Blender for Production - Blender to NUKE Workflow - 03 World Position Passes for NUKE & Customs AVOs

In this tutorial, we will talk about the Blender Data passes and how to set them up, so that they can be used in NUKE correctly. Out of the box, there are many problems with these passes, because the coordinate systems don't match and Geometry and Cameras from Blender don't match the EXR Data passes, which you will extract in NUKE. We will analyze these problems, solve them, and then build solid solutions for production. Additionally, we will define with the help of Custom AVOs inside of Blender important passes like World Position Passes, UVs and other helpers.
If you have questions or topics, which should be added, please let me know.
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Want to start learning Blender Fundamentals with Helge?
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These topics are covered:
Render Layers
Shadow AOVs
World Position Pass
Defining a Shader AOV
Adding AOV Outputs in the Shader
Debugging Custom AOVs in the Viewport
Understanding a World Position Pass
Geometry Node
Collecting the AOV data
Adding a new Render Layer
Render Filters
Fake User Importance
Render Layer Material Override
Compositor Editor for Output
Render multiply layers
WPP Exr in NUKE
Position to Points Node
NUKE's 3D Space
Solving the Orientation problem
Exporting ALEMBIC (abc) from Blender
Importing ALEMBIC into NUKE
Building a 3D Scene in NUKE
Adding a second Viewer
Adjusting the coordinates with Shuffle
Expression Node
Correcting the Normal Vectors
Storing a NUKE Preset
Setting up a Blender Utility Shader
Shuffle Positions in a Blender Shader
Separate RGB / Combine RGB Node
Using the Blender Math Node
Package the Blender for NUKE Utility Shader
If you want to learn more about NUKE, you find here my free playlist "NUKE Practice Hour"
• NUKE Practice Hour
This tutorial series „Blender for Production“ focuses on Blender as a full Production Suite for (Indie) 3D- & VFX Productions. In these tutorials, I will explain how to work with the different Modules of Blender and how they are connected. I will give you an introduction to the specific functionalities, but also the production context and workflows, which can help you to use Blender in your productions.
As a Senior 3D & VFX Trainer, Helge Maus teaches 3D- & VFX Applications for 20 years. His focus lies on VFX, but he also works with many studios and agencies from different visualization areas. He focuses on Houdini FX, Blender, and NUKE for his daily work and training.
If you have questions or topics, which should be added, please let me know.
If you want to support Helge Maus for publishing more free tutorials you could join his Patreons:
/ pixeltrain3d
And if you want to have the exercise files here is the Gumroad link. These files are available for free for my Patreons: gum.co/VWFzTN
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[@chanofeles]

It's sad that I can not like this video twice!! Thanks a lot for this content.

[@InLightVFX]

Yes, this is sooo helpful! Thanks so much.

[@Wintermute95]

Insane ! i finally understand how to make custom AOV and how to configure a 3D scene in nuke... In the SAME VIDEO ! ur my hero of the day

[@kartikeye]

Thank you so much for this. Please make more Nuke and BlendertoNuke tutorials. These are great help.

[@AnnisNaeemOfficial]

THANK YOU SO MUCH!!!

[@ppsystems4317]

Thanks for this great tutorial. it is really the best one who explained very well the World Postion Pass. Keep the great work

[@barracodigital]

Thank You Man! Amazing tutorial.

[@salvadorjimenez51]

The best!! Thank you very much!

[@turjoturjo7422]

Thank you so much for this tutorial ❤️ Keep it up!

[@nitinkadam20]

Awesome..

[@final.pictures]

Most informative tutorial about the topic I've ever seen. But I was shocked at how the blender's utility passes are not optimized for nuke. Maybe there is some way to change the coordinate system in nuke to get the correct import from blender right away?

[@pixeltrain3d]

Qhy should they be? Every DCC has it's own ideas of coordinate systems, depthpasses, etc . It's all over the pipeline. So it's very common do deal with that. Hope it will get better in the future ...

[@MateoMunton]

Great video, would turining on the normal and position passes and then placing a separate and a combine xyz nodes to reshuffle the channels between the renderpass and the file output do the trick?? I feel its quicker and this would eliminate the need for a separate render layer.

[@pixeltrain3d]

There was no position pass when I captured this tutorial. I think, today I would do it maybe different :-) Your solution sounds plausible :-)

[@imleozx2808]

can you make a tutorial on objects space pass ?

[@VisualistAyush07]

This is great.I want to learn nuke can you please suggest me some of our tutorial

[@pixeltrain3d]

Hi, I don't have a full list of NUKE learning tutorials at the moment. But you can start with this short series: kzbin.info/www/bejne/kGTYhJt8mLtpn9E Have fun!

[@VisualistAyush07]

@@pixeltrain3d thank you 😄

[@plvg_design]

just finished #2 ... wow so good I went from being confused to being able to make my blender renders look even better in nuke. I am curious, is ist just multiply to add Shadow / AO?

[@pixeltrain3d]

Yes, Shadows are multiplied. You can change the amout through the opacity. If you what a Color tint in it or you need more texture, I somethines use the shadows as Masks for graded footage ...

[@RahulVenugopal]

Nice one, anyone able to do Projection based on Pworld from Blender?

[@SishirBhandari]

super helpful. :) but i cant make the motion vectors work. can you make one including vector blur.

[@turjoturjo7422]

Hi. How can i get volume z-depth from blender to nuke? I want to get z-depth data for Volumes (smoke, fire etc) Plz help Is it possible to use custom AOV for it?

[@pixeltrain3d]

You mean deep data for Volumes? No, that's not possible with Cycles yet. But if you really need them for NUKE Deep Compositing you can use Renderman for Blender. Have tested it and it works.

[@ppsystems4317]

Hello Helge, I have a strange question. When I import the position plate(wpp.001.exr) with "PositiontoPoints"- Node in Nuke I have a thickness for the floor. I have sent you an e-mail with the picture to clarify. I did the same instructions as in your video. I work with Nuke V13.0v1. Thanks a lot for the great work

[@pixeltrain3d]

Hi, thanks for bringing that up. I have written you an email. Here are the steps for all of you: Yes, the problem is, that NUKE 13.1 now uses hydra (Storm) as the 3D-Viewport renderer. So the points are now much thicker than before. The data is still lthe same. You can do the following options: 1. change the Viewport settings For this hover over the Viewport, press the S-Key. In the Viewport properties in Tab „3D“ change the renderer to „Nuke“ 2. reduze the points size For this go into the settings in the PositionToPoints node and change there the points size to 0.1 or so.

[@___x__x_r___xa__x_____f______]

does anyone know where Helge talks about color management, ie what color space to export CG in Aces to Nuke?

[@turjoturjo7422]

How can we get lightgroups? I want to change the intensity and color of lights in nuke after render is complete

[@pixeltrain3d]

Hi, Lightgroups are not supported in standard cycles at the moment. There is a patch for that. If you want to try that, download the Blender Bonestudio build (search for it on GraphicAll).

[@iryna_perepichay]

Senks