头戴设备VR环境下基于网格变形的交互雕刻建模

为满足非专业用户的3D模型生成和编辑需求，提出一种在头戴设备VR环境下的数字雕刻系统.对初始化的三维模型进行半边结构拓扑表示，根据VR交互手柄的笔刷位置和空间划分来高效查询网格雕刻区域；对待雕刻顶点按法向变形以生成新模型，为保证得到高质量网格形状和鲁棒雕刻过程，对新移动的顶点所在边长进行排序并重新局部网格化；对用户的三维输入实时反馈变形并迭代生成具有丰富细节的二维流形模型.借助本文系统，将用户与所雕刻模型置于同一三维空间，增加了建模交互性，降低了建模难度，即使非专业建模人员也能快速实时雕刻生成复杂三维模型.
Abstract: A digital sculpture system in the HMD (head-mounted device) VR environment was proposed to let non-professional users create and edit 3D models. First of all, an initial 3D model was represented with half-edge topology, and the sculpture area was searched according to the brush position of the VR handles, which was accelerated by a spatial partition. In order to ensure a high-quality mesh shape and a robust sculpture process, the newly transformed vertices were sorted and re-localized. Finally, the mesh deformation was interactively calculated according to users' 3D inputs; the 2D manifold model with rich details was iteratively generated. Using the proposed system, the users and the virtual models are placed within the same 3D space, which can increase the modeling interactivity and reduce the difficulty. Therefore, even non-professionals can create complex 3D shapes quickly by procedural sculpture.