Update BuildingShapeUtils.js

Author: Beakerboy

src/extras/BuildingShapeUtils.js

@@ -288,8 +288,8 @@ class BuildingShapeUtils extends ShapeUtils {
     p1 = points[0];
     p2 = points[1];
     angles.push(Math.atan((p2.y - p1.y) / (p2.x - p1.x)) - Math.atan((p0.y - p1.y) / (p0.x - p1.x)));
-    for (let i = 1; i < points.length - 1; i++) {
-      p0 = points[i-1];
+    for (let i = 1; i < points.length - 2; i++) {
+      p0 = points[i - 1];
       p1 = points[i];
       p2 = points[i + 1];
       angles.push(Math.atan((p2.y - p1.y) / (p2.x - p1.x)) - Math.atan((p0.y - p1.y) / (p0.x - p1.x)));