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Been fooling around with glows and ran across an interesting
property... negative colors can be used to cancel or shape the
halo.
I have included a trivial example where a negative green glow
cancels a positive one. This action is actually color-specific so
you can selectively allow different frequencies to pass or not
as required.
Not very exciting news perhaps, but it might be useful...
-------------------------------- snip --------------------------------
sphere { < 0, 0, -2000 > 1 pigment { rgb < 1, 1, 1 > } }
camera { location < 0, 0, -10 > look_at < 0, 0, 0 > }
/* positive */
glow
{
0.5
glow_type 0
color vnormalize( < 0, 1, 0 > )
location < -1, 0, 0 >
}
/* negative */
glow
{
0.5
glow_type 0
color vnormalize( < 0, -1, 0 > )
location < 1, 0, 0 >
}
-------------------------------- snip --------------------------------
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