Mike Williams <nos### [at] econymdemoncouk> wrote:
> Wasn't it Mike who wrote:
> >I have been trying to create basically a cube in which the top and bottom face
> >is a 2D sine wave (egg crate pattern).  I have been able to do this using
> >isosurface, with some trouble however.  The way I found to do this was to make
> >one isosurface sine wave pattern contained by a box and then make another one
> >also contained by a box and flip it over.  My problem is that when I try to
> >merge the two objects I create, I have tried merge and union I always see a
> >middle boundary in between them.  The indicies of refraction are matched and I
> >am using fresnel reflection, so I do not see how or why I am seeing this.  If
> >anyone has any ideas on how to make this artifact go away that would be very
> >helpful.  I have posted the code I used to make the object below.
>
> You could do this:
>
> global_settings {max_trace_level 50}
>
> #declare F = function {y-4.5 + .1*sin(3*6.2832*x)*sin(3*6.2832*z)}
>
> #declare WholeThing =
> isosurface {
>   function { abs(F(x,y,z))-0.5}
>   max_gradient 2.1
>   accuracy .0001
>   contained_by { box { <-1.8999, 3.9, -1.8999>, <1.8999, 5.1, 1.8999> }}
>   material { MixedRegion }
>
>   interior {
>     ior 1.400
>   }
>   photons{
>     target
>     refraction on
>     reflection on
>   }
> }
>
> I'm getting some dark specks. I don't know if that's due to
> max_trace_level, or my lighting, or if it's a real effect caused by
> small reflections or refractions of shadowed areas. They don't happen
> with an opaque texture, so it's not due to max_gradient or accuracy.
>
> --
> Mike Williams
> Gentleman of Leisure

Yeah, This got rid of the middle layer, but mine also has the added weird
specular effect. I do not think this is real because I did not see it when I
did my way original way, just this way.

-Mike

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