hello,


for a 3d curves defined by a sple, it's easy to define at each points of 
the cuve, the frenet frame.

but... how to draw in this new frame ?

povray has somes functions/utilities/macros to draw in the frenet frame ?
nothing found on the web...


thanks

-- 
klp

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kurtz le pirate wrote:
> hello,
> 
> 
> for a 3d curves defined by a sple, it's easy to define at each points of 
> the cuve, the frenet frame.
> 
> but... how to draw in this new frame ?
> 
> povray has somes functions/utilities/macros to draw in the frenet frame ?
> nothing found on the web...

No, POV-Ray does not currently come with any Frenet frame "drawing" tools.

I have made some macro to do this. (But I do not have time to document 
them.)

I made this image was made by placing a mesh along a Frenet frame 
following a NURBS curve and then subdividing the mesh:

   http://home.no/t-o-k/POV-Ray/Mesh-Moebius_Band.jpg

If anyone is interested, then maybe I can find time to dig up some of 
the macros and put them on my web page.


-- 
Tor Olav
http://subcube.com

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"kurtz le pirate" <kur### [at] yahoofr> wrote in message 
news:kurtzlepirate-E41D8B.18491611032006@news.povray.org...
> hello,
>
>
> for a 3d curves defined by a sple, it's easy to define at each points of
> the cuve, the frenet frame.
>
> but... how to draw in this new frame ?
>
> povray has somes functions/utilities/macros to draw in the frenet frame ?
> nothing found on the web...
>
>
> thanks
>
> -- 
> klp

Hi Kurtz,

I may be oversimplifying this, but do you just mean that you want to place 
objects relative to the frenet frame for a specific location on the spline?
If so can't you define them at the origin and transform them using 
Spline_Trans?

Regards,
Chris B.

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In article <441367cd$1@news.povray.org>,
 "Chris B" <c_b### [at] btconnectcomnospam> wrote:

> "kurtz le pirate" <kur### [at] yahoofr> wrote in message 
> news:kurtzlepirate-E41D8B.18491611032006@news.povray.org...
> > hello,
> >
> > ...
> 
> Hi Kurtz,
> 
> I may be oversimplifying this, but do you just mean that you want to place 
> objects relative to the frenet frame for a specific location on the spline?

yes


> If so can't you define them at the origin and transform them using 
> Spline_Trans?

Spline_Trans ? i dont know :( i will seek informations about that.


> Regards,
> Chris B. 

thanks for this tips. 

-- 
klp

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