Harold: A World Made of Drawings
Author(s): Jonathan M. Cohen, John F. Hughes, Robert C. Zeleznik.
Proceedings: 1st International Symposium on Non-Photorealistic Animation and Rendering (NPAR'00), pp. 83--90, Annecy, France, June 05 - 07,
2000.
[BibTeX] 
Abstract:
The problem of interactively creating 3D scenes from 2D input is a
compelling one, and recent progress has been exciting. We present
our system, Harold,which combines ideas from existing techniques
and introduces new concepts to make an interactive system for creating
3D worlds. The interface paradigm in Harold is drawing: all
objects are created simply by drawing them with a 2D input device.
Most of the 3D objects in Harold are collections of planar
strokes that are reoriented in a view-dependent way as the camera
moves through the world. Virtual worlds created in Harold are
rendered with a stroke-based system so that a world will maintain
a hand-drawn appearance as the user navigates through it. Harold
is not suitable for representing certain classes of 3D objects, especially
geometrically regular or extremely asymmetric objects.However,
Harold supports a large enough class of objects that a user can
rapidly create expressive and visually rich 3D worlds.