Warp,
    It is the visibility thing that I am concerned about.  And as far as
implimenting a raytracer, its very easy to make it one sided or two.
Anyways, the reason I ask is becuase a sphere that I used my program to
convert from another format to pov, only shows half of the polygons.  I know
for a fact that the other program that writes this format does not care
about winding.
Jason


"Warp" <war### [at] tagpovrayorg> wrote in message
news:39730dfc@news.povray.org...
> Jason Miller <jas### [at] pinheirotcimetnet> wrote:
> : Does Povray care about the winding of a mesh?  As in, does it use 1
sided or
> : 2 sided polygons?  If it uses one sided, how can this be set to 2 sided?
>
>   I suppose that a 1-sided polygon is (like, for example, in OpenGL) a
polygon
> that is seen only from one side. If the polygon is turned so that the
other
> side faces the camera, then it's not rendered.
>   Povray only uses 2-sided polygons (ie. they are rendered now matter how
they
> are rotated). I don't know of any plans of adding support for 1-sided
polygons
> to povray (I'm not even sure how easy it is to make in raytracing).
>
>   (I think that many people here will answer you with the
double_illuminate
> thing, but I suppose that that was not what you are asking, but I think
it's
> that visibility thing. Correct me if I'm wrong.)
>
> --
> main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
> ):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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