vec3 f=vec3(.781,.4,.92),p;for(float i,e,g,S,u,v;i++<50.;o+=exp(e0.9e3-cos(vec4(3,6,8,2)p.z-log(S)))/50.){p=vec3((FC.xy-.6r)/r.yg,g)-i/5e8;mat2 M=rotate2D(t/7.);p.yz=MM;p--;p.yx=M;S=12.5;for(int j;j++<10;p/=u)S/=u=dot(p=2.clamp(p,-f,f)-p,p);g-=e=p.z/S;}