An interface for sketching 3D curves
I3D '99 Proceedings of the 1999 symposium on Interactive 3D graphics
Teddy: a sketching interface for 3D freeform design
Proceedings of the 26th annual conference on Computer graphics and interactive techniques
Creating principal 3D curves with digital tape drawing
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Virtual sculpting with a pressure sensitive pen
ACM SIGGRAPH 2003 Sketches & Applications
ILoveSketch: as-natural-as-possible sketching system for creating 3d curve models
Proceedings of the 21st annual ACM symposium on User interface software and technology
Technical Section: Sketch-based modeling: A survey
Computers and Graphics
A survey of sketch-based 3-D modeling techniques
Interacting with Computers
On expert performance in 3D curve-drawing tasks
Proceedings of the 6th Eurographics Symposium on Sketch-Based Interfaces and Modeling
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3D curve drawing is a fundamental operation in the creation and manipulation of surfaces and 3D models. Although techniques for specifying 3D curves using 2D input devices have been developed extensively, they are mostly indirect, with the need of multiple viewpoints or multiple lines to specify a 3D curve. We propose a simple technique to directly specify a 3D curve - using pen pressure to draw a single line of varying thickness, and mapping the thickness at each point along the curve to a depth distance. Hence, the thicker the 2D curve at a particular point, the closer the corresponding 3D point to the camera. This method is easy and intuitive, and yet surprisingly it has not been reported before. We illustrate the effectiveness of the method with numerous examples.