An introduction to solid modeling
An introduction to solid modeling
Sweep surfaces modelling via coordinate transformations and blending
Computer-Aided Design
Communications of the ACM
Visual Interpretation of Hand Gestures for Human-Computer Interaction: A Review
IEEE Transactions on Pattern Analysis and Machine Intelligence
Surface drawing: creating organic 3D shapes with the hand and tangible tools
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Mathematical Elements for Computer Graphics
Mathematical Elements for Computer Graphics
Modeling generalized cylinders using direction map representation
Computer-Aided Design
Virtual reality for assembly methods prototyping: a review
Virtual Reality - Special issue on Virtual Manufacturing and Construction
Data miming: inferring spatial object descriptions from human gesture
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Brave NUI World: Designing Natural User Interfaces for Touch and Gesture
Brave NUI World: Designing Natural User Interfaces for Touch and Gesture
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We present a novel interaction system, ''Shape-It-Up'', for creative expression of 3D shapes through the naturalistic integration of human hand gestures with a modeling scheme dubbed intelligent generalized cylinders (IGC). To achieve this naturalistic integration, we propose a novel paradigm of shape-gesture-context interplay (SGCI) wherein the interpretation of gestures in the spatial context of a 3D shape directly deduces the designer's intent and the subsequent modeling operations. Our key contributions towards SGCI are threefold. Firstly, we introduce a novel representation (IGC) of generalized cylinders as a function of the spatial hand gestures (postures and motion) during the creation process. This representation allows for fast creation of shapes while retaining their aesthetic features like symmetry and smoothness. Secondly, we define the spatial contexts of IGCs as proximity functions of their representational components, namely cross-sections and the skeleton with respect to the hands. Finally, we define a natural association of modification and manipulation of the IGCs by combining the hand gestures with the spatial context. Using SGCI, we implement intuitive hand-driven shape modifications through skeletal bending, sectional deformation and sectional scaling schemes. The implemented prototype involves human skeletal tracking and hand posture classification using the depth data provided by a low-cost depth sensing camera (Kinect(TM)). With Shape-It-Up, our goal is to make the designer an integral part of the shape modeling process during early design, in contrast to the case for current CAD tools which segregate 3D sweep geometries into procedural 2D inputs in a non-intuitive and onerous process requiring extensive training. We conclusively demonstrate the modeling of a wide variety of 3D shapes within a few seconds.