The example with the two spheres does not work correctly for me. I still get
a spotted interface between them, regardless of "all_intersections".
Maybe that is a bug? I use version 3.6 (freshly downloaded).
Or it depends on the actual form of "f_sphere"? I used "#declare f_sphere =
function(x,y,z,R) {sqrt(x*x+y*y+z*z)-R}"

> One thing you can do is to write the whole thing as a single isosurface.
>
> isosurface {
>   function {
>     min(
>      max(-1/8*(x-5)*(x-5)+y, -y-1, 1-x),
>      max(-3+x+y, -y-1, x-1, z-4)
>     )
>   }
>   contained_by { box {<-2,0,-1>,<4,5,10> } }
>   threshold 0
>   max_gradient 2
>   hollow
>   texture { myTexture }
>   interior { myInterior }
> }

This gave the desired result, thanks a lot! Unfortunately it takes more
time, because the surrounding box must be larger, but it works.

Regards,
Timm.

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