Alain <aze### [at] qwertyorg> wrote:

> > Hi,
> >
> > I've been rendering some rolling spheres across the screen, but I'm noticing
> > that the spheres start to warp at the edges of my view. I've been playing with
> > the right function and other camera parameters, but I can't seem to get it
> > right.
> >
> > This artifact appears almost like a stretching so the balls on the outside are
> > no longer perfectly spherical.
> >
> > Has anyone seen this issue before? I'm thinking its something simple I'm not
> > doing.
> >
>
> That's perfectly normal.
> A sphere define a cone with it's apex at the camera location.
> That cone intersects the view plane.
> The intersection of a cone and a plane is an ellipse.
>
> Thus, unless the sphere is at the very center of the image, giving a
> perpendicular intersection, you get a more or less exentric ellipse.
>
>
>
> Alain

Hi Alain,

Thanks you are right. After some calculating, all I have to do is render the
image larger by a desired amount, then crop the frames. Its just soooo slow to
render now, but I'm willing to wait it out to have the images correct.

THANK YOU!

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