To create the visual effects for the wormhole and a rotating, supermassive black hole (possessing an ergosphere, as opposed to a non-rotating black hole), Thorne collaborated with Franklin and a team of 30 people at Double Negative, providing pages of deeply sourced theoretical equations to the engineers, who then wrote new CGI rendering software based on these equations to create accurate simulations of the gravitational lensing caused by these phenomena. Some individual frames took up to 100 hours to render, totaling 800 terabytes of data. Thorne described the accretion disk of the black hole as "anemic and at low temperature —about the temperature of the surface of the sun," allowing it to emit appreciable light, but not enough gamma radiation and X-rays to threaten nearby astronauts and planets. The resulting visual effects provided Thorne with new insight into the gravitational lensing and accretion disks surrounding black holes, resulting in the publication of three scientific papers.