Tut of the month: Nuke – Stereo3D inside Nuke

Hi,it has been a while since my last tutorial. I’m really busy at the moment but I couldn’t resist on testing the new stereo3D abilities in Nuke. And I was so impressed by the result, that I desided to write a short tutorial on how to create your own stereoscopic scene inside Nuke5. Take a look on the final result below, using the anaglyph technology to view it with Red-Cyan glasses.

red_cyan

As you can probably see, the scene is from a Tutorial DVD sold by the Gnomon School. It was usually made for a camera projection tutorial in Maya. What I’ve done now is, I recreated the whole scene inside Nuke, using 3d geometrie. I then projected the textures, using a camera inside Nuke. To go more into detail read on here

So to begin with, you have to export all the geometrie from Maya as OBJ files. Now inside Nuke go to 3D/Geometrie/ReadGeo and load in your objects. For the image input use a projection material found under 3D/Shader/Project and connect your images to the img input, and the projection camera to the cam input.

load_geo

When you take a look at your viewer and press the Tab key to switch to the 3D view, you should see your mountain textured as below.

mountain_geo

Now keep on reading in the rest of your geometrie until you have a full matte painting. In this case I used 11 obj files to build a 3d world. I added 2 additional layers, where I put a noise texture on, to add some sort of fog in the fore- and midground. The final scene can be seen below.

final_fullstereo

As you can see in the script, I had all the projection textures on a seperate layer with an additional alpha image. Therefore each texture was premultiplied before I could project it to get all the transparencies right. The Shot cam, that I used for rendering out the movie was duplicated, and I used an Axis node to offset the right eyes cam. Usually you should use the average human interoccular distance of 64mm for the offset. So when you have both cams , you should create a second ScanlineRender node.

stereo_cams

Now how can you set up Nuke to see these 2 render nodes as seperate eyes. Well press S and go to the Views tab. There you should create a second view for your right or left eye. I desided to use  my main view for the right eye and therefore added a view called left. You have now 2 views, but you don’t have a setup, where you have actually joint the 2 renderings. So in the Toolbar go to Views/JoinViews.  The node will have the 2 inputs you created before, main and left.

join_views

Nuke now knows that you have 2 different renderings for each eye. You could even output this to a single OpenEXR file using %V in your fileout path.

You won’t see an anaglyph image yet, to preview the 3D effect. To do that, simply go to Views/Stereo/Anaglyph and set it up correctly. If you want to preserve as much color detail as possible, set amtcolor to 1 and choose where your right eye is. Put on Red-Cyan glasses, and you can preview your first 3D Stereoscopic movie.

red_cyan

To get an idea of this scene watch it here (the camera distance was not set well, so there might be some sort of minor outlines)

Hope this tutorial was interesting for you guys.

Greets

Franz

  1. jayson

    wow! that looks amazing. I want to do that, but I’m not nearly nuke learned enough yet. But one of these days I’ll be ready for this tutorial. So thanks in advance. Right now I’m still trying to wrap my head around the whole layers/channels/masks/premult/over replacing shake’s wee bit more intuitive multilayer node. anyway, keep the tutorials coming, as tony the tiger says, they’re great.

    jayson.

  2. sven

    Hey Franz

    Nice test, it inspired me to start fooling around with this dual camera stuff in nuke.
    It’s fun to do and I really cant wait to find out how do work with athmospherics, lens flares glows etc etc in ‘
    ‘sterioscopic space’.
    If work allows it ill try to build something too and post a link to the qt here if you like to see it.

    greetz sven

  3. Al

    Great tutorial I would like to see a bigger screen shot of your tree could that be possible!

    Best
    Al Torres

  4. mike

    It looks like your left and right eye is reversed in the sample render you posted…

  5. admin

    This is possible though it always depends on your anaglyph glasses. Cheers Franz

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