Help me to undrstand the script

Unity Engine
1

i am using the below script,it s working fine.but i want to know y we must calculating distance and y mot using input.mouseposition.z,???

i am confused help me

if (Input.GetMouseButtonDown(0)) {
float distance = transform.position.z - Camera.main.transform.position.z;
targetPos = new Vector3(Input.mousePosition.x, Input.mousePosition.y, distance);
targetPos = Camera.main.ScreenToWorldPoint(targetPos);
}

transform.position = Vector3.MoveTowards (transform.position, targetPos, speed * Time.deltaTime);
}

2

Please use code tags whenever you show code:

The mouse position only contains x and y coordinates, which is just the position of you mouse on the screen. Not more, not less. Everything else needs to be computed. You can use a method as described or use raycasting or even something else.
In general it doesn’t even make sense to provide a z coordinate, because it would just be misleading and confusing.

3

Thanks for ur reply.

what is the use of screenpointtoworldpoint?

4

It translates screen coordinates to world coordinates…

5

what is mean by screen coordinates? and world coordinates?

6

Screen space is defined in pixels. The bottom-left of the screen is (0,0); the right-top is (pixelWidth,pixelHeight).

World space is an actual 3d position.

7

thanks fr ur reply