(Fix) Tear in SDF movement WIP

float get_floor(vec3 p) {
    vec3 q = p; /* save input p */
    float d = 1000.0; /* total distance */
    for (int i=-1;i<=1;++i){
        for(int j=-1;j<=1;++j){
          float space = 6.;
          float item = floor(abs(mod(p.z,0.)) / space);
          item += abs(float(j)); /* offset cell index */

          p.y += sin(iTime + item * PI / 2.) * 4.0;
          p.xz = mod(p.xz,space)-.5 * space;
          p.xz += vec2(float(i), float(j)) * space; /* offset local coordinates */

          float displacement = sin(15. * p.x) * sin(15. * p.y) * sin(15. * p.z) * .04;
          float floorBox = boxSDF(vec3(p.x,p.y + 3.,p.z), vec3(15.5, .2, 15.5));
          //+ displacement;
          float circleCut = sphereSDF(vec3(p.x,p.y + 3.,p.z),2.);

          float dd = max(floorBox,circleCut);
          d = min(d, dd); /* keep track of total distance */
          p = q; /* restore input p */
        }
    }
    return d;
}