> Second thought: 4 points are one to much. Better use only 3 in a
> equiliteral traingle at the borders of the drops. Then the plane
> between this points on the blade is well defined (4 points may not
> result in a plane) and the slopes can be calculated.

   I was going to go for the 4 points approach, until you made this
useful suggestion... thanks! For the slope, as clipcka said, the normal
returned by the first trace() is enough to reorient the drop (and I was
already using it, even if it's not very noticeable because the drops are
too spherical).


-- 
Jaime Vives Piqueres
		
La Persistencia de la Ignorancia
http://www.ignorancia.org

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