diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1a2b8a0..f34f827 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,9 @@
 # 0.9.0
 - Adding a rectangle alongside an existing room/wall will now preserve the interior wall.
 - Adding a door within an interior wall will now split the interior wall.
-- Add interior shadow on all exterior walls, interior walls, and doors.
-- Reorganize floor/shadow/wall render and graphics objects for better layering and to fix some visual artifacts.
+- Draw interior shadows for on all exterior walls, interior walls, and doors.
+- Reorganize floor/shadow/wall render and graphics objects for better layering and to fix some shadow overlap issues.
+- Fix code typo causing render errors.
 
 # 0.8.0
 - Allow Trusted Players to use Dungeon Draw tools. NOTE: updating lighting walls and scene settings still needs GM permissions. You may also need to give Trusted Player owner permissions to GM-created dungeon Journal Entries to allow editing.
diff --git a/scripts/dungeon.js b/scripts/dungeon.js
index db20cf9..2d9e6ed 100644
--- a/scripts/dungeon.js
+++ b/scripts/dungeon.js
@@ -151,10 +151,14 @@ export class Dungeon extends PlaceableObject {
         wallsToDelete.push(wall);
         // TODO: how should we handle coordinate ordering? Does JTS do this for us?
         // TODO: apparently not, and we have to do the reordering ourselves
-        const wallCoords = wallPoly.getCoordinates();
-        const doorCoords = doorPoly.getCoordinates();
-        wallsToAdd.push([wallCoords[0].x, wallCoords[0].y, doorCoords[0].x, doorCoords[0].y]);
-        wallsToAdd.push([doorCoords[1].x, doorCoords[1].y, wallCoords[1].x, wallCoords[1].y]);
+
+        const w1 = geo.lesserPoint(wall[0], wall[1], wall[2], wall[3]);
+        const w2 = geo.greaterPoint(wall[0], wall[1], wall[2], wall[3]);
+        const d1 = geo.lesserPoint(x1, y1, x2, y2);
+        const d2 = geo.greaterPoint(x1, y1, x2, y2);
+
+        wallsToAdd.push([w1[0], w1[1], d1[0], d1[1]]);
+        wallsToAdd.push([d2[0], d2[1], w2[0], w2[1]]);
       }
     }
     newState.interiorWalls = newState.interiorWalls.filter(w => wallsToDelete.indexOf(w) === -1);
diff --git a/scripts/geo-utils.js b/scripts/geo-utils.js
index f818eea..045a706 100644
--- a/scripts/geo-utils.js
+++ b/scripts/geo-utils.js
@@ -73,4 +73,31 @@ export const inverseSlope = (slope) => {
 
 export const distanceBetweenPoints = (x1, y1, x2, y2) => {
   return Math.sqrt(Math.pow(x2 - x1, 2) + Math.pow(y2 - y1, 2));
-};
\ No newline at end of file
+};
+
+export const comparePoints = (x1, y1, x2, y2) => {
+  if (x1 < x2 || (x1 === x2 && y1 < y2)) {
+    // less than
+    return -1;
+  } else if (x1 === x2 && y1 === y2) {
+    // equal
+    return 0;
+  } else {
+    // greater than
+    return 1;
+  }
+};
+
+export const lesserPoint = (x1, y1, x2, y2) => {
+  if (comparePoints(x1, y1, x2, y2) === -1) {
+    return [x1, y1];
+  }
+  return [x2, y2];
+};
+
+export const greaterPoint = (x1, y1, x2, y2) => {
+  if (comparePoints(x1, y1, x2, y2) !== -1) {
+    return [x1, y1];
+  }
+  return [x2, y2];
+};