diff --git a/src/lib/map/MapDoodadDef.ts b/src/lib/map/MapDoodadDef.ts
index 22df447..57b1c15 100644
--- a/src/lib/map/MapDoodadDef.ts
+++ b/src/lib/map/MapDoodadDef.ts
@@ -1,16 +1,38 @@
+import { MAP_CORNER_X, MAP_CORNER_Y } from './const.js';
+
 class MapDoodadDef {
   #name: string;
   #id: number;
   #position: Float32Array;
+  #mapPosition: Float32Array;
   #rotation: Float32Array;
+  #mapRotation: Float32Array;
   #scale: number;
 
-  constructor(name, id, position, rotation, scale) {
+  constructor(
+    name: string,
+    id: number,
+    position: Float32Array,
+    rotation: Float32Array,
+    scale: number,
+  ) {
     this.#name = name;
     this.#id = id;
     this.#position = position;
     this.#rotation = rotation;
     this.#scale = scale;
+
+    // Doodad defs (map placements) are stored in a Y-up right-handed coordinate system
+
+    this.#mapPosition = new Float32Array(3);
+    this.#mapPosition[0] = MAP_CORNER_X - position[2];
+    this.#mapPosition[1] = MAP_CORNER_Y - position[0];
+    this.#mapPosition[2] = position[1];
+
+    this.#mapRotation = new Float32Array(3);
+    this.#mapRotation[0] = rotation[2];
+    this.#mapRotation[1] = rotation[0];
+    this.#mapRotation[2] = rotation[1];
   }
 
   get name() {
@@ -25,10 +47,18 @@ class MapDoodadDef {
     return this.#position;
   }
 
+  get mapPosition() {
+    return this.#mapPosition;
+  }
+
   get rotation() {
     return this.#rotation;
   }
 
+  get mapRotation() {
+    return this.#mapRotation;
+  }
+
   get scale() {
     return this.#scale;
   }