"Rollin"
for(float i,z,d,s;i++<5e1;){vec3 p=z*normalize(FC.rgb*2.-r.xyx);p.z+=8.;p.yz*=mat2(cos(t+vec4(0,11,33,0)));z+=d=.2*max(.2+abs(s=dot(cos(p),cos(p.yzx/.6))),length(p)-4.);o+=(cos(p.y+vec4(6,1,3,0))+1.5)/d;}o=tanh(o/1e3);