"StephenS" <ssh### [at] ottawanet> wrote in message
news:4039e4b8@news.povray.org...
>
> The following example confuses me. I have switched the y and z
co-ordinates
> but not mirrored x. The spherical camera look to the left (+x goes to the
> left) and the box appears to the right of center. The perspective camera
> however seems to look to the right (why?) and the box appears to the left
of
> center. I would expect to have both the perspective and spherical cameras
to
> behave the same. How am I misinterpreting the direction vector?
>
> camera {
>   perspective
>   location  <0,0,0>
>   direction <0,1,0>
> //  direction <.25,1,0> // not expected
>   up        <0,0,1>
>   right     <4/3,0,0>
>   sky       <0,0,1>
> }

Um, because 'right' is still designated as a positive x direction? Even
though the rest would make +x be on the left I guess that's inverting the x
axis. I'm not 100% sure about it.

Anyway, is there some reason you can't use 'look_at' and 'angle' instead of
'direction'? I'm guessing, you did it this way to try and echo the
parameters of the two types of cameras since angle gets used differently, so
only way was this?

Bob H.

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