#declare Xaxis =
union {
  object {
    cylinder {
      <-10, 0, 0> <10, 0, 0>
      0.1
      pigment {color Red}
    }
  }

  object {
    cone {
      <11, 0, 0> 0
      <9, 0, 0> 0.5
      pigment {color Red}
    }
  }
}

#declare Yaxis =
union {
  object {
    cylinder {
      <0, -10, 0> <0, 10, 0>
      0.1
      pigment {color Green}
    }
  }

  object {
    cone {
      <0, 11, 0> 0
      <0, 9, 0> 0.5
      pigment {color Green}
    }
  }
}         

#declare Zaxis =
union {
  object {
    cylinder {
      <0, 0, -10> <0, 0, 10>
      0.1
      pigment {color Blue}
    }
  }

  object {
    cone {
      <0, 0, 11> 0
      <0, 0, 9> 0.5
      pigment {color Blue}
    }
  }
}