发表机构
School of Computer Science and Technology, Xidian University（西安电子科技大学计算机科学与技术学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
FractureFields针对断裂3D高斯模拟的跨碎片动量泄漏问题，提出拓扑自适应多场迁移与动量守恒接触投影方法，消除跨碎片混合并减少碰撞穿透。
AI 中文摘要
物理集成的3D高斯表示使直接将图像重建资产模拟为粒子成为可能，但当前的Gaussia-MPM管线即使在断裂后仍保留单一欧拉速度场。当断开的碎片共享插值支持时，它们仍会写入和读取相同的网格节点，产生跨碎片动量泄漏，表现为残余粘附和非物理拉伸。我们提出FractureFields，一种用于断裂3D高斯对象的拓扑自适应迁移方法。在结构事件分配持久碎片标识后，FractureFields在单次P2G传递中构建碎片特定的质量和动量场，独立推进每个场，并执行场感知的G2P更新，使粒子仅采样自身碎片的网格状态。为处理重新接触，我们添加了动量守恒的接触投影，仅当两个碎片场接近时应用大小相等、方向相反的法向冲量，否则保持自由分离。在重建场景和受控重新接触基准上的实验表明，碎片条件路由从根本上消除了已实现的跨碎片混合，而接触投影在碰撞期间减少了穿透，且不会重新引入残余耦合。总体而言，我们认为断裂后模拟应将结构断开视为局部动力学状态的变化，而非仅本构应力的变化。
英文摘要
Physics-integrated 3D Gaussian representations make it possible to simulate image-reconstructed assets directly as particles, but current Gaussia-MPM pipelines keep a single Eulerian velocity field even after fracture. When disconnected fragments share interpolation support, they still write to and read from the same grid nodes, producing cross-fragment momentum leakage that appears as residual adhesion and non-physical stretching. We present FractureFields, a topology-adaptive transfer for fractured 3D Gaussian objects. After a structural event assigns persistent fragment identities, FractureFields builds fragment-specific mass and momentum fields in a single P2G pass, advances each field independently, and performs a field-aware G2P update so particles only sample their own fragment's grid state. To handle re-contact, we add a momentum-conserving contact projection that applies equal and opposite normal impulses only when two fragment fields are approaching, preserving free separation otherwise. Experiments on reconstructed scenes and a controlled re-contact benchmark show that fragment-conditioned routing eliminates realized cross-fragment mixing by construction, while contact projection reduces interpenetration during collision without reintroducing residual coupling. Overall, we argue that post-fracture simulation should treat structural disconnection as a change in local dynamical state, not merely a change in constitutive stress.
Comments10 pages, 4 figures
