In a negative curvature model, two lines that would be parallel on a flat plane will extend away from each other.

在负曲率模型下，平面上平行的两条线可能彼此远离。

youdao

For example, if you have an airplane, you would model two versions. One where the plane consists of a single GameObject with Mesh Renderer and scripts for airplane physics.

例如，如果有架飞机，要准备两个版本的模型，其中一个飞机包含单个游戏物体带有网格渲染器和飞机物理学的脚本。

youdao

The next topic is camera calibration and we give an ordinary way to calibrate and two calibration method of using one model plane.

首先介绍摄像机的透视投影模型，并讲述了普通摄像机标定的方法和两种平面模板的标定方法。

youdao