General Discussion Thread


Some people here might be interested in this – Giorgio, I hope you don’t mind my mentioning it here. Pixar is starting a shading and lighting contest, and has made a nice 3D scene available to download and render:

Anyone can download this scene in a variety of file formats (in the second link it looks like Maya, FBX, OBJ, and Blender versions so far.) This is a nice 3D scene originally made by one of the PUPS. (PUPS = Pixar Undergraduate Program, which is basically one level of internship at Pixar.)

In part because I’ve been involved with these CGTalk Lighting Challenges over the years, they asked me to be one of the judges for the contest, so if you enter anything there I’ll see it.



Is it required to use Renderman?


Yes, sorry. Of course you don’t need to use Renderman to download the scene, anyone could do that now, but if you want to enter Pixar’s contest and win the prizes you’d need to use a Pixar Renderman renderer – although the free trial version would be enough for that. Quoting from the FAQ on the forum:

Can I use other RenderMan compliant renderers?
No. Only official Pixar RenderMan plugins. This includes the RenderMan plugins for Maya, Blender, Houdini and Katana.

Can I use a previous version of RenderMan?
Yes, you can use RMS 20. As an interior scene, we encourage you to use the latest pathtracing tech (RIS) in RenderMan 21.

Will I need to submit my scene for review?
Yes. A full project is needed to be eligible to win. Pixar will provide a BOX folder for finalists to submit their project.

Official Rules:



Thanks Jeremy for sharing the news ! It will be great to see the entries for the challenge !


Ah ok, thanks Jeremy.

Too bad there is no Renderman for 3DS Max… :frowning:

Maybe the scene could be used for a challenge on here aswell? (any renderer allowed) :slight_smile:


So I’m posting this here for two reasons …

  1. So I can find it again :slight_smile:

  2. In case it can help others trying to do the same thing

For those wanting to embed a YouTube video link in a My Portfolio art project; here’s how it’s done as of this post.{VIDEOCODEHERE}&

The {VIDEOCODEHERE} is usually the code you see when selecting “Share” on a YouTube video - typically after the backslash in the string.

Select the “EMBED” tab in the desired My Portfolio art project and paste the constructed link. The video should appear as a thumbnail if all goes as expected and expand as a video once exit out of Edit Project.



first.thanks for all the challenge all are great .it would be great to have realistic model and textures which we can render and blend with real bg and so far we dont have any space scene (something Starwar-ish) yet ,thanks


Hello to all,
just an update to say thast we are gathering the new models for the new challenge. Also if any of you would like to contribute, just drop me a PM (models, suggestion and ideas very welcome :slight_smile:


there’s the thread !


I needed to use a multiple filehoster service since the assets are quite heavy. I will also add a few “fixed” links Also mirrors are very welcome !!

you can use the provided scene or just use the assets to create your own scene !


New RenderMan “Rolling Teapot” Art Challenge is live!

Check it out


Hey Jeremy,

Been a while! That scene is amazing looking forward to some artist work with it!


Here I’ve merged all the general discussion about LC


1) When people post in the old threads there is less interested and feedback.

Not certain about that; would be interested in the thoughts of others. Seems to me that a single threads isn’t going to encourage more feedback.

2) Gathering all the past challenges in one thread can help in increasing the feedback also from other users that are actually work on a different challenge.
So in this way there are only 4 thread unlocked and for people should be easier to take part to the forum.

Posts added to a thread move it to the top (recent) of the forum; otherwise, I’m not sure the difference in this point to the first point … can you provide more clarification.

My thoughts on the Lighting Challenge forum:

  1. Should clearly identify each challenge in it’s own thread - i.e. standardized thread titles. That looks to be in-place
  2. A master thread listing all the challenges should exist which also discusses guidelines. That looks to be in-place.
  3. Each lighting challenge thread should be available for members to read through, post their progress, final, and questions. The context can be specific to the challenge as another forum exists on CGTalk to discuss lighting and shaders … although in-thread questions specific to this should be fine. That looks to be in-place
  4. Sticky-threads should likely be: Master Thread Listing, Discussion Thread, and maybe the current active lighting challenge.

At the moment, it seems members only post feedback in the current active lighting challenge; not many post in the “feedback” or old lighting challenge threads.

Hopefully this post will stimulate further discussion on the future of the CGTalk Lighting Challenges forum.



Looks like the thread pertaining to portfolios has been deleted so I’ll post this information here for others looking to embed a video in their CG Society Portfolio. You have to use the following weblink format in order to embed a video:{VIDEOCODEHERE}&

{VIDEOCODEHERE} is the code found after the last backslash when you click Share YouTube video.




Just a brief note to say that some of the scenes shared in this section of CGTalk are used elsewhere by render engine makers and on rendering papers without crediting authors, which is not in the spirit of this community or the people who shared their scenes.


Thanks for the message, can you send me a pm where you’ve found the scene used ?


Links checked. LC#47 links now are on. Pls if you find any broken link let me know


All links are not working at all.


Thanks for letting me know. Checking right now


I would like to create a “repository” of ideas for lighting challenges. Please focus both on the technical and artistic aspect. Just to start the thread

  1. Realtime renders vs “traditional”
    I’m sure this one will become obsolete (hopefully). Do you think non-real time renderers are superior in some specialties ? Do you think RT renders can complete in all the fields with them or there is some niche that is still hard to colonize?
  2. Hard challenges. No matter how fast pc will become is there some problem too complex to work out or where only few render engine can succeed ? (mostrous level of displacement, non-visible light rendering, thousands of mirrors and glasses in the same scene etc. ?)
  3. Photorealistic scene still difficult to render . How can we create a Turing test for rendering ? An image with such a complex behaviour of light that would be impossible to reproduce without a believable approximation ?
    Post your ideas and answer here