Okay thanks. but what worked was making a GIF and then:

    box{<0,0,-0.0001>,<1,1,-0.0002>
       texture{
                pigment{ image_map {gif "w_mygif_gri.gif"
                                //filter all 0.9999
                                transmit all 0.9900625
                                map_type 0 once }
                        }
               finish{diffuse 0 ambient 1}
               }
        scale 45*<320/400,1,1>
          no_shadow
        translate -39*z-23*x+51*y}

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