denisyilmaz/threejs-blackhole

Building blackhole raytracer with three.js.

three-js-blackhole

Screenshot

My attempt at building realtime blackhole ray tracer, reproducing [1] and [2].
They helped me a lot because I had zero knowledge to begin with.

I was fascinated by the idea of ray tracing blackhole with now popularized accretion disk around it. So I hopped in.

Features

• Left click your mouse drag to look around.
• Adjust quality for more accurate ray marching.
• Adjust bloom effect for aesthetics
• Can save as an image, allows higher resolution rendering.
• Custom Camera(Observer)
  • Orbit around the blackhole
  • Adjust field of view and distance
• Physics
  • Lorentz transform
  • Doppler shift
  • Relativistic beaming
  • Accretion disk
  • Background star color from blackbody spectrum (random and trivial velocity for red shift)

this may be a work-in-progess project(?).

Maybe

• Add fog effect

---

How it was built

• Learn how to do basic ray tracing (ex: sphere)
• Think in light's perspective (ex: raymarching)
• Apply Camera concept to shader
• Learn a bit about various physical phenomena involving light and blackhole
• Scrutinize available resources, steal(?) mathematical formulas from gathered resources because I am not a physics genius.
• Apply equations to shader.

---

License

Apache License, Version 2.0

• dat.GUI

MIT license

• stats.js
• three.js + other extra js files
• https://github.com/oseiskar/black-hole
  • Code works & derived formulae were referenced from.

CC-BY-NC 2.0

• Background image /assets/milkyway.jpg is from Stellarium and "based on Nick Risinger's Photopic Sky Survey image under CC-BY-NC 2.0." as stated in https://github.com/oseiskar/black-hole/blob/master/COPYRIGHT.md

GNU, General Public License, Version 3.0

• https://github.com/rantonels/starless
  • Original texture for accretion disk is provided by this repository. It is slightly modified to reduce the brightness at the edge.
  • Code works & derived formulae were referenced from and reproduced in GLSL.

All other files in this glitch project are hereby licensed under GPL, v3.0

This project renders schwarzchild blackhole (+ various effects).

Copyright (C) <2018>  <pizzakinggod>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.