In the past I always "differenced" objects, never a plane, and maybe that's why
I never noticed this before. Say I want a sphere with the top cut off:

difference {
    sphere { 0 1  }
    plane { y 0.8 }
    texture { T_Brass_1D }
}

Not what I want; only the top segment is kept. Logic holds that

    plane { -y -0.8 }

should do the trick, cutting away the stuff above the (inversed) plane instead
of below it. But POV-Ray doesn't seem to accept negative distances here!
How do I do this?
TIA

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