/*Bug description

When translating any Primitive, this results in some version
of the vanish/ghost/kill-everything bug.

Though with this setup I only get "vanish" or "kill all", I still think
it all relates to this:
Normalizing the "Origin-Vector" (<0,0,0>) with POV-SDL vnormalize(),
you'll get buggy results. It doesn't matter if you #declare that calculation
(as used below with "Test"), or use it directly.

*/
//Following switch uses mesh-directive, if set to "no", mesh will be replaced with union
#declare Use_Mesh=yes;

//I assume this only does gamma-correction and doesn't affect actual scene-calculation
global_settings{assumed_gamma 1}

//Sky-sphere just to show that background-and sky-sphere aren't affected
sky_sphere{pigment{gradient y color_map{[0 rgb .5][1 rgb z*.2]}scale 2 translate -1}}

//Just switch Focal_Blur on/off to see and check the difference...
#declare Focal_Blur=on;

camera{location <0,5,-26> look_at <0,-5,0>
 #if (Focal_Blur)
  focal_point <0,0,0> aperture .65 blur_samples 40
 #end
}

light_source{<0,10,0> rgb 1}

disc{y*-15,y,7 pigment{rgb 1}}
sphere{y*-12,3 pigment{rgb 1}}

#declare Test=vnormalize(<0,0,0>); //Makes no change if commented or not

 #if (Use_Mesh)
 mesh{
 #else
 union{ 
 #end

  triangle{ <-2,0,0><2,0,0><0, 2,-1>}
  triangle{ <-2,0,0><2,0,0><0,-2, 1>}

//Wiping out all objects in scene
//plane{y,0
//sphere{0,1
//box{-1,1

//Just vanish
//A union

//Just vanish and "cut" the scene
//cone{0,1,y,0
//A mesh

  pigment{rgb x transmit .6}

  //Experimental Line: Try commenting in and out
  translate Test //vnormalize(<0,0,0>)
  }