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We present a comprehensive 3D sketch recognition framework for interaction within Virtual Environments that allows to trigger commands by drawing symbols, which are recognized by a multi-level analysis. It proceeds in three steps: The segmentation partitions each input line into meaningful segments, which are then recognized as a primitive shape, and finally analyzed as a whole sketch by a symbol matching step. The whole framework is configurable over well-defined interfaces, utilizing a fuzzy logic algorithm for primitive shape learning and a textual description language to define compound symbols. It allows an individualized interaction approach that can be used without much training and provides a good balance between abstraction and intuition. We show the real-time applicability of our approach by performance measurements.

This paper presents a sketch-based interface for interactive modification of architectural design prototypes inside a virtual environment. The user can move around in the scenery and create line drawings to add annotations. In order to modify or extend the scenery, she can sketch command symbols, which are then recognized by the application to trigger the application defined commands. This allows the user to modify existing objects in the scene as well as to create new ones. This sketch based interface is supposed to act as a front-end application for architects in order to have a tool for the interactive reconfiguration of rooms and interior in a visual-acoustic virtual environment.