Kip Thorne provided pages of equations describing the gravitational bending of the light rays, which the animators used to code the software to render it. Everyone was surprised by the result because they didn't need to jazz it up for the screen at all. Dr Thorne expects to get at least two papers out of it: one for the astrophysics community and one for the CGI community.
Apparently some frames took hundreds of hours to render, they produced terabytes of data, and Noland had to take care not to change the camera's viewpoint and perspective too much for the shots because the lensing effect would confuse and disorientate the uninitiated viewer. It was tough enough as it stood. They even went so far as to depict how a wormhole would look, ie a three dimensional hole in space. They went a different way than I expected at the last minute with that, but that expectation only existed because the shots leading up to it made me realise what going through a 3D hole to a different locus of spacetime would look, as opposed to the 2D diagrams we all know about.
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