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Rendering Iridescent Rock Dove Neck Feathers
Weizhen Huang, Sebastian Merzbach, Clara Callenberg, Doekele Stavenga, Matthias B. Hullin
Bird feathers exhibit fascinating reflectance governed by fiber-like structures whose hierarchical patterns span many orders of magnitude in scale, with non-cylindrical fiber cross-sections
Abstract
Bird feathers exhibit fascinating reflectance governed by fiber-like structures whose hierarchical patterns span many orders of magnitude in scale, with non-cylindrical fiber cross-sections and regular nanostructures that produce rich structural color. This work introduces a feather modeling and rendering framework that abstracts the microscopic geometry and reflectance into a microfacet-like BSDF requiring no precomputation or storage and supporting efficient importance sampling. The model is validated against a BSDF-capturing setup for small biological structures and calibrated photographs of rock dove neck feathers.
How to read this
- Category
- Method: appearance model for iridescent feathers
- Contributions
- A feather modeling and rendering framework that abstracts hierarchical fiber geometry and structural color into a microfacet-like BSDF
- A model requiring no precomputation or storage and supporting efficient importance sampling
- Validation against a BSDF-capturing setup for small biological structures and calibrated photographs of rock dove neck feathers
- Context
- Extends microfacet and structural-color theory, in the lineage of practical iridescence models such as Belcour and Barla (2017), to non-cylindrical feather fibers with nanostructures.Builds on: A Practical Extension to Microfacet Theory for the Modeling of Varying Iridescence
- Correctness
- Validated against captured BSDF measurements and calibrated photographs of rock dove neck feathers, so it is grounded in real data for that species; generalization to other feather types and scales is an abstraction of the underlying micro-geometry rather than a full first-principles simulation.
- Clarity
- Specialized; a first pass conveys the BSDF abstraction goal, a second pass is needed for the microfacet derivation and sampling.
- How to read it
- Focus first on how multi-scale fiber structure is collapsed into a sampleable BSDF; do a second pass on the importance-sampling and validation if you are implementing the shader.
Built upon by
Related work
- A Surface-based Appearance Model for Pennaceous Feathers 2024 / CGF
- Appearance Modeling of Iridescent Feathers with Diverse Nanostructures 2024 / SIGGRAPH Asia
- A Practical Extension to Microfacet Theory for the Modeling of Varying Iridescence 2017 / TOG
- Modeling and Rendering of Realistic Feathers 2002 / SIGGRAPH
Keywords
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