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A Projective Drawing System
Author(s): Osama Tolba, Julie Dorsey, Leonard McMillan.
Proceedings: 2001 ACM Symposium on Interactive 3D Graphics,
2001.
[BibTeX] 
Abstract:
We present a novel drawing system for composing and rendering
perspective scenes. Our approach uses a projective 2D representation
for primitives rather than a conventional 3D description. This
allows drawings to be composed with the same ease as traditional illustrations,
while providing many of the advantages of a 3D model.
We describe a range of user-interface tools and interaction techniques
that give our system its 3D-like capabilities. We provide
vanishing point guides and perspective grids to aid in drawing freehand
strokes and composing perspective scenes. Our system also
has tools for intuitive navigation of a virtual camera, as well as
methods for manipulating drawn primitives so that they appear to
undergo 3D translations and rotations. We also support automatic
shading of primitives using either realistic or non-photorealistic
styles. Our system supports drawing and shading of extrusion surfaces
with automatic hidden surface removal and highlighted silhouettes.
Casting shadows from an infinite light source is also possible
with minimal user intervention.
Decoupling Strokes and High-Level Attributes for Interactive Traditional Drawing
Frédo Durand, Victor Ostromoukhov, Matthew Miller, Francois Duranleau, Julie Dorsey.
Eurographics Workshop on Rendering 2001,
2001. [BibTeX]
Sketching with Projective 2D Strokes
Osama Tolba, Julie Dorsey, Leonard McMillan.
UIST '99,
1999. [BibTeX]