Deltographos::Blog

float i,j,d=.1,e; vec3 p;
for(i=0.;i++<64.&&d>1e-4;){
    p=vec3((FC.xy-.5*r)/r.y,e)*8.;
    p.xy*=rotate2D(t);
    for(j=0.;j++<4.;)
        p=abs(p/i)*rotate3D(t,vec3((p.z),(p.x),(p.y))),
        d=max((length(1.-p)),(length(1./p)))/1e4,
        d-=dot(p,p)/1e4;
    e+=d;
}o+=vec4(exp(p),1)*3./i;