Helical Toroid
(or should I have titled this Toroidal Helix?)
After learning how a unit circle on the 2D x-y plane may be parameterized as (x,y)=(cos(t), sin(t)), extend the shape into 3D.
What if the radius R of this circle varied sinusoidally along the path orbiting the origin?
→ Drag slider r to nonzero values
→ Drag slider N to different values
What if the curve rises out of the 2D x-y plane sinusoidally to create a 3D shape?
→ Drag slider "make3D" to nonzero values
In addition to using pre-set "view" buttons, click/drag or use touchscreen gestures to adjust 3D viewing perspective.
Also check out Helix.