if you use that
#declare T_Electron =
  pigment {
    crackle
    pigment_map {
        [0.00   Clear]
        [1.00  Clear ]
    }
  };

the problem goes away ...


hence it seems that the texture_map which creates your problem ...




web.46e05e106d67f0f14e9a00c00@news.povray.org...
> The code below generates five spheres which should be invisible, yet three
> of them are visible from their interaction with the environment.  The
> spheres become visible when you apply a rotation to a texture that uses a
> texture_map  containing clear (rgbt <1,1,1,1>) components as in the
> T_Electron texture below.  If the texture is not rotated, then the sphere
> remains invisible.  Rotation applied to a clear texture not part of a
> texture_map also remains invisible.
>
> It also seems to be the case that the surface behind the spheres must have
a
> "normal" for the effect to occur.  The effect goes away if you remove the
> "normal" block in the texture of the  "floor".
>
> I realize the T_Electron texture as written below is pretty pointless, but
> in the actual scene I am trying to create, not all of the texture map is
> clear. The intent was to create a spherical shell of lightning with parts
> of the texture_map representing the lightning, and the rest clear.  The
> problem I am having is the the clear portions affecting the appearance of
> objects behind it.  I removed the "lightning" portion for this example.
>
> I am using povray 3.6
>
> #include "colors.inc"
>
> #declare T_Clear = texture {pigment { Clear }}
>
> #declare T_Electron =
>   texture {
>     crackle
>     texture_map {
>         [0.00   T_Clear]
>         [1.00   T_Clear]
>     }
>   }
>
> //
> // Three of these spheres are visible (those at x positions -1,
> // 0 and 1).
> //
> sphere { <-1,1,0>,   0.2 hollow texture { T_Electron rotate 90*y }}
> sphere { <-0.5,1,0>, 0.2 hollow texture { T_Electron rotate 0*y }}
> sphere { <0,1,0>,    0.2 hollow texture { T_Electron rotate 90*y }}
> sphere { <0.5,1,0>,  0.2 hollow texture { T_Clear rotate 90*y }}
> sphere { <1,1,0>,    0.2 hollow texture { T_Electron rotate 90*y }}
>
>
> plane { y, 0
>   texture {
>     pigment {
>       checker
>       Red
>       White
>       scale 0.05
>     }
>     normal { bozo 4}
>   }
> }
>
> light_source {
>   <-8.0,   6,   -10>
>   color rgb 2
> }
>
> camera {
>   //
>   // New Main view
>   //
>   look_at <0,1,0>
>   location <0,1.5,-2>
>
>   up <0,1,0>
> }
>
>
>
>
>

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