大规模三维植被场景实时可视化方法
A real-time visualization method for large 3-D vegetation scenes
查看参考文献18篇
|
文摘
|
采用L系统结合野外观测数据来构建植被单体的三维结构模型,根据植被模型特点,分别对枝干和树叶两个组成部分进行几何简化,大幅度减少模型所需的几何要素数量。在冠层模型简化中,提出了分层LOD模型提取方法,该方法可以高效提取出多复杂度的冠层LOD模型,同时保证组成LOD模型的每片叶子都符合最小化误差方程的要求。在实时渲染过程中,依据LOD技术对大规模植被实时可视化。为了实时得到植被在动态LOD场景中所需要的复杂度,提出了一套LOD植被模型调用的新标准:用衰减因子描述植被密度和视距对植被细节程度衰减的影响,为动态LOD场景提供连续变化的复杂度标准。 |
|
其他语种文摘
|
This paper addresses an approach for dynamic and continuous multi-resolution visualization of large forests.Firstly,the approach uses the L-systems to generate 3D tree models,which are composed of two kinds of geometric elements: branches and leaves.The plants are simplified respectively to multi-resolution models of branches and foliage by our method.Secondly,the approach quantifies the resolution of LOD models by the length of branches and the quantity of foliage.The branch length for the branch LOD model and the leaf quantity for the foliage LOD model are obtained by the decay factor.Taking the values as the criterion,we extract LOD models from the multi-resolution models of branches and foliage in real time.Finally,we render the forest scene.This paper presents a continuous LOD rendering for forest landscape,and the main originalities of our method are summarized as follows.(1) To improve the efficiency for extracting the continuous LOD models,the multi-resolution chains and the binary tree structures are established respectively for the branches and the crowns,both of which consist of the preliminary models of the tree.(2) Our method for generating crown LOD models here shows that,they can implement large forest scene real-time visualization.(3) This paper makes new criteria for the LOD models,which use the decay factor to act on the original branch length and the original leaf quantity.In this way,the levels for displaying trunk and branches are calculated.This method is applicable to all kinds of plants with strong universality and practicability.So how to simplify crowns of such kind of trees is another important research subject.In future work,we should combine geometry-based and image-based simplification methods to further speed up visualization of large plant scenes. |
|
来源
|
地理研究
,2012,31(3):565-577 【核心库】
|
|
关键词
|
L系统植被
;
动态LOD
;
几何简化
;
森林场景
|
|
地址
|
1.
中国气象局国家卫星气象中心, 北京, 100081
2.
武汉大学, 测绘遥感信息工程国家重点实验室, 武汉, 430079
|
|
语种
|
中文 |
|
文献类型
|
研究性论文 |
|
ISSN
|
1000-0585 |
|
学科
|
自动化技术、计算机技术 |
|
基金
|
中国气象局小型基建项目
;
中国气象局关键技术项目
;
国家发改委项目
;
公益性行业（气象）科研专项
|
|
文献收藏号
|
CSCD:4490595
|
参考文献 共
18
共1页
|
|
1.
宋铁英. 一种基于图象的林分三维可视模型.
北京林业大学学报,1998,20(4):93-98
|
被引
24
次
|
|
|
|
|
2.
Jakulin A.
Interactive Vegetation Rendering with Slicing and Blending. Eurographic Short Presentations,2000:273-282
|
被引
1
次
|
|
|
|
|
3.
Lluch J. Procedural Multiresolution for Plant and Tree Rendering.
2nd international conference on Computer Graphics,2003:31-38
|
被引
1
次
|
|
|
|
|
4.
Lluch J. An image-based multi-resolution model for interactive foliage rendering.
Journal of WSCG,2004,12:507-520
|
被引
4
次
|
|
|
|
|
5.
陈彦云. 高度复杂植物场景的构造和真实感绘制.
计算机学报,2000,23(9):917-925
|
被引
11
次
|
|
|
|
|
6.
Oppenheimer P. Real time design and animation of fractal plants and trees.
Computer Graphics,1986,22(4):55-64
|
被引
14
次
|
|
|
|
|
7.
Levoy M.
The use of points as a display primitive. Technical Report,Computer Science Department, NC 27514,1985
|
被引
1
次
|
|
|
|
|
8.
Weber J.
Creation and Rendering of Realistic Trees. In:Robert Cooked. SIGGRAPH 95,1995:119-128
|
被引
1
次
|
|
|
|
|
9.
Deussen O. Interactive visualization of complex plant ecosystems.
IEEE visualization’02,2002(10):219-226
|
被引
1
次
|
|
|
|
|
10.
Remolar I.
Geometric Simplification of Foliage. Eurographics'02Short Presentations,2002:397-404
|
被引
1
次
|
|
|
|
|
11.
Remolar I. View-dependent multiresolution model for foliage.
Journal of WSCG,2000,3/11(2):370-378
|
被引
1
次
|
|
|
|
|
12.
Zhang X. Progressive polygon foliage simplification.
Proceeding of 2003’International Symposium on Plant Growth Modeling,Simulation,Visualization and Their Applications,2003:217-230
|
被引
1
次
|
|
|
|
|
13.
Zhang X. Multiresolution plant models with complex organs.
Proceedings of ACM SIGGRAPH International Conference on Virtual Reality Continuum and Its Applications VRCIA,2006:331-334
|
被引
1
次
|
|
|
|
|
14.
Campos C.
A multiresolution model for non-photorealistic rendering of trees. ICCS 2006, Part II,LNCS 3992,2006:310-317
|
被引
1
次
|
|
|
|
|
15.
过志峰.
基于模型的北方针叶林雷达散射特性分析及生物量反演研究.博士学位论文,2005
|
被引
1
次
|
|
|
|
|
16.
沙从术. lod技术在三维地形图实时可视化中的应用研究.
价值工程,2011(22):55-61
|
被引
1
次
|
|
|
|
|
17.
Kumsap C. The technique of distance decayed visibility for forest landscape visualization.
International Journal of Geographical Information Science,2005,19(6):723-744
|
被引
1
次
|
|
|
|
|
18.
Chiu S L. Fuzzy model identification based on cluster estimation.
Journal of Intelligent and Fuzzy Systems,1994,2(3):267-278
|
被引
144
次
|
|
|
|
|
了解气象卫星更多信息，请访问