL TSC meeting ( every other week ) - 03/03/2022 #cal-notice

osl-dev@lists.aswf.io Calendar <noreply@...>
 

OSL TSC meeting ( every other week )

When:
03/03/2022
2:00pm to 3:00pm
(UTC-08:00) America/Los Angeles

Where:
https://zoom.us/j/100511909

Organizer: Chris Kulla ckulla@...

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Description:

Every other week meeting of the OSL TSC.

Meeting Agenda / Notes: https://docs.google.com/document/d/1yf0bG6eoE2EvKZBNZX3nskdTvu99ADTDTNOknCDJd1I/

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Event: OSL TSC meeting ( every other week ) - 03/03/2022 #cal-reminder

osl-dev@lists.aswf.io Calendar <noreply@...>
 

Reminder: OSL TSC meeting ( every other week )

When:
03/03/2022
2:00pm to 3:00pm
(UTC-08:00) America/Los Angeles

Where:
https://zoom.us/j/100511909

Organizer: Chris Kulla ckulla@...

View Event

Description:

Every other week meeting of the OSL TSC.

Meeting Agenda / Notes: https://docs.google.com/document/d/1yf0bG6eoE2EvKZBNZX3nskdTvu99ADTDTNOknCDJd1I/

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Event: OSL TSC meeting ( every other week ) - 03/03/2022 #cal-reminder

osl-dev@lists.aswf.io Calendar <noreply@...>
 

Reminder: OSL TSC meeting ( every other week )

When:
03/03/2022
2:00pm to 3:00pm
(UTC-08:00) America/Los Angeles

Where:
https://zoom.us/j/100511909

Organizer: Chris Kulla ckulla@...

View Event

Description:

Every other week meeting of the OSL TSC.

Meeting Agenda / Notes: https://docs.google.com/document/d/1yf0bG6eoE2EvKZBNZX3nskdTvu99ADTDTNOknCDJd1I/

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Re: How can I store global variables one by one in an array?

トマトフライ
 

I know this is a silly thing to talk to a developer about.
I would appreciate it if you could share your wisdom.
 
I am trying to recreate a Raytraced Hard Shadow in Cycles in Blender.
https://github.com/unity3d-jp/RaytracedHardShadow
In the original OSL, this can be easily implemented using trace().
However, Cycles does not accept "shade" parameter input.
Therefore, the result of trace() is very dirty.
 
 
So I was looking for a way to calculate shadows without relying on the "Shade" parameter.
By letting the trace rays penetrate self geometry, I was able to determine the shadows falling from other objects.
Used inner product to determine P not facing the light.
However, I was unable to achieve a way to determine the shadow cast by the self geometry on self, which is why I asked the question.
 
 
If we have an array containing P, we can determine if light is being blocked by the difference in the inner product of the vector toward the light source.
With this in mind, I asked you the question, but I regret that I could not realize it.
 
 
 
 
Would what I have in mind be realized by other means?
I hope that will be the case.
 
 
Thank you.


Re: How can I store global variables one by one in an array?

Larry Gritz
 

Can you tell us more about what you were TRYING to do? Not just the "what", but I really mean the "why." What task were you trying to accomplish, for which you hypothesized that the solution was needing to know all the P values of all shaded points at once?

Maybe there's another way to solve your real problem.


On Mar 2, 2022, at 10:19 AM, トマトフライ <tomatofry.illust@...> wrote:

Thank you very much for your detailed answer.
I now understand what I misunderstood about shading points.
 
I apologize for taking time out of your busy schedule.

--
Larry Gritz





Re: How can I store global variables one by one in an array?

トマトフライ
 

Thank you very much for your detailed answer.
I now understand what I misunderstood about shading points.
 
I apologize for taking time out of your busy schedule.

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