These will be black pixels, since no photon could ever have followed that path goin forward, from inside the black hole to your eye. Now, it's true that there will be rays that, when backtraced from your eye, will end up in the event horizon. In fact, it's incorrect to say that a region of an image is an object. It's often pointed out that it's incorrect to say that the black disk is the event horizon. You shouldn't have problems making out the salient feature of the image, namely the black disk and the weird distortion ring. If you have already tried my live applet, you should be familiar with this view: Ideally, this could be of inspiration or guidance to people with a similar intent. I'm writing this page to share not only end-results such as the image above ( also because some people did it better) but also the process of building these pictures, with a discussion/explanation of the physics involved and the implementation. This is neither anything new nor is it any better than how it's been done before. The image above was rendered with this program - it took 15 5 minutes (thanks, RK4) on my laptop. This project, instead, aims to shatter these shortcoming by ditching efficiency/interactivity in the most naive way: it's a full CPU raytracer, taking all the time it needs to render pictures. It worked ok-ish, but the simulation is of course very lacking in features, since it's not actually doing any raytracing (for the laymen: reconstructing the whereabouts of light rays incoming in the camera back in time) on its own. The trick was of course to precalculate as much as possible about the deflection of light rays. This was the result (it runs in your browser). I was preoccupied by the problem of generating a decent accurate representation of how the curvature of such a spacetime affects the appearance of the sky (since photons from distance sources ride along geodesics bent by the Black Hole), for the purpose of creating an interactive simulation. ![]() My recent interest was in particular focused on simulating visualizations of the Schwarzschild geometry. It's now clear I'm on a Black Hole binge (I can stop when I want, by the way).
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