I am trying to visualise 3D loci.
Example: a person is on the London Eye (a type of ferris wheel with a large capsule, see here: The London Eye's official website for the best online ticket prices, guaranteed.). She paces up and down in the capsule as it goes round. What would the path traced out by her look like in 2D and 3D? I am pretty sure I have it in 2D -a straight line the length of the capsule on a circle and repeated periodically over the circumference of the circle, but not sure about 3D.