Here is a pretty simple system about camera...
The idea is to get a camera which is rotating
around the Y axis,  as easily as into any other
3D package.

//______________________________________________
//______________________________________________

#declare flying_cam = // or call it cam_2001 as well !! //
camera {
  location < 0, 0, -1 >
  look_at 0.0*y  // can be set from -0.25 to 0.25... almost //
  angle 48
  rotate 0*x  // can be set at any degree...  180 degrees gives you a
back view !! //
  rotate 0*y  // can be set at any degree //
}

camera { flying_cam translate < 0, 0, -30 > rotate < 30, -30, 0 > } //
one setting among any //  others // this cam gives you a powerfull way
of exploring a given 3D space...
// ... Usefull method to explore "H_F",  for example. //

//_______________________________  E N D ___________________________ //

 //  ALEX PILOTE      QUEBEC     CANADA //

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