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Add 360° panoramic projection pass

Michael Migliore requested to merge michael.migliore/vtk:env-proj into master

This MR introduces a new render pass called vtkPanoramicProjectionPass that renders the delegate pass in a cubemap with a 90° angle view in every six directions.
Then, those six renderings are combined in a 2D view using an equirectangular projection or an azimuthal projection (fish eye).
Those panoramic projections can be replayed in a compatible device (ie VR headset).

Here is an example of a 360° equirectangular projection when inside of a wavelet:

wavelet360

Edited by Joachim Pouderoux

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