Mike Williams <nos### [at] econymdemoncouk> wrote:
> One thing you could try is to use a texture_map to take the weighted
> average of your existing texture and a completely transmitting texture.
> As you change the weights used in the average, the transmittance of the
> overall object should vary.

Thanks Mike.

Your suggestion works.

Unfortunately, it's painfully slow and it takes close to 20 seconds per
scanline for a relatively small image -- 640 x 400.  At the resolution at
which I need to render, I have the feeling that it would be prohibitive for
animation of any length.  This is on a reasonably fast Linux box.

Anyhow, I learned a new trick, so that's a good thing.

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