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// Commented version of https://twitter.com/zozuar/status/1441384708441456651
// Google-translated (with some editing) from @gam0022's version
float i, // Ray marching loop counter
e, // Volume density (the smaller the value, the higher the density)
s, // FBM scale (and loop counter)
g, // Ray's distance (also used for tunnel twirl and camera prespective)
k = .01; // Handy constant
// Ray marching loop