How to scroll the background in a 2D game

Questions & Answers
1

I’m creating a simple 2D scroll game (like flappy bird, character goes all the way to the right and the background & obstacles are automatically and repeatedly generated)

I created three backgrounds, left, middle and right, and place them next to each other. A script called scrolling is added to each background. The script goes:

public GameObject next
public int distance

void  OnTriggerEnter2D(Collider2D c){
    next.transform.Translate(new Vector3(distance,0,0));
    Debug.Log("enter");
}

“left” acts as next for right, right for middle, and middle for left, so they pave the road ahead in turn on and on.
A Physics2D trigger is placed on the background (which is a rectanglular sprite), as well as a circle collider on the main character. However, when the character enters…nothing at all happened. Even the log did not show. Does anyone know why this happened?

Or, after I rethought about it, would the reason be that I simply “translate” the main character to make it move in one direction? Since I want him to move uniformly in x direction. But would this make him a kinematic object, so that the collision with the trigger doesn’t count?

2

If the script posted above is on the background, then the Collider2D should be on the character, right? And it should have an option in the inspector for “Trigger”, I think. I usually work with 3D and this is the way it works there. OR you could try putting the script above on the character, just change the code a bit to look like this…

void OnTriggerEnter2D(Collider2D c)
{
     c.transform.Translate(new Vector3(distance,0,0));
     Debug.Log("enter");
}//end of OnTriggerEnter2D()