Le 01/12/2017 à 13:46, Bald Eagle a écrit :
> clipka <ano### [at] anonymousorg> wrote:
> 
>>> This would make the sphere hollow but keeps an inner wall thickness of
>>> 0.05 units.
>>
>> That's technically impossible.
>>
>> (Well, strictly speaking something along the lines may be possible for
>> spheres, but it can't be generalized to arbitrary primitives.)
> 
> Well, technically it's possible, and practically it's done.
> This is a type of thing called an "offset curve" - such as what Dave Blandston
> does with his fancy text.  This is a feature available in graphics programs,
> probably Mathematica, CAD software, and Silhouette / Cricut type design
> programs.
> 
> The problem of course is writing a robust algorithm that does what you expect it
> to do given some general, unknown input.
> Doing this with a convex hull of points like "O" is fairly easy, the real
> problems of course come with concave shapes like "C" where things start to
> collide --- and then what?
> 
> It would be a NICE feature - but it's anything but trivial to code, which is why
> it's usually only seen in commercial software packages, and you almost always
> have to pay extra for a "pro" or "plus" version to have that functionality.
> 
> 
I second CLipka: it's technically impossible.

You can do it when all you have is mesh of triangles, but that's not
what POV-Ray is made of.

And if you want to manipulate meshes, you'd better do it in one of the
nice visual editors that exist. (I'm familiar with meshlab, but that's
not the only one)

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