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Modeling and Rendering of Realistic Feathers

Yanyun Chen, Ying-Qing Xu, Baining Guo, Heung-Yeung Shum

SIGGRAPH4 descendantsCFX

This paper presents techniques for modeling and rendering realistic feathers and feathered birds.

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Abstract

This paper presents techniques for modeling and rendering realistic feathers and feathered birds. A feather is described as a branching structure generated by an L-system, so users can create many feather types and shapes by adjusting a few parameters. For efficient appearance rendering the authors derive a form of the bidirectional texture function that captures the small but visible geometric detail of the feather blade.

How to read this

Category: Method: feather modeling and rendering
Contributions: An L-system description of a feather as a branching structure, so users create many feather types and shapes by adjusting a few parameters
A bidirectional-texture-function based appearance representation capturing the small but visible geometric detail of the feather blade
An end-to-end pipeline for modeling and rendering realistic feathers and feathered birds
Context: Relates to procedural natural-structure modeling (L-systems) and image/appearance-based rendering via the bidirectional texture function, applied to feathers and full plumage.
Correctness: Validated by the realism of rendered feathers and feathered birds; reader caveat is that the BTF appearance model trades exact micro-geometry for efficient rendering, so results depend on how well the captured BTF represents the blade detail.
Clarity: Accessible; a first pass conveys both the L-system modeling and the BTF rendering idea, with a second pass for the BTF derivation.
How to read it: Read modeling (L-system) and appearance (BTF) as two separable halves; a second pass on the BTF form pays off if you care about efficient feather shading.

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Related work

Procedurally Generating Biologically Driven Feathers 2019 / CGI
A Biologically-Parameterized Feather Model 2002 / Eurographics
Rendering Iridescent Rock Dove Neck Feathers 2022 / SIGGRAPH
A Surface-based Appearance Model for Pennaceous Feathers 2024 / CGF

Keywords

feathers rendering modeling l-systems procedural bidirectional texture function btf plumage birds appearance branching structure texture synthesis

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