Am 08.01.2016 um 22:06 schrieb Mike Horvath:
> On 1/6/2016 3:55 AM, Le_Forgeron wrote:
>> Le 06/01/2016 09:11, Thomas de Groot a écrit :
>>> On 6-1-2016 6:48, Mike Horvath wrote:
>>>> How do I create a spiral tube, like a spring? Like this:
>>>>
>>>> http://www.f-lohmueller.de/pov_tut/animate/anim16e.htm
>>>>
>>>> but a single object, not a union of spheres?
>>>>
>>>> Thanks!
>>>>
>>> In a modeller, this is pretty easy, for instance building a spiral line
>>> segment (aka a spline) and an appropriate surface to follow it. However,
>>> that may not be what you want.
>>>
>>
>> generating a spline along an helix is rather easy. Then if sphere_sweep
>> is acceptable, the problem is solved.
>>
>> Now, do you considere sphere_sweep a single object ?
>>
>>
> 
> 
> Can a spline accurately mimic a helix?

A natural, bezier or other cubic spline -- nope, not precisely.

I read somewhere that a non-uniform rational B-spline /could/ do the
trick (not sure if that's true), but POV-Ray does not support those.

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