Efficient simulation and rendering of realistic motion of one-dimensional flexible objects

Menon, Midhun S and Gurumoorthy, B and Ghosal, Ashitava (2016) Efficient simulation and rendering of realistic motion of one-dimensional flexible objects. In: COMPUTER-AIDED DESIGN, 75-76 . pp. 13-26.

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Abstract

In gross motion of flexible one-dimensional (1D) objects such as cables, ropes, chains, ribbons and hair, the assumption of constant length is realistic and reasonable. The motion of the object also appears more natural if the motion or disturbance given at one end attenuates along the length of the object. In an earlier work, variational calculus was used to derive natural and length-preserving transformation of planar and spatial curves and implemented for flexible 1D objects discretized with a large number of straight segments. This paper proposes a novel idea to reduce computational effort and enable real-time and realistic simulation of the motion of flexible 1D objects. The key idea is to represent the flexible 1D object as a spline and move the underlying control polygon with much smaller number of segments. To preserve the length of the curve to within a prescribed tolerance as the control polygon is moved, the control polygon is adaptively modified by subdivision and merging. New theoretical results relating the length of the curve and the angle between the adjacent segments of the control polygon are derived for quadratic and cubic splines. Depending on the prescribed tolerance on length error, the theoretical results are used to obtain threshold angles for subdivision and merging. Simulation results for arbitrarily chosen planar and spatial curves whose one end is subjected to generic input motions are provided to illustrate the approach. (C) 2016 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	COMPUTER-AIDED DESIGN
Publisher:	ELSEVIER SCI LTD
Additional Information:	Copy right for this article belongs to the ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
Keywords:	One-dimensional flexible body; Natural motion; Control polygon; Approximate length preservation; Subdivision; Merging
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	12 May 2016 07:05
Last Modified:	12 May 2016 07:05
URI:	http://eprints.iisc.ac.in/id/eprint/53801

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