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Post 3D Convergence

The Great Gatsby – 3D

The Great Gatsby


Director: Baz Luhrmann

DOP: Simon Duggan

Studio: Warner Bros

Senior Digital Intermediate Colorist and Stereoscopic Finishing Artist : Adrian Hauser

Grading Hardware: Baselight 8 & Baselight 2

Stereo Finishing  Hardware: Baselight 8 & Baselight 2

Acquisition Format – Red Epic 3D

Projection Format – DCI 2.39:1


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s3d stereoscopic Base and parallax / divergence calculator for Android

ScreenShots from forth coming s3D Base and Parallax Calculator for Android.

Post 3D Convergence

The repositioning of LR convergence in post helps the stereographer to smooth the edit in terms of creating a comfortable 3D viewing experience. Convergence does not effect the Depth of the Shot (inter-ocular distance). It simply focuses the eyes attention to a particular part of the 3D volume at a particular place in the 3D z Depth of the Screen.

By converging 2 points together of a stereo pair we are making that point in the image sit at the screen plane. Anything in front of that plane will appear to come forward of the screen. Anything behind that point will appear behind the screen.

FreeView 1 - Behind the Screen Plane

FreeView 2 - At the Screen Plane

Generally speaking the convergence of an object will be set at or just behind the screen plane. If we converge behind the point of interest, say at the back of someones shoulders, this would force their faces into the auditorium (in front of the screen plane). Such 3D tricks must be carefully thought through as there are  potential problems created. More on those later.

Dynamic convergence can be of help over cut points where there is little option to cut from a foreground image converged at the screen plane to a another shot where we are made to focus beyond the screen plane (Positive Parallax). By use of dynamic convergence we can ramp over time the convergence to push the viewers attention past the screen plane so as the incoming shot will make for a comfortable 3D edit.


Convergence tools and stereo repositioning tools can also help deal with objects that are “Breaking the Frame” and hence the potential cause of eye fatigue. These tools in conjunction with Floating Windows (See post) can hep cure cases of retinal rivalry where one image is present on the edge of screen in one eye but not on the other .

Adrian Hauser