如果物体通过几何变换而被放置在世界坐标系中，比如通过平移和旋转，那么视图跟踪他在世界坐标系中位置变换的轨迹可能会是一个艰难的工作。
If the object is positioned in the world through geometric transformations, such as translations and rotations, then keeping track of its position in world coordinates can be a hard task.
从理论上讲，通过坐标轴旋转将二次方程化简为规范形式，从而讨论其曲线的形状，这已是讨论得相当明了的课题。
Theoretically speaking, it is a rather-clearly discussed subject to standardize the quadratic equation into the normal forms by spinning the coordinate axis so as to approach the shapes of its curves.
运动通过平移，旋转，以及每一个移动对象的局部坐标系统的非一致缩放来实现。
Motion is specified by translations, rotations, and nonuniform scalings of the local coordinate system of each moving object.
应用推荐