面向网络应用的三维树木模型简化方法研究

Research on Three-dimensional Tree Model Simplification for Web Applications

在网络环境下进行三维树木模型的绘制与传输,不仅对模型逼真度有着较高要求,还更需保证网络交互的实时性。由于现有的基于几何或图像的三维模型简化方法无法满足网络应用对三维树木的模型细节和网络传输速度的要求,因此提出了一种面向网络应用的三维树木模型简化方法。该方法对树木枝干部分的骨架节点进行提取,并采用非均匀的骨架简化策略对树木模型的枝干部分进行简化;此外,还利用纹理树冠方法对树冠部分进行简化,通过采用凸包纹理模板贴图重构树冠,使得重构后得到的模型与原始模型具有很好的相似度。实验和应用结果表明,面向网络应用的三维树木模型简化方法在保证视觉质量的基础上,能进一步减少模型文件的存储容量,从而提高树木模型的绘制效率及其在网络中的传输速率。

Construction and transmission of 3Dtree models under network environments require not only fine model fidelity,but also high efficiency of real-time interaction.Because of the existing geometry-based or image-based 3Dmodel simplifications unable to satisfy the model details and storage capacity requirements of 3Dtree models,a novel simplification method of 3Dtree model for web applications was proposed.This method extracts the skeleton nodes of branches of tree model,and simplifies braches by using non-uniform skeleton simplification method.Furthermore,it simplifies crowns of tree models by using crown textures and reconstructs them with convex hull based texture mapping,so as to improve the similarity of simplified 3Dtree models.The applications show that this method can reduce storage capacity of model files,and improve the transmission efficiency of network on a basis of excellent visual quality.