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Modelling a Feather as a Strongly Anisotropic Elastic Shell
Jean Jouve, Victor Romero, Rahul Narain, Laurence Boissieux, Theodore Kim, Florence Bertails-Descoubes
Feathers behave in a highly anisotropic way governed by their hierarchical microstructure of barbs clamped onto a rachis and linked by tiny barbules, which prior cloth-strip approximations f
Abstract
Feathers behave in a highly anisotropic way governed by their hierarchical microstructure of barbs clamped onto a rachis and linked by tiny barbules, which prior cloth-strip approximations fail to capture. Using measurement protocols on real feather samples, the authors find a linear orientation-dependent strain-stress relationship and an extreme ratio of stiffnesses between the barb and barbule directions, leading to a three-parameter anisotropic elastic shell model. They overcome the resulting numerical locking and ill-conditioning by aligning the mesh with barb directions and replacing the stiffest modes with an inextensibility constraint, then add anisotropic bending and demonstrate full-feather and bird-scale scenarios.
How to read this
- Category
- Method: an anisotropic elastic shell model for feathers
- Contributions
- A measurement-derived three-parameter anisotropic elastic shell model capturing feather barb/barbule stiffness
- Numerical treatment that aligns the mesh with barb directions and replaces the stiffest modes with an inextensibility constraint to avoid locking
- Anisotropic bending plus full-feather and bird-scale demonstrations
- Context
- Grounded in thin-shell elasticity for graphics (e.g. Grinspun et al.'s Discrete Shells), specializing it to the strongly anisotropic microstructure of feathers that cloth-strip approximations miss.Builds on: Discrete Shells
- Correctness
- The linear orientation-dependent strain-stress assumption comes from measurements on real samples; validity is tied to those samples and the stated stiffness regime, and the locking/ill-conditioning fixes are necessary precisely because the anisotropy is extreme.
- Clarity
- Clearly motivated physically; a first pass conveys the anisotropy story, a second pass for the shell formulation and the numerical conditioning fixes.
- How to read it
- Read the measurement findings and the three-parameter model first; a second pass is worth it for the mesh alignment, inextensibility constraint, and anisotropic bending.
Builds on
- Discrete Shells 2003
Built upon by
Nothing yet.
Related work
- Biological Modeling of Feathers by Morphogenesis Simulation 2020 / Cyberworlds
- A Biologically-Parameterized Feather Model 2002 / Eurographics
- Animating Puss in Boots' Feather in Shrek 2 2004 / SIGGRAPH
- Procedurally Generating Biologically Driven Feathers 2019 / CGI
Keywords
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