Gravitational lensing by spinning black holes in astrophysics, and in the movie Interstellar

@article{James2015GravitationalLB,
  title={Gravitational lensing by spinning black holes in astrophysics, and in the movie Interstellar},
  author={Oliver James and Eug{\'e}nie von Tunzelmann and Paul Franklin and Kip S. Thorne},
  journal={Classical and Quantum Gravity},
  year={2015},
  volume={32}
}
Interstellar is the first Hollywood movie to attempt depicting a black hole as it would actually be seen by somebody nearby. For this, our team at Double Negative Visual Effects, in collaboration with physicist Kip Thorne, developed a code called Double Negative Gravitational Renderer (DNGR) to solve the equations for ray-bundle (light-beam) propagation through the curved spacetime of a spinning (Kerr) black hole, and to render IMAX-quality, rapidly changing images. Our ray-bundle techniques… 
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