It seems that you can layer a (partly transparent) texture over a single
item, but not a union. Is there some way to do this ?

eg.

#declare my_object1=
sphere{0, 1     texture {T_Wood7}}

#declare my_object2=
union
{
        sphere{<0.5,0,0>, 1 texture {T_Wood7 rotate<0,90,0>}}
        sphere{<-0.5,0,0>, 1 texture {T_Wood7}}
}

object
{
//      my_object1      // this works
        my_object2      // this doesn't
        texture {pigment{bozo scale 0.25 color_map {[0.5 rgbf 1][0.5 rgb 1]}}}
}

Thanks,

Bernard

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