Flexible 3D Cage-based Deformation via Green Coordinates on B\'{e}zier Patches

TL;DR

This paper introduces a novel cage-based deformation method using Bézier patches and Green coordinates, enabling flexible, high-curvature deformations with improved accuracy and compactness over traditional methods.

Contribution

It extends cage-based deformation to curved boundaries with Bézier patches and derives Green coordinates for shape-preserving deformation, enhancing flexibility and precision.

Findings

Handles curved and high-curvature deformations effectively

Achieves shape-preserving deformation with smooth boundaries

Provides a compact and precise curved cage representation

Abstract

Cage-based deformation is a fundamental problem in geometry processing, where a cage, a user-specified boundary of a region, is used to deform the ambient space of a given mesh. Traditional 3D cages are typically composed of triangles and quads. While quads can represent non-planar regions when their four corners are not coplanar, they form ruled surfaces with straight isoparametric curves, which limits their ability to handle curved and high-curvature deformations. In this work, we extend the cage for curved boundaries using B\'{e}zier patches, enabling flexible and high-curvature deformations with only a few control points. The higher-order structure of the B\'{e}zier patch also allows for the creation of a more compact and precise curved cage for the input model. Based on Green's third identity, we derive the Green coordinates for the B\'{e}zier cage, achieving shape-preserving deformation with smooth surface boundaries. These coordinates are defined based on the vertex positions and normals of the B\'{e}zier control net. Given that the coordinates are approximately calculated through the Riemann summation, we propose a global projection technique to ensure that the coordinates accurately conform to the linear reproduction property. Experimental results show that our method achieves high performance in handling curved and high-curvature deformations.