首先,unity2d中的camera有四大坐标系你需要了解清楚:
官方对unity camera的描述:
Description
A Camera is a device through which the player views the world.
A screen space point is defined in pixels. The bottom-left of the screen is (0,0); the right-top is (pixelWidth,pixelHeight). The z position is in world units from the camera.
A viewport space point