This was a little script I threw together when I had trouble with the
coordinate system.  It helped me figure out how things would move and/or
rotate.  I'm posting it here so, perhaps, it can help others.

#declare marker =
  union {
    cylinder { <0,0,0>,<1,0,0>,.1 pigment { rgb <1,0,0> } }
    cone { <1.3,0,0>,0,<1,0,0>,.2 pigment { rgb <1,0,0> } }
    cylinder { <0,0,0>,<0,1,0>,.1 pigment { rgb <0,1,0> } }
    cone { <0,1.3,0>,0,<0,1,0>,.2 pigment { rgb <0,1,0> } }
    cylinder { <0,0,0>,<0,0,1>,.1 pigment { rgb <0,0,1> } }
    cone { <0,0,1.3>,0,<0,0,1>,.2 pigment { rgb <0,0,1> } }
  }

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