The formula I used is the way that PoV combines blob components.

The maxs limit the effect of each component so they don't add negative
potential outside their nominal 'surface' (ie where the potential is
zero).

The '0.1 - ( ... )' sets the threshold, 0.1 in this case, and you can
multiply each individual component by a value to set its strength, all 1
in the example.

	Hope this helps,
		Mike Andrews.

TonyB wrote:
> 
> What the hell did you do here? How did you come up with all those max, etc.
> etc. formulas?

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