for(float i,g,e,s,k=t*.1;++i<99.;o.rgb+=hsv(s/15.+.5,.3,s/1e3)){vec3 p=vec3(g*(FC.xy-.5*r)/r.y+.5,g-1.);p.xz*=rotate2D(k);s=3.;for(int i;i++<9;p=vec3(2,4,2)-abs(abs(p)*e-vec3(4,4,2)))s*=e=max(1.,(8.-8.*cos(k))/dot(p,p));g+=min(length(p.xz),p.y)/s;s=log(s);} #つぶやきGLSL
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