EnergyHair: Sketch-Based Interactive Guide Hair Design Using Physics-Inspired Energy
EnergyHair: Sketch-Based Interactive Guide Hair Design Using Physics-Inspired Energy
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发表时间：
2022
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通讯作者：
Yuan Zhang;Shin-ichi Kinuwaki;Unaffiliated;Nobuyuki Umetani
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作者：
Yuan Zhang;Shin-ichi Kinuwaki;Unaffiliated;Nobuyuki Umetani
本文介绍了一种新的基于草图的发型创作界面，用于多视点立体捕捉的虚拟角色。单个头发通常通过插入导向头发来建模，导向头发是表示整体头发形状的向下采样的发束。与传统的几何建模不同，我们在导向毛发建模中融入了头发的物理属性，如重力、碰撞和弯曲阻力。在界面中使用与物理相关的形状优化，允许从最小的用户规格建模看起来自然的3D头发形状。我们提供了交互式素描工具，允许用户从多个视角指定头发形状。我们的界面生成关于设计的草图在多大程度上符合物理定律的反馈，使用户能够在艺术意图和物理自然度之间取得平衡。在此基础上，介绍了一种基于图像滤波得到的毛发方向的自动草图提示系统。
This study introduces a new sketch-based hairstyle authoring in- terface for virtual characters captured using multi-view stereo. Individual hairs are typically modeled by interpolating guide hairs, which are downsampled hair strands representing the overall hair shapes. Unlike conventional geometric modeling, we incorporate the physical properties of hairs, such as gravity, collision, and bending resistance, in guide hair modeling. The use of physics-related shape optimization in the interface allows natural-looking 3D hair shapes to be modeled from minimal user specifications. We provide an in- teractive sketch tool that allows the user to specify hair shapes from multiple viewing angles. Our interface generates feedback regard- ing how much a designed sketch conforms to the laws of physics, enabling the user to strike a balance between artistic intention and physical naturalness. We further introduce an automatic sketch suggestion system based on the hair orientation obtained using image filtering.