I’m working on an infinite horizontal scroller where the entire map is divided into Segments of a uniform width. Every frame, I want to test each segment to see if it’s outside of the viewport, and if it is I want to teleport it ahead of the player. It’s hard to describe, but seems pretty trivial to implement:

```
public float segmentWidth; //X dimensions of a single map segment
public List<MapSegment> segmentList; //list of map segments in pool
void MapSegmentUpdate()
{
//Check if each section is on-screen, if not, move it left or right by a number of units equal to its width * the number of sections in the list
for (int i = 0; i < segmentList.Count; i++)
{
Vector3 mapVec;
mapVec = Camera.main.WorldToViewportPoint(segmentList*.gameObject.transform.position);*
```

*if (mapVec.x < 0) //Segment is left of camera*

*{*

*Vector3 targetPosition = segmentList*.transform.position; //Get current position of segment**

*targetPosition.x = segmentList_.transform.position.x + (segmentWidth * segmentList.Count); //Offset X so current segment becomes rightmost in map_*

*segmentList*.transform.Translate(targetPosition);**

*} else if (mapVec.x > 1) //Segment is right of camera*

*{*

*Vector3 targetPosition = segmentList*.transform.position;**

*targetPosition.x = segmentList_.transform.position.x - (segmentWidth * segmentList.Count); //Offset X so current segment becomes leftmost in map_*

*segmentList*.transform.Translate(targetPosition);**

*}*

*}*

*}*

*This looks right to me: the number of segments in a list times each segment’s width tells you how long the entire chain of segments is, and adding/subtracting that value from the current segment’s X coordinate should move it to the far left/right of the segments, but instead this is producing huge values- Y is always listed as “-Infinity”, and the X value is in the octillion or nonillion range. This makes me assume I’m slipping on a banana peel somewhere and accidentally multiplying my vectors exponentially, but no matter how many times I look at it, my math looks right to me- is there an obvious issue with my calculation?*