Planar
Constraint
平面约束
Basic 基础Planar 平面Planar Constraint
平面约束
Tip: 提示:This tag works only after 3D features have been created, i.e., a 3D reconstruction has taken place. 这个标签只有在创建了3D 特性之后才起作用，也就是说，进行了3D 重建
Using this tag, 3 or more Tracks/features can be selected that can be used to define a plane (e.g., the floor or, for an Object Tracker, a layer to be replaced) within the vertex cluster. Since this plane will most often correspond to a layer in the world coordinate system you can also define the world axis to which the plane should lie perpendicularly.
使用这个标签，可以选择3个或更多的轨道/特性，可以用来定义顶点集群中的平面(例如，楼层，或者，对于对象跟踪器来说，一个要替换的层)。因为这个平面通常对应于世界上的某一层，所以你也可以定义这个平面应该垂直地平行于世界的坐标系。
The tag can be used as follows for calibration (3 methods):
标签可用于以下3种校准方法:
- Create the tag for the respective 创建各自的标记Motion/Object Tracker 运动/物体追踪器 object. A triangle will appear at the center of the Viewport. Drag each of the triangle’s three corner points to a Track or feature that lies on one of the planes: 对象。一个三角形将出现在视口的中心。将三角形的三个角点中的每一个拖动到其中一个平面上的轨迹或特征:
Make sure that the points do not lie to closely together and that the triangle they create is as extensive as possible. As soon a the axis is defined in the tag’s Axis setting (e.g, Y for the floor) the triangle will be colored accordingly and the vertex cluster, including the camera, will be re-oriented so that all 3 features lie on the corresponding axis plane.
确保这些点不会紧密地靠在一起，并且它们创建的三角形尽可能广泛。一旦在标签的轴设置中定义了一个轴(例如，y 表示地板) ，三角形就会相应地着色，顶点集群(包括相机)也会重新定向，这样所有3个特征都位于相应的轴平面上。
- With 用
3D View 3D 视图Shift 转移 and 及Cmd/Ctrl can be used to add or remove selections). A median plane will be calculated using the selected features and a square preview will be displayed that will be colored according to the axis that was defined. Using this method, errors for only three Tracks/features can be minimized. The deviance of each feature to the median plane will be displayed, which makes it possible for you to delete the largest deviations: 可以用来添加或删除选择)。一个中间平面将被计算使用选定的特点和一个正方形预览将显示，将根据轴定义的颜色。使用这种方法，只有三个轨道/特征的错误可以最小化。每个特征与中值面的偏差都会显示出来，这样你就可以删除最大的偏差: - Select the 选择Create Planar Constraint 创建平面约束 tool (main menu: 工具(主菜单:
) and click on three Tracks that lie on a given plane. A Planar Constraint tag with linked features that match the Tracks will automatically be created. ) ，然后点击给定平面上的三个轨道。一个平面约束标签与轨道匹配的链接特性将自动创建
创建平面约束
This command creates a Planar Constraint tag with corresponding links to the features (see above).
这个命令创建了一个 Planar Constraint 标记，其中包含到这些特性的相应链接(见上文)。