Physics.Raycast not hitting anything

For some reason my Physics.Raycast isn't hitting anything:

         Vector3 endPoint = Vector3.zero;
         for (int e = 0; e < mesh.vertices.Length; e++)
         {
             Vector3 StartPoint = mesh.normals[e] * (Radius + MaxHeight + 10.0f);
             RaycastHit hit;
             if (Physics.Raycast(endPoint, StartPoint, out hit))
             {
                 Debug.DrawLine(StartPoint, hit.point, Color.yellow);
                 Debug.DrawLine(hit.point, endPoint, Color.red);
                 colors[e] = new Color(0.5f, 0.5f, 0.5f, 1.0f);
             }
             else
             {
                 Debug.DrawLine(StartPoint, endPoint, Color.green, 5f);
             }
         }

I have tried with both a MeshCollider and a spherecollider and none of the rays turn either yellow or red, they remain green. Am I using it wrong?

EDIT: It seems that it doesn't hit because there isn't any collider, even though I have a meshcollider attached to it. I update my meshcollider like so:

         mesh.Clear();
         mesh.vertices = vert;
         mesh.normals = norm;
         mesh.triangles = tri;
         mesh.uv = uv;
 
         mesh.RecalculateBounds();
         mesh.RecalculateNormals();
 
         mc0.sharedMesh = null; // nullify the previous sharedMesh
         mc0.sharedMesh = mesh;
 
         mc0.enabled = false;
         mc0.enabled = true;