Technical stuff about visualizing BH (Hollywood helpers)

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Discussion Overview

The discussion centers around the visualization of black holes and wormholes as depicted in the movie Interstellar, exploring the intersection of general relativity theory and visual effects in film. Participants reference academic papers that detail computational methods and visual techniques used to create realistic representations of these phenomena, as well as additional resources for understanding the geometry involved.

Discussion Character

  • Technical explanation
  • Exploratory
  • Conceptual clarification

Main Points Raised

  • Some participants highlight a paper discussing how elementary relativity concepts inform the wormhole visualizations in Interstellar, including computational methods for creating embedding diagrams.
  • Others mention the development of a code called DNGR for rendering images of a spinning black hole, emphasizing its role in achieving high-quality visual effects without flickering.
  • A later reply introduces Corvin Zahn's older work on visualizing 3D wormholes, noting the effectiveness of his videos in illustrating the geometry through reference grids.
  • Some participants express interest in the pedagogical aspects of the papers, suggesting they may be useful for students learning about general relativity.

Areas of Agreement / Disagreement

Participants generally agree on the relevance of the discussed papers and resources for understanding the visual representation of black holes and wormholes, but there is no consensus on the implications or interpretations of these visualizations.

Contextual Notes

Limitations include the potential for varying interpretations of the visualizations and the dependence on specific computational methods that may not be universally applicable. The discussion does not resolve the complexities of the underlying physics or the artistic choices made in the film.

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http://arxiv.org/abs/1502.03809
Visualizing Interstellar's Wormhole
Oliver James (1), Eugenie von Tunzelmann (1), Paul Franklin (1), Kip S. Thorne (2) ((1) Double Negative Ltd (2) California Institute of Technology)
(Submitted on 12 Feb 2015)
Christopher Nolan's science fiction movie Interstellar offers a variety of opportunities for students in elementary courses on general relativity theory. This paper describes such opportunities, including: (i) At the motivational level, the manner in which elementary relativity concepts underlie the wormhole visualizations seen in the movie. (ii) At the briefest computational level, instructive calculations with simple but intriguing wormhole metrics, including, e.g., constructing embedding diagrams for the three-parameter wormhole that was used by our visual effects team and Christopher Nolan in scoping out possible wormhole geometries for the movie. (iii) Combining the proper reference frame of a camera with solutions of the geodesic equation, to construct a light-ray-tracing map backward in time from a camera's local sky to a wormhole's two celestial spheres. (iv) Implementing this map, for example in Mathematica, Maple or Matlab, and using that implementation to construct images of what a camera sees when near or inside a wormhole. (v) With the student's implementation, exploring how the wormhole's three parameters influence what the camera sees---which is precisely how Christopher Nolan, using our implementation, chose the parameters for Interstellar's wormhole. (vi) Using the student's implementation, exploring the wormhole's Einstein ring, and particularly the peculiar motions of star images near the ring; and exploring what it looks like to travel through a wormhole.
14 pages and 13 figures. In press at American Journal of Physics

http://arxiv.org/abs/1502.03808
Gravitational Lensing by Spinning Black Holes in Astrophysics, and in the Movie Interstellar
Oliver James (1), Eugenie von Tunzelmann (1), Paul Franklin (1), Kip S. Thorne (2)
(Submitted on 12 Feb 2015)
Interstellar is the first Hollywood movie to attempt depicting a black hole as it would actually be seen by somebody nearby. For this we developed a code called DNGR (Double Negative Gravitational Renderer) 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 were crucial for achieving IMAX-quality smoothness without flickering.
...There are no new astrophysical insights in this accretion-disk section of the paper, but disk novices may find it pedagogically interesting, and movie buffs may find its discussions of Interstellar interesting.
46 pages, 17 figures. In press at Classical and Quantum Gravity
 
Last edited:
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First link points to the 2nd paper!
 
marcus said:
http://arxiv.org/abs/1502.03809
Visualizing Interstellar's Wormhole
Oliver James (1), Eugenie von Tunzelmann (1), Paul Franklin (1), Kip S. Thorne (2) ((1) Double Negative Ltd (2) California Institute of Technology)
(Submitted on 12 Feb 2015)
Christopher Nolan's science fiction movie Interstellar offers a variety of opportunities for students in elementary courses on general relativity theory. This paper describes such opportunities, including: (i) At the motivational level, the manner in which elementary relativity concepts underlie the wormhole visualizations seen in the movie. (ii) At the briefest computational level, instructive calculations with simple but intriguing wormhole metrics, including, e.g., constructing embedding diagrams for the three-parameter wormhole that was used by our visual effects team and Christopher Nolan in scoping out possible wormhole geometries for the movie. (iii) Combining the proper reference frame of a camera with solutions of the geodesic equation, to construct a light-ray-tracing map backward in time from a camera's local sky to a wormhole's two celestial spheres. (iv) Implementing this map, for example in Mathematica, Maple or Matlab, and using that implementation to construct images of what a camera sees when near or inside a wormhole. (v) With the student's implementation, exploring how the wormhole's three parameters influence what the camera sees---which is precisely how Christopher Nolan, using our implementation, chose the parameters for Interstellar's wormhole. (vi) Using the student's implementation, exploring the wormhole's Einstein ring, and particularly the peculiar motions of star images near the ring; and exploring what it looks like to travel through a wormhole.
14 pages and 13 figures. In press at American Journal of Physics

Here is some older work by Corvin Zahn on visulaizing 3D-wormholes, including great videos of a flight through it:

http://www.spacetimetravel.org/wurmlochflug/wurmlochflug.html

Zahn's videos contain a reference grid of rods through the wormhole, which gives you a much better idea about the geometry than just distorted background images.