in news:41ab59ee@news.povray.org =Bob= wrote:

> Would that create the object more than once?
> 

I guess so yes, although I don't see a coincident surface effect here:

---%<------%<---
#version 3.6;
global_settings {assumed_gamma 1}
camera {location <2,0,-6.0> look_at <2,0,0>}
light_source {<500,500,-500> rgb 1}

#declare S1=sphere { <0,0,0>, 1}
#declare S2=sphere { <2,0,0>, 1}
#declare S3=sphere { <4,0,0>, 1}

#declare U12=union {
  object {S1}
  object {S2}
}

#declare U23=union {
  object {S2}
  object {S3}
}

object {
  U12
  pigment {rgb 1}
}

object {
  U23
  pigment {rgb <1,0,0>}
  //translate <0,1,0>
}
---%<------%<---
    
 Ingo

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