float i,e,R,s,k,z;vec3 q,p,d=1.-FC.rgb/r.y;d.xy*=rotate2D(t*.3);for(q--;i++<1e2;i>85.?d/=-d,o+=(cos(vec4(1,2,4,0)+k)-k+2.)*e*.1:o){s=7.;q+=d*e*R*.1-4e-5;p=vec3(log(R=length(q))-t,acos(q.z/R),atan(q.x,q.y));for(e=--p.y;s<1e3;s+=s)e+=(z=cos(length(exp(cos(p*s)+1.4))))/s,k+=z/1e2;}