**An Interface for Sketching 3D Curves****Author(s): **Jonathan M. Cohen, Lee Markosian, Robert C. Zeleznik, John F. Hughes, Ronen Barzel.**Proceedings: **Proceedings of the 1999 ACM Symposium on Interactive 3D Graphics, pp. 17--21,
1999.

[BibTeX]

**Abstract: **

The ability to specify nonplanar 3D curves is of fundamental importance in 3D modeling and animation systems. Effective techniques for specifying such curves using 2D input devices are desirable, but existing methods typically require the user to edit the curve from several viewpoints. We present a novel method for specifying 3D curves with 2D input from a single viewpoint. The user first draws the curve as it appears from the current viewpoint, and then draws its shadow on the floor plane. The system correlates the curve with its shadow to compute the curve's 3D shape. This method is more "natural" than existing methods in that it leverages skills that many artists and designers have developed from work with pencil and paper.

**Harold: A World Made of Drawings**

Jonathan M. Cohen, John F. Hughes, Robert C. Zeleznik.

1st International Symposium on Non-Photorealistic Animation and Rendering (NPAR'00), pp. 83--90, Annecy, France, June 05 - 07,
2000. [BibTeX]

**SKETCH: An Interface for Sketching 3D Scenes**

Robert C. Zeleznik, Kenneth P. Herndon, John F. Hughes.

Proceedings of SIGGRAPH '96, August,
1996. [BibTeX]

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