test

        for ($x = $this->pos1['x']; $x <= $this->pos2['x']; $x += $this->pos2['x'] - $this->pos1['x']) {
            for ($y = $this->pos1['y']; $y <= $this->pos2['y']; $y += $this->pos2['y'] - $this->pos1['y']) {
                for ($z = $this->pos1['z']; $z <= $this->pos2['z']; $z += $this->pos2['z'] - $this->pos1['z']) {
                    $particle = clone $pk;
                    $particle->x = $x;
                    $particle->y = $y;
                    $particle->z = $z;
                    $particle->encode();
                    $particles[] = $particle;
                }
            }
        }