Blue Pencil is a plugin for Maya that brings advanced 2D drawing to the 3D viewport. With support for layers, transformations, auto-keying and more, Blue Pencil is a multi-purpose tool that is useful for, but not limited to:
Grease Pencil - planning, annotation and illustration
Animation - thumbnails, rough blocking and arc tracking
Model layout and topology planning
Shot review tool
Tutorials and screencasting
