The only way the checker pattern isn't distorted is with the orthographic
camera. The distortion of the perspective camera becomes obvious at high camera
angles (this is why the panoramic camera was added). At angles -> zero the
distortion of the perspective camera is indeed negligible, since it starts to
look like orthographic projection (rays are nearly parallel). But try an angle
of, say, 150 and you know what I mean.
Believe me, at least in the principles of planar and spherical projection I was
not mistaken.

Margus

Rune wrote:
> 
> I think it's the other way around.
> The rays *does* hit the rectangle at constant intervals, the horisontal and
> vertical angle between camera rays *doesn't* remains constant. *That* is
> what causes the distortion of distances.
> An example: When the camera is perpendicular to a plane with a checker
> pattern, the checker pattern is NOT distorted.
> 
> But if you imagined a *sphere* around the camera, *then* the rays would be
> positioned more sparsely towards the sides.
> 
> Well, at least I think so :-)
>

Post a reply to this message