OnMouseExit() fires on programmatically generated mesh

Scripting
1

Hi everyone,
I hope this is the right section for my question!

I am working on a simple tilemap where the player can select individual tiles using the mouse. I have a script that programmatically generates the mesh with 4 vertices for each tile and another one that handles the mouse movement and inputs.

When the mouse is above a tile, a cubic game object which I call the “selectionMarker” is moved to the respective position to highlight the position. Here is the code that I use:

    /* get the current mouse coordinates */
    void OnMouseOver () {
        // find the tile that is selected by the mouse
        Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        RaycastHit hitInfo;

        // error: remove the selection marker
        if (!GetComponent<Collider> ().Raycast (ray, out hitInfo, Mathf.Infinity)) {
                selectionMarker.GetComponentInChildren<MeshRenderer>().enabled = false;
                return;
        }

        // convert the world coordinates to tile coordinates
        Vector3 correctedPoint = gameObject.transform.InverseTransformPoint(hitInfo.point);
        int x = Mathf.FloorToInt(correctedPoint.x / tileMap.tileSize);
        int z = Mathf.FloorToInt(correctedPoint.z / tileMap.tileSize);
        int mapX = x;
        int mapZ = tileMap.sizeZ - z - 1;
        lastCoordinates = new Vector2 (mapX,mapZ);

        // move the selection marker
        selectionMarker.transform.position = new Vector3(x * tileMap.tileSize, 0.1f, z * tileMap.tileSize);
        selectionMarker.GetComponentInChildren<MeshRenderer>().enabled = true;
    }

    /* no tile selected: remove the selection marker */
    void OnMouseExit() {
        selectionMarker.GetComponentInChildren<MeshRenderer>().enabled = false;
    }

For some reason this does not work properly: When I move the cursor over the border between two tiles, the marker pops up for a few milliseconds but immediately becomes invisible again. The OnMouseExit() function seems to get called while I am still above the grid.

How is this possible when there are absolutely no gaps between the tiles? I have read that the MouseOver functions depend on the collider of the game object the script is attached to. The mesh collider is set to the generated mesh with “meshCollider.sharedMesh=mesh;” in the beginning.

Could the reason be that the selection marker game object is moved below the cursor and this triggers the OnMouseExit() function for the tilemap?

2

Sorry, right after posting I found the solution myself: In fact the OnMouseExit() function was triggered because the selection marker game object had a box collider. I removed the collider and it worked like a charm.

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