arXiv:2503.13579cs.GRcs.AI2025-03被引 2

自动适配任意骨骼与网格的绑定和权重生成,无需针对每种配置重新训练。

ASMR: Adaptive Skeleton-Mesh Rigging and Skinning via 2D Generative Prior

  • 基于2D生成先验,自适应对齐骨骼与网格比例并预测最佳骨架
  • 使用Diff3F作为语义特征,实现跨不同配置的鲁棒泛化
  • 无需特定配置监督,适用于多样化的角色动画绑定任务

尽管骨骼动作数据日益普及,但将其用于角色网格动画仍面临挑战,主要源于骨骼与网格配置的多样性。骨骼的体形和骨长需根据网格的尺寸与比例进行调整,确保所有关节准确位于角色网格内部;同时,由于骨骼结构(如关节数量、层级关系)和网格结构(如连接方式、形状)的差异,定义蒙皮权重也极为复杂。现有方法虽尝试自动化该过程,却难以应对骨骼与网格配置的双重变化。本文提出一种新方法,利用骨骼运动数据自动完成角色网格的绑定与蒙皮,可适配任意网格与骨骼配置。该方法预测与网格尺寸和比例匹配的最佳骨架,并为多种网格-骨骼组合定义蒙皮权重,无需针对每种情况提供显式监督。通过引入扩散3D特征(Diff3F)作为角色网格的语义描述符,实现跨配置的强泛化能力。我们通过定量与定性分析,全面评估了所提方法在预测骨架、蒙皮权重及变形质量方面的表现。

原文摘要 · Abstract (English)

Despite the growing accessibility of skeletal motion data, integrating it for animating character meshes remains challenging due to diverse configurations of both skeletons and meshes. Specifically, the body scale and bone lengths of the skeleton should be adjusted in accordance with the size and proportions of the mesh, ensuring that all joints are accurately positioned within the character mesh. Furthermore, defining skinning weights is complicated by variations in skeletal configurations, such as the number of joints and their hierarchy, as well as differences in mesh configurations, including their connectivity and shapes. While existing approaches have made efforts to automate this process, they hardly address the variations in both skeletal and mesh configurations. In this paper, we present a novel method for the automatic rigging and skinning of character meshes using skeletal motion data, accommodating arbitrary configurations of both meshes and skeletons. The proposed method predicts the optimal skeleton aligned with the size and proportion of the mesh as well as defines skinning weights for various mesh-skeleton configurations, without requiring explicit supervision tailored to each of them. By incorporating Diffusion 3D Features (Diff3F) as semantic descriptors of character meshes, our method achieves robust generalization across different configurations. To assess the performance of our method in comparison to existing approaches, we conducted comprehensive evaluations encompassing both quantitative and qualitative analyses, specifically examining the predicted skeletons, skinning weights, and deformation quality.

角色动画自动绑定生成模型网格对齐

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