![]() So try thinking of these rays in the same way. Cycles is a backwards path tracer, meaning it traces rays from the camera out into the scene. Note: While thinking of how to set up some kind of material or effect, it's often useful to think of the scene in the same way that the render engine does. The lines represent the paths of light rays as they travel near the black hole. In the version on the left this circle represents a refracting sphere as described by Nightshade. ![]() The outer circle represents the approximate distance at which the bending of light becomes noticeable. The inner circle represents the event horizon, from which no light can escape (i.e. To visualize the difference, take this example image. However we can only change it's direction at a surface. We need to make light bend continuously, sort of as if it's in a medium with a changing IOR. This is really the same problem as Is it possible to change the IOR inside a volume?.Ĭan only bend light at a surface, via the refraction shader. It should be noted that refraction a completely different phenomenon from gravitational lensing. In cycles the only way we can "bend" light is via refraction, which occurs when light exits one medium and/or enters another. So, how can we render it with cycles anyway? Cycles doesn't have any support for simulating this kind of phenomenon. TL DR: Light is bent around black holes the same way the paths of planets around the sun are bent. This is why a special render engine had to be written to render the effects in Interstellar. I don't know of any render engines which take into account such corner-case complications like the bending of spacetime near gravitational bodies :P However with such a ridiculously massive object as a black hole, this effect can be quite extreme. Normally these distortions are very small, even with such big and massive objects like the sun. So light is always going straight (from it's point of view), but to us it appears to bend as it follows the "straight lines" of distorted space. The more massive the object, the more distortion. Gravity is a distortion of spacetime around objects. Light does travel only in straight lines, but it can be bent by gravity. The reason why this bending is problematic is that cycles assumes light always travels in straight lines. ![]() The trouble with this is that you need light to "bend" in a continuous arc around the black hole. It also keeps a nice warped edge when close which looks really good. This is so the refraction sphere doesn't hide behind it when up close. I should also note that I have chopped the black hole sphere in half. Any advice on that would be great! Then I can work on an accretion disc. All I need to do now is figure out a way to create an inner distortion around the very edge of the black hole. I've changed the bounce values to decrease the amount of dark patches. Have made some slight changes to accommodate for jagged edges and the warp moving away from the black hole. I have the black hole working nicely now. I've tried adding transparency nodes with ray depth, shadow ray, camera ray etc but nothing seems to be working. I have a hunch that it could be the shadow being emitted by the half sphere however I've disabled it in the 'Ray Visibility' section. I've checked all the nodes and modifiers multiple times and all is the same so I'm slightly confused as to why it's not working the same. I've tried that method but the outcome is with a black sphere. Note that I am not great at using nodes so if that's the key, could you explain in great detail? I'd love to hear any tips or suggestions to try out and experiment with them! The sphere needs to somehow warp everything around it and not itself. Is there anyway in which you can do this? I've tried adding another sphere, making it transparent and giving it a gravitational lighting effect but it just doesn't cut it. I recently saw the film Interstellar and it was fantastic! The effects blew me away and it got me in the mood to try and re create the black hole, however I haven't been able to find any information on how you can make a spherical object warp the world around it.
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