Thankyou all,
  The link from x in the index did not help me, because it led me to the use of
x as a field of a point.
Henri

Alain <aze### [at] qwertyorg> wrote:

> > Hi,
> >    The documentation says that for a camera  right and up have default values
> > related to x and y.
> > Unfortunately I havent worked out what x and y you are referring to.
> >
> >
> >
>
> x, y, and z refer to the cartesian axis.
>
> The default camera: (used if you don't define any camera)
>
> camera{
> perspective
> location 0  // or <0,0,0> Located at the origin
> look_at z   // or <0,0,1>
> up y        // or <0,1,0> This is the "y"
> sky y       // Usualy, up and sky are the same
> right 4/3*x // or <4/3,0,0> for the usual 4:3 aspect ratio.
> //This is the "x"
> direction z // or <0,0,1>
> // +x is to the right, +y is up and +z is forward.
> }
>
> At 1 unit in front of the camera, you see verticaly from -1*y to +1*z
> and horizontaly from -4/3*x to +4/3*x, or this square:
> <-4/3, -1>,<4/3, 1>
>
>
>
> Alain

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