Feel the inside: A haptic interface for navigating stress distribution inside objects
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ORIGINAL ARTICLE
Feel the inside: A haptic interface for navigating stress distribution inside objects Lifeng Zhu1,2
· Rubin Ren1 · Dapeng Chen1,2 · Aiguo Song1,2 · Jia Liu2 · Ning Ye3 · Yin Yang4
© Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Understanding stress distributions over 3D models is a highly desired feature in many scientific and engineering fields. The stress is mathematically a second-order tensor, and it is typically visualized using either color maps, tensor glyphs, or streamlines. However, neither of these methods is physically intuitive to the end user, and they become even more awkward when dealing with the volumetric tensor field over a complicated 3D shape. In this paper, we present a virtual perception system, which leverages a multi-finger haptic interface to help users intuitively perceive 3D stress fields. Our system allows the user to navigate the interior of the 3D model freely and maps the stress tensor to the haptic rendering along the direction of the finger’s trajectory. Doing so provides user a natural and straightforward understanding of the stress distribution without interacting with the parameters in the mapped visual representations. Experimental results show that our system is preferred in navigating stress fields inside an object and is applicable for different design tasks. Keywords Haptics · User interface · Stress field
1 Introduction Stress is a physics quantity in continuum mechanics, which expresses the internal forces that neighboring particles of a continuous material exert on each other. Stress field of an object varies with its deformation under specified loads or constraints. The material is prone to fail at the places where the stress is higher. Therefore, it is a key index in structural analysis with various applications in material and shape modeling in industrial design [18], strength analysis Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00371-020-01891-9) contains supplementary material, which is available to authorized users.
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Lifeng Zhu [email protected]
1
The State Key Laboratory of Bioelectronics, Jiangsu Key Lab of Remote Measurement and Control, School of Instrument Science and Engineering, Southeast University, Nanjing, China
2
CICAEET, Nanjing University of Information Science and Technology, Nanjing, China
3
School of Information Technology, Nanjing Forestry University, Nanjing, China
4
School of Computing, Clemson University, Clemson, USA
in architecture and geology [35], or even surgical planning in medicine [6,34]. Being a three-dimensional (3D) tensor field in nature, stress field is not straightforward to be visualized with existing virtual design systems. As a compromise, designers usually compute the von Mises stress or the maximum principal stress from the stress tensor and then display them as color-coded scalar fields. This substitution is not intuitive for the user to perceive the stress. First, volumetric data visualization techniques are still requir
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