Directability is the ability of a director to exert control over a process which is used to generate an image or shape. Or, said more clearly, directability is artistic control. CG natural phenomena for use in CG film should be directable.
We added some directability to our weathering simulation by allowing the director to edit a curve (really a sequence of line segments) which specify the durability of the rock. The weathered rock takes on the profile of the durability curve.
The resulting process is a lot like the use of curves in specifying plant shapes as found in a paper by Prusinkiewicz called "The use of positional information in the modeling of plants" It's an interesting paper and their images are pretty amazing.
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