Richard Dault wrote:
> 
> Okay, here is the problem I was referring to in my last post.  I have an
> iso-sphere which I intersected with an iso-y plane.  So this should give me
> a half sphere right?  Well, it does, as long as I keep it at the origin.  As
> soon as I translate it away from the origin, I get a strange result.
> 
> In the first picture of the three spheres, they should be identical, but
> they are not.  Only the green one has the expected result.  Notice something
> else that is really strange?  Look at the shadow of the middle sphere.  The
> light source is directly above it in the x-direction, but yet the shadow is
> of a complete sphere?!?
> 
> The second image shows only the middle sphere but moved over by 1 unit.
> 
> Anyone know why this is happening?
> 
> The code is as follows:
> 
<snip>
> #declare broken =
> isosurface {
>   function {
>     ball(x,y,z) & y
>   }
<snip>

	Why do you intersect your plane with a sphere? Does the problem still
occur if your function is simply 'y'? (nonetheless, I don't think there
should be a problem with your scene so I think it's a bug...)


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