Hopefully someone can help or tell me why what's happening is.  I've taken
one isosurface object and CSG'd it with another to produce a tube-like
object.  Unfortunately the inner surface of the tube isn't visible and
makes anypart of the tube behind the inner part (from the camera's angle)
transparent.  Anyone know what's going on?  Here's my code with the object
cross-sectioned so you can see what I'm talking about.

#declare R1=3;
#declare tor1=
isosurface{

function{sqrt(pow(sqrt(pow(x,2)+pow(z,2))-R1,2)+pow(y,2))-(atan(x/(abs(z)+.0000001))/pi+1)}
  contained_by{sphere{<0,0,0>,5}}
}
#declare tor2=
isosurface{

function{sqrt(pow(sqrt(pow(x,2)+pow(z,2))-R1,2)+pow(y,2))-(atan(x/(abs(z)+.0000001))/pi+.8)}
  contained_by{sphere{<0,0,0>,5}}
  inverse
}
intersection{
  object{tor1 pigment{Green}}
  object{tor2}
  plane{y,0}
  pigment{Red}
}

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By default only the first surface is found, so for transparent or CSG'ed
isosurfaces you put the keyword 'all_intersections' in the isosurface
definitions.

Hope this helps,

Mike Andrews.

"mienai[AT]hotmail.com" <mienai[AT]hotmail.com> wrote:
> Hopefully someone can help or tell me why what's happening is.  I've taken
> one isosurface object and CSG'd it with another to produce a tube-like
> object.  Unfortunately the inner surface of the tube isn't visible and
> makes anypart of the tube behind the inner part (from the camera's angle)
> transparent.  Anyone know what's going on?  Here's my code with the object
> cross-sectioned so you can see what I'm talking about.
>
> #declare R1=3;
> #declare tor1=
> isosurface{
>
>
function{sqrt(pow(sqrt(pow(x,2)+pow(z,2))-R1,2)+pow(y,2))-(atan(x/(abs(z)+.0000001))/pi+1)}
>   contained_by{sphere{<0,0,0>,5}}
> }
> #declare tor2=
> isosurface{
>
>
function{sqrt(pow(sqrt(pow(x,2)+pow(z,2))-R1,2)+pow(y,2))-(atan(x/(abs(z)+.0000001))/pi+.8)}
>   contained_by{sphere{<0,0,0>,5}}
>   inverse
> }
> intersection{
>   object{tor1 pigment{Green}}
>   object{tor2}
>   plane{y,0}
>   pigment{Red}
> }

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"Mike Andrews" <nomail@nomail> wrote:
> By default only the first surface is found, so for transparent or CSG'ed
> isosurfaces you put the keyword 'all_intersections' in the isosurface
> definitions.
>
> Hope this helps,
>
> Mike Andrews.


Thanks, that fixed what my problem was.  Onto the next...

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