求解释----Domains and handles。

“管理”-》“结贴”

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理解Domains和handles，首先知道Morph。
HyperMorph是一个内嵌在HyperMesh中的网格变形模块。通过它可以使用多种交互式的方法来改变网格形状。
Morphing过程包括将模型分成多个域（domains），这些域的形状由handles来控制。通过移动handles，可以改变domains的形状，以及domain中节点的位置。网格的变形比较合理----即在移动handles附近的节点的移动距离较大，而较远的节点移动距离较短。在handles之间的区域，网格自动延伸或压缩以适应domain的变化。
domains包含根据不同的模型特征组织起来的节点和单元，这些特征包括边界、断角和曲率的变化。当HyperMorph自动创建domain时，它会决定对应的handle是如何影响节点的。如果手动地创建和编辑domains，则由用户来决定影响方式。

Domains和handles到底是什么东西？
其实Domains简单地理解为一个Domains类似于一个单元。而一个handles类似于一个节点。
HyperMorph将domains和handles放到两个基本的群组（groups）中：global和local。
Global这个群组包含一个单独的domain（即global）及其8个相关的globa handles。
Local这个群组包含了四种类型的local domains：1D domains（类似于bars和rigid单元）、2D domains（类似于shell单元）、3D domains（类似于solid单元）和edge domains。
handles可以分为两类：independent和dependent。一个independent handle的移动只由它本身来控制，而不受其它的handle的影响。而一个independent handle的移动既取决于它本身，同时也受其它相关联的handle的影响。

更好地学习HyperMorph，请参考Altair Optistruct基础培训教程 Day2。

HyperMorph uses domains, handles, partitions, and morphing criteria to alter the shape of an entire model or some portion of it. You have control over this process by relocating nodes, assigning constraints to various nodes, making use of biasing and taking advantage of the symmetry of the part.

You divide a model into domains each of which have "handles" and manipulate the handles to change the shape over the entire model or some portion of it. When the handles move the shapes of the domains change and the positions of the nodes within the domains also change. During the morphing process the mesh changes in a logical way: the nodes near the moving handles move a greater distance than the nodes near the stationary handles and the mesh stretches or compresses to match the changes in the domain.

Domains consist of nodes or elements grouped according to various modeling features such as edges, break angles, and curvature changes. Handles accompany each domain and provide the mechanism to modify the shape of the model or a portion of the model.

Domains and handles are divided into two basic groups, global and local. The global group consists of a single domain called the global domain and eight global handles that form a box around the model. Every node in the model is part of the global domain and thus, global handles can influence every node in the model. The intent of the global handles are to make large-scale shape changes to the model. Wherever there is a high density of nodes, you may also find a global handle.

The local group consists of four types of local domains (1D domains, 2D domains, 3D domains, and edge domains) and their handles. These local handles can only influence nodes contained in the domains they are associated with. Use local handles to make localized shape changes to the model.

Models may have only a global domain if you want to make changes over the entire model. Models may have only local domains so changes are applied to a specific portion of the model. In addition, models can also contain both global and local handles and domains, allowing you to logically combine both large and small shape changes.

The following is a table describing the various domains and its corresponding symbol used in the display of the model.