Vector
Constraint
矢量约束
Basic 基础Vector 病媒Vector Constraint
矢量约束
Tip: 提示:This tag only works after a 3D features have been generated, i.e., a 3D reconstruction has taken place. 这个标签只有在生成3D 特性之后才能工作，也就是说，3D 重建已经完成
Using this tag, one of the vertex cluster’s axes can be bound to the world or Object Tracker coordinate system and - even more importantly - the scaling of the vertex cluster can be defined.
使用这个标签，一个顶点集群的轴可以绑定到世界或者物体跟踪坐标系，更重要的是，可以定义顶点集群的缩放。
Use the tag as follows to calibrate (2 methods):
使用如下标签来校准(2种方法) :
- Create the tag for the respective 创建各自的标记Motion Tracker 运动跟踪器 or Object Tracker object. An axis with handles at each end will appear at the center of the Viewport. Drag these handles onto 2 Tracks or 2 features, respectively, that should be used to define the world or object axis: 或物体追踪对象。在视口的中心将会出现一个轴，每个轴的两端都有一个控点。将这些手柄分别拖到2个 Tracks 或2个特性上，这些特性应该用于定义世界或对象轴:
- Select the 选择Create Vector Constraint 创建矢量约束 tool (main menu 工具(主菜单
and click on the desired Track. A Vector Constraint tag with a linked Null object that matches the Track will be created automatically. 然后点击所需的轨道。将自动创建一个 Vector Constraint 标记，其中包含与 Track 匹配的链接 Null 对象
As soon as the axis is defined in the tag’s settings, the vertex cluster will be oriented accordingly. The value entered for Length (i.e., the actual real-world length, e.g., 100cm for a table edge) will scale the points accordingly.
一旦在标签的设置中定义了轴，顶点集群就会相应地定向。为 Length 输入的值(即，实际的真实长度，例如，表边缘为100厘米)将相应地缩放这些点。
创建矢量约束
This command creates a Vector Constraint tag with a matching linked feature (see previous paragraph).
这个命令创建一个 Vector Constraint 标记，该标记具有匹配的链接特性(参见前面的段落)。