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,1)*8.;
    p.z-=4.;
    for(j=0.;j++<4.;)
        p=abs(p-.5)*rotate3D(i/j+t,vec3(-2)),
        d=max(dot(p.zy,p.xz),dot(p.yx,p.xz))-.8,
        d-=dot(p,p)/1e4;
    e+=d;
}o+=vec4(log(p*p),1)*5./i;