NDLI: Function-Based Haptic Interaction in Cyberworlds

Content Provider	IEEE Xplore Digital Library
Author	Lei Wei Sourin, A.
Copyright Year	2011
Abstract	Polygon and point based models dominate in virtual reality. These models also affect haptic rendering algorithms which are often based on collision with polygons. We use mathematical functions to define and implement geometry (curves, surfaces and solid objects), visual appearance (3D colors and geometric textures) and various tangible physical properties (elasticity, friction, viscosity, and force fields). The function definitions are given as analytical formulas (explicit, implicit and parametric), function scripts and procedures. Since the defining functions are very small we can efficiently use them in collaborative virtual environments to exchange between the participating clients. We proposed an algorithm for haptic rendering of virtual scenes including mutually penetrating objects with different sizes and arbitrary location of the observer without a prior knowledge of the scene to be rendered. The algorithm is based on casting multiple haptic rendering rays from the Haptic Interaction Point (HIP), and it builds a stack to keep track on all colliding objects with the HIP. The algorithm uses collision detection based on implicit function representation of the object surfaces. The proposed approach allows us to be flexible when choosing the actual rendering platform. The function-defined objects and parts constituting them can be used together with other common definitions of virtual objects such as polygon meshes, point sets, voxel volumes, etc. We implemented an extension of X3D and VRML which allows for defining complex geometry, appearance and haptic effects in virtual scenes by functions and common polygon-based models, with various object sizes, mutual penetrations, arbitrary location of the observer and variable precision.
Starting Page	217
Ending Page	221
File Size	330125
Page Count	5
File Format	PDF
ISBN	9781457714535
DOI	10.1109/CW.2011.19
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-10-04
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Haptic interfaces Rendering (computer graphics) Hip Force Visualization Containers Solid modeling shared virtual spaces haptic implicit functions
Content Type	Text
Resource Type	Article

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