In article <36B61CB4.435B38DC@yahoo.com>, kane <kan### [at] yahoocom> wrote:

> hey guys
> I am a novice in Ray tracing.I would like to know if it is possible
> ,let's say ,to connect two points by one segment, just one segment (not
> a torus or ...),and this without being obliged to work in  2D

Perhaps I'm not understanding the question...

you can create a cylinder with start and end points anywhere in 3D
space...so there is no obligation to work in 2D.

Now, if by segment you mean a line according to Euclidian Geometry, i.e.,
a line that has length but no depth or width, then you're in trouble.
Cylinders have to have a radius of some positive number, so you can start
will 0.01 and adjust it to make it as small as possible and still visible,
but you can't make a 1 pixel wide line like you can in most drawing
programs or paint programs.

SInce POV-Ray is a three dimensional modeller the building blocks are
spheres, cubes, cones, cylinders, and torii. There are "flat" objects such
as planes, discs, meshes, triangles, and patches, but even most of these
get assigned an "inside" and "outside" in POV-Ray

Please let me know if this helps or if I am completely off the mark...
-- 
Josh English
eng### [at] spiritonecom
www.spiritone.com/~english

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