Help!

In my current POVray work, I'm incorporating a lightning bolt - to do this
I'm using a GIF image textured onto a very thin box primitive, and using
'transmit' to filter out the various shades..the trouble is, the colours
that need to be completely transparent, just...well...aren't.

What happens is that I get my bright lightning bolt, fair enough...but the
part that needs to be completely transparent just looks a little darker.

I've tried pretty much everything to eliminate this problem, as you can see
from the snippet below:

#declare lightning1 = box {<0,0,0>, <2,-5,0.0001> texture {pigment
{image_map {gif "lightning1.gif" transmit 0, 0.1 transmit 1, 0.5 transmit
2,0.6 transmit 3,0.7 transmit 4,0.8 transmit 5,0.9 transmit 6,0.95 transmit
7,1.0 transmit 8,1.0 transmit 9,1.0 transmit 10, 1.0 transmit 11, 1.0
transmit 12, 1.0 transmit 13, 1.0  transmit 14, 1.0  transmit 15, 1.0
interpolate 4} scale 2.25 scale y*1.25}} interior {fade_power 0
fade_distance 0} finish {ambient 1.0  diffuse 0} hollow no_shadow}

Any help will be very much appreciated - this is making me lose a lot of
hair!!!!!!!

BTW - is there any way to compact/refine this particular piece of script?
Looks kind of ugly to me.

Tony S

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