"Mike Miller" <mil### [at] gmailcom> wrote:
>
> I found the problem. It turns out that if add even a small amount of turbulence
> (.3 or more) to the fog definition - it tints the alpha portion of the image
> map. I set the turbulence to zero and it cleared it up. I'm not sure why, but it
> worked.

Yeah, that's a strange problem; I'm glad you found a solution.

> #declare sprite = box {<-.5,0,-.01>,<.5,1,.01> } ;
> object { sprite material {M_grass_A} scale <30,40,1> translate <0,-1,0>}

Just thought I would mention that you can make a box object with zero thickness,
which might be better for billboards. I usually use that trick.

#declare sprite = box {<-.5,0,0>,<.5,1,0> };

I wonder if that would have any effect on your original problem.

--------
A box can't be *scaled* to have zero-thickness, but it can be made that way
initially.

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