Remco de Korte <rem### [at] onwijscom> wrote in
news:3F7CBD45.2D19A830@onwijs.com: 

> A mesh would be fairly easy to set up. Something like this:
> [...]

Wow, cool! that looks very nice!  Thanks!  I should be able to use 
smooth_triangle{} using your technique for the perpendicular normal (or 
perhaps pointing the normal to the center will ensure that the loop would 
keep a rolling ball on track?)

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