Am 12.05.2011 22:25, schrieb TawnyOwl:
> 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.

For determining the "slope" of the blade, retrieving the normal vector 
from a single trace() call should suffice.

Tracing multiple rays is a good idea though to prevent drops from 
hanging out too far at a blade edge.

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