【摘要】 研究针对交互式虚拟环境提出了一种自适应变形方法,基于累进网格和层次式聚类,为模型构建一个累进网格二叉树;根据此结构和环境参数,将网格模型划分为若干个子网格分别进行简化,再缝合成一个多细节层次模型作为变形过程的输入。为了简化变形过程,变形约束被标准化为四种变形基元,根据空间映射规则投影到多细节层次模型上,控制变形操作和保持模型属性不变。实验表明该方法能够动态地灵活地构建多细节层次网格模型和调整各种变形约束,并应用在一个交互式虚拟环境即虚拟博物馆浏览系统中,实现实时的变形操作和良好的视觉效果。更多还原

【Abstract】 For interactive virtual environment,a novel adaptive method was proposed to make use of hierarchical clustering to establish a hierarchical progressive mesh binary tree.Based on this structure,the original model was segmented into submeshes,which were simplified separately according to different environment parameters.Finally,a multi-level-of-detail model was achieved for deformation.To accelerate deformation on the multi-level-of-detail model,four constraint primitives and spatial projection rules were designed to normalize deformation constraints and preserve mesh features.Experimental results demonstrate that the novel method can compose a multi-level-of-detail mesh and modify deformation constraints dynamically and flexibly,which has been embedded into an interactive virtual environment-a virtual museum browsing system to guarantee the realtime deformation with desirable visual quality.更多还原