Le_Forgeron <jgr### [at] freefr> wrote:
> Le 05/07/2010 15:24, bruno71 nous fit lire :
> > Hello,
>
> > #declare p1 = plane {<0 0 1>, 10}
> > #declare p2 = plane {<0 -0.0141 0.9999>, -10}
>
> > it should be a sphere cut by two almost parallel (xy) planes, however the second
> > plane (p2) is visualized as a perpendicular (xz) plane.
> > With:
> > #declare p2 = plane {<0 0 1>, -10}
> > everything is fine. It seems that the problem occurs when the y component of the
> > normal vector has negative sign. Is this a bug or there is something wrong in
> > this simple input file? Thanks,
> >   Bruno
>
> The comma are optional, but 0 -0.0141 is a valid expression for a single
> number... so everything is fine, you provide only 2 components for 3D
> vector, so it get extended with 0 on z (and the x part is small enough,
> so the plane is oriented like +y.
>
> Use comma in vectors.

Sorry, I just realized that I should post this message to povray.general before
reporting a bug. Anyway, thank you very much! I exported a geometry file from
another program (FLAIR) which is a user interface for a kind of experimental
design software, so actually there is a bug in the export function from FLAIR to
povray, and not in povray.

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