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)*16.;
    p.z-=4.;
    for(j=0.;j++<2.;)
        p=abs(p/i)*rotate3D(t,vec3(cos(p.x),sin(p.z),tan(p.y))),
        d=max(cos(length(p.xy)),sin(length(p.yz)))/d,
        d-=dot(p,p)/1e4;
    e+=d;
}o+=vec4(exp(p),1)*3./i;