Question CompositeCollider.OverlapPoint returns false when it should be true

I have a tilemap that uses an outline composite and I want to know if a rigidbody is inside the collider or not. here is the code I use:

Code (CSharp):

1. ground.GetComponent<CompositeCollider2D>().OverlapPoint(body.position)

this always returns false even when I can see that it should return true. When I use this code:

Code (CSharp):

1.  
2. Debug.Log(ground.GetComponent<CompositeCollider2D>().bounds + " | " + body.position);
3. Debug.Log(ground.GetComponent<CompositeCollider2D>().bounds.Contains(body.position));
4. Debug.Log(ground.GetComponent<CompositeCollider2D>().OverlapPoint(body.position));

It returns

so I know that the body is inside the tilemap, but I can't use bounding box for the main code as the tilemap isn't a perfect square (there are holes for example) so the function will return false trues.

Does anyone know what caused this problem and have any potential solutions?
Thanks!

 

Physics2D.OverlapBox not working on Composite Colliders - Unity Forum

Try setting the Geometry Type to Polygons instead.

 

Just want to give some insight. Do NOT use polygon if your tilemap is used as ground for the player. You will get ghost collisions. I see people recommending it as a fix, but they don’t realize it will cause this issue.

 

Those aren't 'ghost collisions'. They're just collisions.
If you have the collider set to Outline, there is no 'inside' for the collider. If you've set it to Polygon, there is.
So for Outline there are no collisions 'inside' the collider, and for Polygon there are.

 

I need an object with collision to be able to move freely inside it, so I can't set it to polygon. If overlap point won't work, is there another way to see if a point is inside a composite collider?

 

Unfortunately, this is not true. You just have to google to find out the answer: https://forum.unity.com/threads/composite-collider-2d-ghost-collision.923417/#post-6043406

Please read this bit:

"Ghost collisions don't occur when moving across a continuous surface. This is only provided by edge-chains so EdgeCollider2D or CompositeCollider2D to set Outline mode (which produces edge-chains). This is the shape type in Box2D used when using the edge or composite in outline mode.

If you're using polygon mode then you're still producing multiple physics shapes which are not a continuous surface and are no different than multiple colliders."

 

Bounds, like you already used.
Or perhaps you can change it to polygon, do your OverlapPoint, then change it back?

 

changing to polygon and back would cause a bunch of lag as physics has to be done as if its a polygon, and this function is run every frame so it would kill the game completely.

Like I said above, bounds also don't work as they are only rectangles, not complex shapes, so it would return a bunch of false positives.

I also tried using raycasts that point in all four directions to see if there is the collider on all four sides, and then returning true if there is, but this didn't work when in a cave in the tilemap where there are walls on all four sides (again returning false positives).

If anyone knows any other potential solutions, please let me know, I'd love to at least give them a go!

 

You could duplicate your tilemap, add the polygon collider, remove the renderer and other components you don't need, and just use that for testing. (Set it to isTrigger) of course.

 

I need this to work for the main game so hopefully something more efficient would be available. I guess having two colliders on the tilemap would work though