I would like extract the coordinates (X, Y, Z) of all the intersection points in
the image. It seems the megapov function PP_Init_IPoint_Outputs can do this job.
However I tried the following code. I can not get the results expected. I can
only get the rendered image but not the coordinate information. How could I set
the filename and folder to export the results? Thanks for your help.

Shouyang

#version unofficial MegaPov 1.1;

#include "pprocess.inc"
PP_Init_IPoint_Outputs()

#declare Camera_Location = <-4,7,-4>;
#declare Camera_Lookat   = <10,-10,10>;

light_source {< 0, 0,  100> color rgb<1,1,1>}


camera {                  perspective
  location Camera_Location
  look_at    Camera_Lookat
  direction z
  angle 20
}

// ----------------------------------------
         union {
  sphere {0,1}
  sphere {<-2,0,-2>,1}
  sphere {< 5,0, 5>,1}
  sphere {<10,0,10>,1}
  box {-10,10}}

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