I have a bit map image , http://www.cosy.com/cosycube.gif , where I've made
the background transparent ,

  #declare CCube = object { box { < 0, 0 , -.2 > , < 1 , 1 , .2 >
                             pigment { image_map { png "CoSyCubeFULL.png"
                                                   transmit 2 , 1.0 } }  }

but it appears the figure is projected only on the front and back of planes
of the box . How do I make it solid thru the thickness of the box which is
what I expected by default ?

Thanks .

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