How to Rig eyes for dilation in Blender

In this Blender 2.5 video tutorial, you'll see how to use driven shape-keys to dilate the pupil of an eye. The tutorial also demonstrates how to use custom bone shapes and limiting the transformation of a bone via constraints. Whether you're new to the Blender Foundation's popular open-source 3D computer graphics application or are a seasoned digital artist merely on the lookout for new tips and tricks, you're sure to be well served by this free video software tutorial from the folks at CG Cookie. For more information, including step-by-step instructions, take a look!