Hi. I have a little question. I made this playground to be more easy. http://www.babylonjs-playground.com/#L0CZY#2. I have a ground create from heightmap. And I want that, when i mouse drag on it, to draw a rectangle from starting mouse_down point to mouse_up point. It is possible? Thanks. I tryed something, but it draw just a line., or if u enable line 86, it draw a lot of triangles.