Geometric modeling and its graphic presentation is the important part of computer aided-design techniques.
几何模型的建立及其图象表达是计算机辅助设计的重要组成技术。
The traditional modeling techniques are mainly focused on physical modeling and geometric representation, so it makes the conceptual design of products not obtain effective technique support.
由于传统建模技术主要集中于物理建模和几何表示方面，致使产品概念设计阶段缺乏有力的技术支持。
We deeply discuss the techniques on geometric modeling. Under the condition of simulating virtual forest landscape, the primary landscapes are terrain and the tree.
对虚拟森林环境的建模技术进行深入探讨，主要内容包括虚拟地形的构建和林木的几何重建技术。
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