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ReConverge

If you’re working on a stereoscopic or multi-view project, the ReConverge node lets you shift convergence (the inward rotation of the eyes or cameras) so that any selected point in the image appears at screen depth when viewed with 3D glasses. This point is called the convergence point. It is the point where the lines of sight from the two cameras meet.

At the convergence point, the different views in the image are aligned and appear at screen depth when viewed with 3D glasses. Anything behind the convergence point appears behind the screen, while anything in front of it seems to pop out of the screen.

To calculate the convergence shift, the ReConverge node needs a disparity field that maps the location of a pixel in one view to the location of its corresponding pixel in the other view. To create the disparity field, you can use The Foundry’s O_DisparityGenerator plug-in, which is part of the Ocula plug-in set. Alternatively, you can create the disparity field in a 3D application. Once you have the disparity field, you can store it in the channels of an .exr file, or use the ShuffleCopy node to add the disparity channels in the data stream where you need them.

It is also possible to use the same element as the convergence point throughout the image sequence. To do so, link the ReConverge node with a Tracker node.

To better view the effect of the ReConverge node, you can insert an Anaglyph node between the ReConverge node and the Viewer.

NOTE:  The ReConverge node only shifts views horizontally, not vertically.