Here the solution with example:


#version 3.1;

camera
{
  location  <20.0, 20, 20.0>
  direction 1.5*z
  right     4/3*x
  look_at   <0.0, 0.0,  0.0>
}

light_source
{
  <20.0, 20, -20.0>
  color red 1.0  green 1.0  blue 1.0
}


#macro apunta(A,B)

#declare My_V = B - A;
#declare My_a = degrees(asin(My_V.y / vlength(My_V)));
#declare My_M = <My_V.x, 0, My_V.z>;
#declare My_b = degrees(acos(My_M.z / vlength(My_M)));

rotate y * -My_b
rotate x * My_a

#end


cylinder
{
  <0, 0, 0>,  <6,5,4>,  0.2
  texture { pigment { color red 1 } }
}

cylinder
{
  <0, 0, 0>,  <6,5,4>, 0.15
  texture { pigment { color green 1 } }
  apunta(<0,0,0>,<6,5,4>)
}

cylinder
{
  -3*x,  10*x,  0.1
  texture { pigment { color red 0.5 } }
}

cylinder
{
  -3*y,  10*y,  0.1
  texture { pigment { color green 0.5 } }
}

cylinder
{
  -3*z,  10*z,  0.1
  texture { pigment { color blue 0.5 } }
}

plane
{
  y, 0
  texture { pigment { checker color rgbt <0, 0, 0.5, 0.2> color rgbt <0.5,
0, 0, 0.2> } }
}



____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

Visit POV-Ray on the web: http://mac.povray.org

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