如果观察这些点，比如这个，那么那个，当然是等于重力，如果那里有个物体,在y方向。
So if we visit those points, for instance here, then there is, mg of course, gravity, mg, if there is an object there in the y direction...
方法通过Y迷宫和新物体辨别实验检测了小鼠的学习记忆能力；
Methords Learning and memory functions in mice were examined using Y-maze and novel object recognition tests.
潘兵，谢惠民，李艳杰。用于物体表面形貌和变形测量的三维数字图像相关方法[J]。实验力学，2007,226：556- 567。
PAN b, XIE h, LI Y. 3d digital image correlation method for object surface topography and deformation measurement [j]. Journal of Experimental Mechanics, 2007, 22 (6) : 556-567.
先找到物体包围盒的中心，找到物体最大和最小的X，Y，Z坐标，两个坐标中点就是物体包围盒的中心。
One way is to find the geometric center of the object by computing the object bounding box by finding the maximum and minimum X, Y and Z values, then computing the mid-point of the bounding box.
指南针-允许你点击任何物体作为指南针，该物体的y轴将作为物理天空系统的正北。
Compass - lets you pick any object that will be used as a north indicator. The object's positive Y-axis will be used as the north indicator for the sky system.
指南针-允许你点击任何物体作为指南针，该物体的y轴将作为物理天空系统的正北。
Compass - lets you pick any object that will be used as a north indicator. The object's positive Y-axis will be used as the north indicator for the sky system.
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