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Re: cg: sphere appearing oval
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wmc...@cgl.uwaterloo.ca
Jun 24, 2013, 5:08:01 PM6/24/13
to wmcowan
In the words of a perspicacious cs488 student,
> --90e6ba5bc6d1c4ac7104dfec4331
> Content-Type: text/plain; charset=ISO-8859-1
>
> Hi :
>
> I've been trying to figure out why my ray-tracer make a sphere look
> like an oval when the sphere is shifted far from the origin. When the
> sphere is high ( large y value ), it becomes a tall oval, when it's shifted
> to the right ( large x value ), it becomes a flat oval.
>
> I don't see how a sphere could ever appear to be an oval. But I can't
> think of what I did wrong. Could anyone give any suggestions?
>
Hi,
It looks oval because it is oval; the question is why artists always
draw it as circular. I'll discuss the geometry at the beginning of
class tomorrow.
Bill
> --90e6ba5bc6d1c4ac7104dfec4331
> Content-Type: text/plain; charset=ISO-8859-1
>
> Hi :
>
> I've been trying to figure out why my ray-tracer make a sphere look
> like an oval when the sphere is shifted far from the origin. When the
> sphere is high ( large y value ), it becomes a tall oval, when it's shifted
> to the right ( large x value ), it becomes a flat oval.
>
> I don't see how a sphere could ever appear to be an oval. But I can't
> think of what I did wrong. Could anyone give any suggestions?
>
Hi,
It looks oval because it is oval; the question is why artists always
draw it as circular. I'll discuss the geometry at the beginning of
class tomorrow.
Bill
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