Planar Constraint 平面约束Basic 基础Planar 平面
Planar
平面
Note that several of these parameters are only useful when used with the Motion Tracker object.
注意，其中几个参数只有在与运动跟踪器对象一起使用时才有用。
模式
相机轨迹定义平面
A plane will be created using the three start, end and middle positions of the camera’s animation path. This option is suited for camera movements around a given object, e.g., a hemisphierical camera movement around a tree. A plane would be defined for the animation that lies more or less parallel to the ground at the camera’s height (this mode is not suited for forward-moving camera paths).
一个平面将创建使用三个开始，结束和中间位置的相机的动画路径。这个选项适用于给定物体周围的摄像机移动，例如，一个半球摄像机绕树移动。在摄像机的高度上，动画会定义一个与地面大致平行的平面(这种模式不适合前移摄像机路径)。
特征定义平面
A plane will be created using the features in the Selection field.
将使用 Selection 字段中的特性创建一个平面。
轴心
Use this setting to define the world coordinate axis to which the plane will be perpendicular. In most cases this will be the Y axis if you want to make the plane parallel to the floor. If None is selected, the axis will remain undefined.
使用此设置定义平面将垂直于的世界坐标轴。在大多数情况下，如果你想让平面与地面平行，这将是 y 轴。如果没有选择，轴将保持未定义状态。
反向轴
Enable this option to reverse the axis, for example, if you have defined the Y axis and the camera is upside-down.
启用此选项可以反转轴，例如，如果您已经定义了 y 轴并且摄像机是上下颠倒的。
Selection
选择
选择
Here you will find all features that make up the plane.
在这里你可以找到组成飞机的所有特征。
This will normally be set automatically when the triangle is positioned interactively in the Viewport or selected via the Plane Constraint command. Any number of other features can also be placed into this field from which the average plane should be created.
当三角形交互定位在 Viewport 中或者通过平面约束命令选择时，这通常会被自动设置。任意数量的其他特性也可以放置到这个字段中，平均平面应该从这个字段中创建。
创建平面
Click on this button to create a Plane object that will be adapted precisely to the preview (triangle or quad). This object can, for example, then be used as a floor or a surface onto which shadows can be cast.
单击此按钮可创建一个平面对象，该对象将精确适应于预览(三角形或四边形)。例如，这个物体可以被用作地板或者表面，阴影可以投射到上面。
If used with an Object Tracker, the plane created will be subordinate to this one (and will move with it).
如果与物体跟踪器一起使用，所创建的飞机将从属于这一个(并将随之移动)。