Detecting a mouse click on a custom 2D mesh?

Questions & Answers
1

I have a 2D game core where I create trails using custom meshes. I want to be able to detect a click on this customly created mesh. I tried adding a MeshCollider and used an example code I found:

	if(Input.GetMouseButtonDown(0))
	{
		var ray = Camera.main.ScreenPointToRay(Input.mousePosition);
		RaycastHit hit;

		if(Physics.Raycast(ray, out hit))
			Debug.Log("Mouse Down Hit the following object: " + hit.collider.name);
		else
			Debug.Log ("Nothing was hit!");
	}

It seems to “sort of work”. I get an occasional hit from this, but the result seems really random.

Basically all I need is to see if my trail has been clicked, but at this point I’d be happy to get some insight into how I can visualize the shape the raycaster tests against.

[Update] Ok, so I found 2 issues with this:

  1. The normals were only correct for half the triangles. I changed the generation algorithm so now the normals are faced towards the camera. However, now it only works for the 1st quad being drawn which takes me to issue 2:

  2. The mesh collider isn’t being updated despite me calling mCollider.sharedMesh = mMesh; at the end of the update. I can update it manually by clicking any of the variables in the editor, such as IsConvex to on and off and it works splendidly after that. How do I do this refresh manually through code? This is my currect mesh construction code:

    void ConstructMesh()
    {
    mMesh.Clear();

     mMesh.vertices = vertices;
 mMesh.normals = normals;
 mMesh.triangles = triangles;
 mMesh.uv = uvs;

 mMesh.RecalculateNormals();
 mMesh.RecalculateBounds();
 mMesh.Optimize ();

 mCollider.sharedMesh = mMeshFilter.sharedMesh;

    }

2

Ok, so I figured out what the problem was. Since the sharedMesh is the same one that is originally set, setting it again doesn’t actually update the reference. What I needed to do here was to

	mCollider.sharedMesh = null;
	mCollider.sharedMesh = mMeshFilter.sharedMesh;

This refreshes it. It looks ugly, so if there is a “correct” way to do it, I’d appreciate getting to know it.