WYSIWYG NPR: drawing strokes directly on 3D models
A screen-space formulation for 2D and 3D direct manipulation
Proceedings of the 22nd annual ACM symposium on User interface software and technology - UIST ’09
ACM Transactions on Graphics
Jason L. Reisman
Jefferson Y. Han
John F. Hughes
Matthew Webb
Adam Finkelstein
Joseph C. Lee
Overcoming Limitations of the Trackpad for 3D Docking Operations
Authoring and Animating Painterly Characters