Why don't you try using a color map? Something like
density{
function{ ... }
color_map{
[0 rgb 0]
[0.5 rgb 0]
[1.0 rgb 1]
}
}
This should clamp the values of density to 0 (i.e. transparent) unless
function is > 0.5. Is that what you're going for?
In Him,
Ben
