My name is Y.Tanabe
I am using a standard.pov which has X,Y,Z coordinate with marker.
Here is source

// Persistence of Vision Ray Tracer 3.1 Scene Description File
#version 3.1;
#include "colors.inc"
#include "textures.inc"

global_settings { assumed_gamma 2.2 }
// Set a color of the background (sky)
background { color red 0.1 green 0.3 blue 0.8 }

camera
{
    location   <0.0, 0.0, -12.0>
    right       <4/3, 0.0, 0.0>
    up          <0.0,1.0, 0.0>
    direction  <0.0, 0.0,1.0>
}

light_source { <200, 100, -300> colour White }
light_source { <-200, 100, -300> colour White }



//Cylinder
#declare Xaxis =
cylinder
{
   <-1e6, 0, 0>, <1e6, 0, 0>, 0.05
   pigment
   {
      gradient x
      color_map
      {
        [0.0    0.1          color red 1.2 green 1.2 blue 1.2 color red 1.2
green 1.2 blue 1.2]
        [0.1   1.0-0.1   color red 1.2 color red 1.2]
        [1.0-0.1  1.0          color red 1.2 green 1.2 blue 1.2 color red 1.2
green 1.2 blue 1.2]
      }
    quick_color color red 1.2
  }
}

#declare Yaxis =
cylinder
{
  <0, -1e6, 0>, <0, 1e6, 0>, 0.05
  pigment {
    gradient y
    color_map {
      [0 0.1         color red 1.2 green 1.2 blue 1.2 color red 1.2 green 1.2
blue 1.2]
      [0.1 1-0.1  color green 1.2 color green 1.2]
      [1-0.1 1       color red 1.2 green 1.2 blue 1.2 color red 1.2 green 1.2
blue 1.2]
    }
    quick_color color green 1.2
  }
}

#declare Zaxis =
cylinder {
  <0, 0, -1e6>, <0, 0, 1e6>, 0.05
  pigment {
    gradient z
    color_map {
      [0 0.1         color red 1.2 green 1.2 blue 1.2 color red 1.2 green 1.2
blue 1.2]
      [0.1 1-0.1  color blue 1.2 color blue 1.2]
      [1-0.1 1       color red 1.2 green 1.2 blue 1.2 color red 1.2 green 1.2
blue 1.2]
    }
    quick_color color blue 1.2
  }
}

#declare Axis =
union
{
  object { Xaxis }
  object { Yaxis }
  object { Zaxis }
}
#declare UnitAxis =
union
{
   object { Xaxis translate <0,-1,-1>}
   object { Xaxis  translate <0,1,1>}
 object { Yaxis  translate <1,0,1>}
   object { Yaxis  translate  <-1,0,-1>}
 object { Zaxis  translate <1,1,0>}
   object { Zaxis translate <-1,-1,0>}

}

// Show coordinate axes
object {Xaxis}
object {Yaxis}


//object


Y.Tanabe
Kobe,Japan
e-mail : tec### [at] khrimorjp
home : http://www.kh.rim.or.jp/~techflux



I Chuprov wrote:

> I'm still having a little difficulty understanding the co-ordinate system in
> POV-Ray.
> I understand about the X, Y, Z axis and the left hand rotation thingy.
> What I don't understand, is how to use the co-ordinate system to place
> objects!
> I'm always using trial and error to place objects, especially when I want to
> centre the object (e.g. a text object).
>
> Is there some easier way of placing objects??
>

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