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Vol. 49 (2008) No. 1 April n. 157


Generation of Nature Inspired Novel Folded Surface Forms Using Modified Structured Lighting Method and CAD Based Procedures

< Table of Contents for Vol. 49 (2008) No. 1 April n. 157
  • Journal Name: Journal of the International Association for Shell and Spatial Structures (J. IASS)
  • ISSN: (Electronic Version) 1996-9015
  • ISSN: (Print Version) 1028-365X
  • Issue: Vol. 49 (2008) No. 1 April n. 157
  • Pages: 57-72
  • Title: Generation of Nature Inspired Novel Folded Surface Forms Using Modified Structured Lighting Method and CAD Based Procedures
  • Author(s): S.A. Razzack, K.K. Choong and M.M. Ratnam
  • Keywords: Johannesteijsmannia altifrons, Curved unidirectionally and bidirectionally folded surface
Abstract
Mimicking shell surfaces in nature for possible engineering applications requires 3D modeling of the object under consideration. The random features of surfaces in nature render them difficult to model using mathematical equations or the principles of rotation and translation. In such cases, non-contact means such as structured lighting method offers a good low cost alternative particularly for flexible objects such as plant leaves. However, accuracy of measurement using structured lighting method is affected when the object is large in size due to parallax effect. In this paper, a modified approach based on structured lighting method to treat parallax distortion in images is presented where the actual experimental setups with varying projection angles are considered. The algorithm is first evaluated through measuring three solid objects with different folded surface profiles. It is then applied to capture the surface data of the leaf of J. altifrons. The method yielded significantly representative models to be used as input data for further structural analysis. Apart from that, the paper also illustrates the application of CAD based procedures namely Rigid Geometry Approach (RGA) and Natural Geometry Approach (NGA) to generate new doubly curved surfaces with folds.

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