A 3D curve sketching system
that captures some of the affordances of pen and paper for professional
designers, allowing them to iterate directly on concept 3D curve models. The
system coherently integrates existing techniques of sketch-based interaction
with a number of novel and enhanced features. Novel contributions of the system
include automatic view rotation to improve curve sketchability, an axis widget
for sketch surface selection, and implicitly inferred changes between sketching
techniques. We also improve on a number of existing ideas such as a virtual
sketchbook, simplified 2D and 3D view navigation, multi-stroke NURBS curve
creation, and a cohesive gesture vocabulary.
clipped from: www.dgp.toronto.edu 