2D raycast distance is incorrect?

Questions & Answers
1

The following code should display the distance between the origin and the impact point, but instead it shows the length of the ray minus the actual distance.

RaycastHit2D hit = Physics2D.Raycast( transform.position, -Vector2.up, 10.0F );
Debug.Log(hit.distance);

this code gives me the correct value

RaycastHit2D hit = Physics2D.Raycast( transform.position, -Vector2.up, 10.0F );
Debug.Log(10 - hit.distance);

Is this a bug or is there something different about 2d raycasts…?

2

I can confirm that RaycastHit2D.distance gives incorrect results. And I think it’s a bug.

RaycastHit2D.point gives a correct hit point. Hence, a reliable way to obtain the correct distance is:

float distance = Vector2.Distance( raycast2D.point, transform.position );

or

float distance = ( raycast2D.point - (Vector2) transform.position ).magnitude;

Hope this helps.

4

This was driving me insane, but I figured it out. RaycastHit2D.fraction returns the number I was expecting (the collision point).

5

I ran into a very similar problem and finally discovered that Raycast2D appears to be sensitive to the Transform scale in which you are running it. In my case, a parent object was set to Scale 0.5, making my collision detection appear to happen at half the distance it should.

At least something to check if you’re facing similar issues.

3

I can confirm that RaycastHit2D.distance (down) returns wrong value.