EricHey, really enjoy the concept and execution here. License Building Helper is licensed under the GNU General Public license. If you use Building Helper in your mod, please state so in your credits. There should be marching broken lines around the triangles as shown. If you make a mistake, deselect by pressing Ctrl+D. After selecting all triangles and without deselecting or clicking anything else on the picture, click on the eye button of the alpha layer to hide it.