# How would I twist a torus or circle into an infinity symbol?

I can't seem to figure out how to create an animation of a zero twisting into an infinity symbol. I'm brand new to blender, and not really sure how to manipulate a torus to achieve this. Any help would be appreciated!

• – gandalf3 Oct 23 '14 at 17:00
• thanks! this got me on the right track, but I'm still pretty lost (I downloaded blender 2 days ago). I downloaded your "spinning_ball2" file, but am unsure on how to change the animation from a ball to just an infinity symbol. Sorry if I sound dumb! – John Smith Oct 23 '14 at 17:25
• Changing the maximum amount of twisting should work. I don't have time to write a complete answer atm, but here's a .blend with an example: pasteall.org/blend/32315 – gandalf3 Oct 23 '14 at 17:35
• wow, thank you very much! the blend example allowed me to see what different settings do. I appreciate the help! – John Smith Oct 23 '14 at 17:50

One way would be to do something similar to this, but with fewer twists.

I found that 100° twist with the simple deform modifier gives a pretty good infinity symbol when seen from the top:

By animating the amount of twisting (you can hover over almost any UI element and press I to insert a keyframe), you can get a result like this:

Example .blend

Quick solution I discovered as a new user:

2. Tab (edit mode) & A until everything is unselected
3. Select handles on opposite sides (say on the Y/green axis) and X to delete them
(must be deleted as a pair to keep symmetry)
4. Select the END of one of the 2 remaining handles (on the X/red axis) and rotate 180° R X 180 Enter
5. Optional: Select both handles with A, scale with: S Y 0.5 Enter

Turn it into a tube:

1. Shape: Resolution: Preview U: increase to smooth curvature
2. Shape: 3D
3. Fill: Full
4. Geometry: Bevel: Depth: increase as desired
5. Geometry: Bevel: Resolution: increase to desired smoothness of tube
6. Active Spline: Smooth should be checked

You could make a bone twist one half of the torus. Sadly, the mesh near the middle gets really thin.

• I think one of the laplacian modifiers is meant to help with that kind of thinning; don't have time to look farther right now. – StarWeaver Dec 12 '14 at 2:27

You could use Shape Keys in Object Mode add to shape keys in the mesh/Properties.

Switch to Edit Mode TAB

Select the vertices at the top and bottom (yellow) switch on proportional editing O, scale S,(adjust the influence as indicated by the white circle with your mouse wheel) constrain to y-axis Y.

Torus as an infinity symbol:

5. Apply (leave Deformation Axis as X -- the result won't look right; but...)
6. G Y -1Enter