Unity Foundation (3) -- various coordinate systems in unity

1. World coordinates ： Image understanding means that the object is in the whole infinite unity The location of space , Some are also called absolute coordinates . Access method ：（transform.position）

2. Local coordinates ： Namely unity Coordinates displayed on the right side of the interface screen , Represents the coordinates of the object relative to the parent object （ When the parent object is empty, the two are the same )  (transform.localposition)

3. Screen coordinates ： Take the bottom left of the screen （0,0） As a starting point The upper right （screen.width, screen.height）  Is the position of the object in the coordinate system ,Z Values in 2D In the screen is 0 

4. viewport （ window ） coordinate ： Take the bottom left of the screen （0,0） As a starting point The upper right （1, 1） The coordinate system of  

5. GUI Coordinate system ： Take the upper left as （0,0） The starting point The lower right （screen.width, screen.height） For the coordinate system

 

Pay attention to the screen coordinates to the world coordinates ： Because the screen coordinates are 2D In the use of screenToWorldpoint Method will make an error , It is suggested to first convert the world coordinates of the object into screen coordinates and then assign values to the Z Axis coordinates , Override this method .