Physics2D.Linecast and Physics2D.Raycast don't seem to return null

Questions & Answers
1

Physics2D.Linecast and Physics2D.Raycast don’t seem to return a null RaycastHit2D as the help documentation would seem to suggest they should.

I keep getting null reference exceptions. Is there a bug with 3.4.x, I have checked and found no bug report.

I have the following code:

RaycastHit2D hit =  Physics2D.Linecast(new Vector2(a.x, a.y), new Vector2(b.x, b.y));
if (hit == null)
   return;//The Unity Editor says this is unreachable ;_;
print(hit.transform.name); //If there is a collider in the linecast, then this works

I get the same result with this:

RaycastHit2D hit =  Physics2D.Linecast(new Vector2(a.x, a.y), new Vector2(b.x, b.y));
if (hit != null)
  print(hit.transform.name); //If there is a collider in the linecast, then this works

Using Physics2D.Raycast gets me the same result

2

You need to compare the collider, the solution is as follows:

RaycastHit2D hit =  Physics2D.Linecast(new Vector2(a.x, a.y), new Vector2(b.x, b.y));
if (hit.collider == null)
   return;