Kenneth wrote:

> the documentation isn't completely clear about how the map's index values treat
> an image_map. 

there is no special treatement for image_maps. If the value
you put before the image_map entry is V, and the boxed pattern
at a certain point in space evaluates to x (0<=x<=1), then the
resulting pigment is:

  x ==  0  ==> Fully transparent
  x >=  V  ==> Pigment as specified at V (last entry in map)
0 < x < V ==> Resulting pigment is weighted average of
               fully tansparent and specified pigment
               depending on how close x is to 0 or V.

E.g. if x = 0.5*V you will get 50% transparency. For your
decal you don't want fading from the center so you need a very
small value for V.

> Note the horizontal wing, and how the image is barely visible on
> it--I scaled the box very thin to get that.

if possible, it will of course be preferrable to apply the
texture to the target object *before* adding extra geometry,
so it will not be visible at all on the horizontal part.
But I assume this was just for demonstration ;)

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