On Mon, 25 Feb 2002 13:47:11 -0000, "Tom Melly" <tom### [at] tomandlucouk> wrote:

> I'm fairly sure that this has been reported before, but I can't see it mentioned
> in the most recent known bugs list. The red box specified last in the following
> code will disappear unless either Top_BC or Bottom_BC (or both) is/are commented
> out of the final union.
>
> The problem disappears with -UV

I found similiar but very strange problem today with sphere_sweeps. 

Here is scene to test this, look at comments:

camera{orthographic}

light_source{-100*z 1}

#local Show_Example=0; // render with 0..7, for 7 set -UV

#macro First(T)
  sphere_sweep{
    catmull_rom_spline 7
    <-0.50,0.25,0.50>.002
    <-0.25,0.00,0.50>.002
    < 0.00,0.25,0.50>.002
    <-0.25,0.50,0.50>.002
    <-0.50,0.25,0.50>.002
    <-0.25,0.00,0.50>.002
    < 0.00,0.25,0.50>.002
    pigment{color rgb 1}
    translate T*.5
  }
#end

#switch(Show_Example)
  #case(0)
    First(0)  // appear
  #break
  #case(1)
    First(x)  // appear
  #break
  #case(2)
    First(-y)  // appear
  #break
  #case(3)
    First(0)  // appear
    First(x)  // appear
  #break
  #case(4)
    First(0)  // appear
    First(-y)  // appear
  #break
  #case(5)
    First(x)  // appear
    First(-y)  // appear
  #break
  #case(6)
    First(0)  // disappear
    First(x)  // disappear
    First(-y)  // disappear
  #break
  #case(7)
    // with -UV
    First(0)  // appear
    First(x)  // appear
    First(-y)  // appear
  #break
#end

Any confirmation ?

POV 3.5 b 11 icl on WinNT Sp 6 PII 233 with 128 MB

ABX

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