構造的親和性:ケージベース形状設計のための一貫性アルゴリズム
Structural Affinity: An Algorithm for Coherent Cage-Based Shape Design
ケージベース変形において、内側ケージを外側ケージに平均値座標で結ぶ親和性行列を事前計算し、ハンドル変位の伝播を制御することで滑らかで自己交差の少ない変形を実現する手法を提案。ロボットの制御-形態共設計や形状最適化に応用。
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著者: Aviraj Newatia, Shengan Yang, Hantao Zhong, Rika Antonova
分類: cs.LG, cs.GR, cs.RO
原文アブストラクト
Cage-based deformation (CBD) parametrises 3D geometry through a small set of control handles, effectively enabling a variety of tasks from animation and interactive modelling to tool-based co-design, neural deformation transfer, and aerodynamic shape optimization. Many optimization approaches relying on CBD employ regularisation strategies to reduce the distortion of the deformed mesh by encouraging smooth, regular cage deformations. These techniques offer soft guidance to an optimization algorithm towards desirable deformations, but compete with the task objective rather than changing the deformation parameterization itself. In this work we introduce Structural Affinity for CBD, an explicit regularisation method which enables smooth deformations through control cages by exploiting a two-cage structure to couple cage-handle motion directly. Structural Affinity precomputes an affinity matrix using mean-value coordinates, binding the inner control-cage to a coarser outer-cage. This matrix defines how much a cage handle displacement propagates to neighbouring handles which substantially decreases and often eliminates cage self-intersections, reduces mesh distortion, and adds linear overhead at deformation time. Across robotic control--morphology co-design, source-to-target neural deformation transfer, and aerodynamic wing shape optimization, Structural Affinity produces more regular deformations and substantially reduces reliance on hand-designed structural loss terms. We report consistent gains on three complementary diagnostics: the cotangent Laplacian, a proxy for surface smoothness; cage distortion, capturing whether control handles move coherently; and surface roughness, which measures undesirable oscillation in wing geometry.