The scene below shows that the Round_Box_.. #macro in 'shapes.inc'
doesn't work well with negative values.  The elements of
the 'negative one' are misplaced.  I didn't take time yet to
see where's the problem, but I can say that the 'old' RoundedBox
#macro by John VanSickle works as expected.

Fabien.

// ================================
#include "colors.inc"
#include "shapes.inc"

camera {location <15,50,-20> look_at <0,8,0> angle 30}

// bad
  object {
          Round_Box_Union (<-5,0,0>,<-10,15,-5>,.4)
          pigment {Red}
          }

// good
  object {
          Round_Box_Union (<5,0,0>,<10,15,5>,.4)
          pigment {Yellow}
          }

light_source {<1200,1600,1400> White*1}
light_source {<-1200,1600,-1400> White*1 shadowless}

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