Rotating

In Rotate mode, click and drag a zsphere to rotate.

ZSpheres_rotateZS

Click and drag a child zsphere to rotate it about its parent.

ZSpheres_rotateLink

Click and drag a gray link-sphere to reposition the chain around the parent zsphere.

Remember to preview the mesh by pressing A.

ZSpheres_twistP

Here the flow has become twisted.

ZSpheres_twist

Alt+click and drag a zsphere to adjust the twist.

ZSpheres_Notwist

Here the flow has been corrected.