maximumX = c.x() + r;
maximumY = c.y() + r;
maximumZ = c.z() + r;
} else {
minimumX = Math.min(c.x() - r, minimumX);
minimumY = Math.min(c.y() - r, minimumY);
minimumZ = Math.min(c.z() - r, minimumZ);
maximumX = Math.max(c.x() + r, maximumX);
maximumY = Math.max(c.y() + r, maximumY);
maximumZ = Math.max(c.z() + r, maximumZ);
}