One of the most difficult parts of creating the film was making Donkey's fur flow smoothly so that it didn't look like a Chia Pet's fur. This fell into the hands of the surfacing animators who used flow controls within a complex shader to provide the fur with many attributes (ability to change directions, lie flat, swirl, etc.) It was then the job of the visual effects group, led by Ken Bielenberg, to make the fur react to environment conditions. Once the technology was mastered, it was able to be applied to many aspects of the Shrek movie including grass, moss, beards, eyebrows, and even threads on Shrek's tunic. Making human hair realistic was different from Donkey's fur, requiring a separate rendering system and a lot of attention from the lighting and visual effects teams.

Film

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