We describe a novel approach to inferring 3D curves from perspective drawings in an interactive design tool. Our methods are based on a traditional design drawing style known as Analytic drawing, which supports precise image-space construction of a linear 3D scaffold. This scaffold in turn acts as a set of visual constraints for sketching 3D curves. We implement analytic drawing techniques in a pure-inference sketching interface which supports both single and multi-view incremental construction of complex scaffolds and curve networks. A new representation of 3D drawings is proposed, and useful interactive drawing aids are described. Novel techniques are presented for deriving constraints from single-view sketches drawn relative to the current 3D scaffold, and then inferring 3D line and curve geometry which satisfies these constraints. The resulting analytic drawing tool allows 3D drawings to be constructed using exactly the same strokes as one would make on paper.
author = "Ryan Schmidt and Azam Khan and Karan Singh and Gord Kurtenbach",
title = "Analytic Drawing of 3D Scaffolds",
journal = "ACM Transactions on Graphics",
volume = 28,
number = 5,
year = 2009,
note = "Proceedings of SIGGRAPH ASIA 2009",
Designing user interfaces for interacting with 3D data involves a number of factors that are not found in traditional 2D interfaces. In this project, we explore subtle yet critical aspects of 3D control and feedback. A number of research outcomes have been integrated into several Autodesk products and we continue to explore this complex area.