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If an object is located at (x, y, z) and a camera is located at (cx, cy, cz), then [x-cx, y-cy, z-cz] is a vector that points from the camera to the object. Therefor, the following example points a camera at an object:
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Northdragon provides many commands to simplify rotating and aiming the camera, so that you don’t have to calculate the vector direction every time you want to turn the camera. The first is the point_at command:
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If an object is located at (x, y, z) and a camera is located at (cx, cy, cz), then [x-cx, y-cy, z-cz] is a vector that points from the camera to the object. Therefor, the following example points a camera at an object:
若物体位于坐标点（x,y,z），相机位于(cx, cy, cz)，则[x-cx, y-cy, z-cz]为从相机到物体的一个矢量。下例中相机朝向某物体：

Northdragon provides many commands to simplify rotating and aiming the camera, so that you don’t have to calculate the vector direction every time you want to turn the camera. The first is the point_at command:
Northdragon 为相机提供多种转动及对焦指令，您在转动相机后无需计算向量方向。第一条为 point_at 指令：

如果一个物体位于坐标(x, y, z)上，并且摄像头位于坐标(cx, cy, cz)上，那么矢量 [x-cx, y-cy, z-cz]就是从摄像头指向该物体。因此，下面的例子就是从摄像头指向物体。

如果一个物体被定为在（x,y,z）坐标上，一个相机定为在(cx, cy, cz)坐标，那么[x-cx, y-cy, z-cz]就是从相机到物体的一个矢量。因此，下面的例子指出了一个相机在物体的位置上

Northdragon提供了很多命令来简化转动矢量和朝向相机，因此在你旋转相机的时候不需要每次都计算矢量的方向。首先是点_按照指令

如果一个物体位于坐标(x, y, z)上，同时一个摄像机位于坐标(cx, cy, cz)上，那么[x-cx, y-cy, z-cz]就是从摄像机瞄向该物体的矢量 。所以，下面就是一个摄像机瞄向物体的例子：