Beyond the Horizon

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The simulator traces light through curved spacetime on the GPU, which needs WebGL 2. The physics underneath it does not: the diagram below is a plan view of the equatorial plane with real null geodesics drawn across it, integrated on the processor by the same equations the shader runs. Red rays are captured by the hole, amber ones reach the accretion disk, pale ones escape. The numbers are computed from the Kerr metric, not looked up.

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