The code below shows 2 potential bugs affecting transparency.
These have been observed on 3.1 (using material_map) and 3.5, at least on a
Windows version, running XP.
The first bug makes the transparent part visible. It's apparently linked
with fog turbulence.
The second bug makes the normals behind look weird when the transparency
texture is scaled very unevenly (pure 100% transparent texture is not
affected).

Can other people confirm that these problems exist and that they are really
bugs (they were reported by a Moray/POV-Ray 3.1 user)?


camera {location  -z*35}
light_source {(x+y-z)*50 rgb 1}

fog {
  fog_type   1
  distance   30
  color      rgb 1
// turbulence makes the transparent part visible
  turbulence 0.8
}
sphere{0,8 pigment{rgb x+y} normal{bumps 1}}
union{
    triangle{-x,-x+y,x+y}
    triangle{-x,x,x+y}
    hollow
    texture{
        pigment_pattern{
            bozo color_map{[0.4 rgb 1][0.4 rgb 0]}
        }
        texture_map{
            [0.5 pigment{rgb x} finish{ambient 0 diffuse 1}]
            [0.5 pigment{rgbt 1} finish{ambient 0 diffuse 0}]
        }
// uneven scaling makes the normals behind look weird
        scale <1,1,0.001>
    }
    scale 2
    translate -z*20

}


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