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Variousthingsinrealworldhavevariousmodelingmethodsin3DSMAX,andvarybydifferentpersonal...
Various things in real world have various modeling methods in 3DS MAX, and vary by different personal observation capacity or operating habits. It should be said that there was no unified modeling standards ， and different methods are used to different models.
2.1. Terrain Modeling
Digital terrain model (DTM) is a visualization of an important part of the visual scene. In reservoir construction layout, the terrain is distributed widely. Meanwhile, dynamic cutting-and-filling of roads and slopes are required. In response to the features above, the following measures have been taken in constructing DTM:
(1) Build a terrain vertices database, and then use Boolean operation to modify and manage terrain data so as to realize the fill and cut design procedures. For example, to achieve the spillway excavation, three-dimensional data model of the terrain and spillway excavation surfaces need to be established separately. First a triangular irregular network (TIN), just the terrain model, needs to be generated based on the terrain data (i.e. contour lines), and then spillway excavation surfaces are constructed according to the spillway data, finally Boolean operation is applied, which can reflect the excavating process of the spillway well.
(2) Make the terrain model multiple-precision and Multi-resolution texture so as to get a rapider display of the scene. The scene of the reservoir construction layout is wide distributed and need to be divided into several blocks according to their importance; more important blocks are constructed based on high-precision topographic data, while less important ones can be constructed based on low-precision topographic data. In this way, the display speed of the scene can be improved greatly and meanwhile the authenticity of general layout can be well guaranteed. The reservoir construction layout contains the reservoir area and the extension of terrain. The reservoir area, which is the location of project layout and quite important, is established through high-precision topographic data and high-resolution texture. The terrain away from the reservoir area is just opposite.
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2.1. Terrain Modeling
Digital terrain model (DTM) is a visualization of an important part of the visual scene. In reservoir construction layout, the terrain is distributed widely. Meanwhile, dynamic cutting-and-filling of roads and slopes are required. In response to the features above, the following measures have been taken in constructing DTM:
(1) Build a terrain vertices database, and then use Boolean operation to modify and manage terrain data so as to realize the fill and cut design procedures. For example, to achieve the spillway excavation, three-dimensional data model of the terrain and spillway excavation surfaces need to be established separately. First a triangular irregular network (TIN), just the terrain model, needs to be generated based on the terrain data (i.e. contour lines), and then spillway excavation surfaces are constructed according to the spillway data, finally Boolean operation is applied, which can reflect the excavating process of the spillway well.
(2) Make the terrain model multiple-precision and Multi-resolution texture so as to get a rapider display of the scene. The scene of the reservoir construction layout is wide distributed and need to be divided into several blocks according to their importance; more important blocks are constructed based on high-precision topographic data, while less important ones can be constructed based on low-precision topographic data. In this way, the display speed of the scene can be improved greatly and meanwhile the authenticity of general layout can be well guaranteed. The reservoir construction layout contains the reservoir area and the extension of terrain. The reservoir area, which is the location of project layout and quite important, is established through high-precision topographic data and high-resolution texture. The terrain away from the reservoir area is just opposite.
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现实世界中的各种物体在计算机三维动画技术里都有不同的建模方法， 并且随着不同的个人观察能力或者操作习惯而改变。因此可以说没有统一的模型标准，不同的方法适用于不同的模型。
2.1 地形建模
数字地面模型（DTM）是视觉场景中视觉化很重要的一个部分。在水库建设的布局中，地形被广泛地分布。与此同时，动态的道路和斜坡的挖填是被要求的。为了回应上述特征，在构建地形模型会采取以下措施：
（1）建立一个地形顶点数据库，然后使用布尔运算来修改和管理地形数据以便达到填挖的设计程序。 例如，实现溢洪道的挖掘，地形的三维数据和溢洪道的表面挖掘需要分别建立。首先，一个三角网模型，就像地形模型，需要在地形数据（也就是等高线）的基础上产生，其次，溢洪道的表面挖掘是依据溢洪道数据而构建的，最后布尔运算才能实施，这也反映出溢洪口的挖掘过程。
（2）制造多精度和多分辨率质地的地形模型以便于更快地获得场景的展示。水库建设的现场布局是广泛分布的并且需要根据他们的重要性分成几个段； 稍重要点的区块就会根据高精密度的地形数据来构建，然而不太重要的区块就会依据低精密度的地形数据来构建。这样，场景的展示速度就会大大提高，同时，总体设计的真实性也可以被很好的保证。水库的建设布局包含水库区域和地形的延展。水库区域，是项目布局的位置，相当重要，所以要通过高精密度的地形数据和高分辨率的质地来建立。远离水库方向的地形则恰恰相反。
2.1 地形建模
数字地面模型（DTM）是视觉场景中视觉化很重要的一个部分。在水库建设的布局中，地形被广泛地分布。与此同时，动态的道路和斜坡的挖填是被要求的。为了回应上述特征，在构建地形模型会采取以下措施：
（1）建立一个地形顶点数据库，然后使用布尔运算来修改和管理地形数据以便达到填挖的设计程序。 例如，实现溢洪道的挖掘，地形的三维数据和溢洪道的表面挖掘需要分别建立。首先，一个三角网模型，就像地形模型，需要在地形数据（也就是等高线）的基础上产生，其次，溢洪道的表面挖掘是依据溢洪道数据而构建的，最后布尔运算才能实施，这也反映出溢洪口的挖掘过程。
（2）制造多精度和多分辨率质地的地形模型以便于更快地获得场景的展示。水库建设的现场布局是广泛分布的并且需要根据他们的重要性分成几个段； 稍重要点的区块就会根据高精密度的地形数据来构建，然而不太重要的区块就会依据低精密度的地形数据来构建。这样，场景的展示速度就会大大提高，同时，总体设计的真实性也可以被很好的保证。水库的建设布局包含水库区域和地形的延展。水库区域，是项目布局的位置，相当重要，所以要通过高精密度的地形数据和高分辨率的质地来建立。远离水库方向的地形则恰恰相反。
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