diff --git a/GDJS/GDJS/Events/CodeGeneration/ObjectCodeGenerator.cpp b/GDJS/GDJS/Events/CodeGeneration/ObjectCodeGenerator.cpp
index 109c78fc7199..1a195775a98e 100644
--- a/GDJS/GDJS/Events/CodeGeneration/ObjectCodeGenerator.cpp
+++ b/GDJS/GDJS/Events/CodeGeneration/ObjectCodeGenerator.cpp
@@ -79,7 +79,7 @@ gd::String ObjectCodeGenerator::GenerateRuntimeObjectCompleteCode(
                   *eventsFunction,
                   methodCodeNamespace,
                   methodFullyQualifiedName,
-                  "that._onceTriggers",
+                  "runtimeScene.getOnceTriggers()",
                   functionName == doStepPreEventsFunctionName
                       ? GenerateDoStepPreEventsPreludeCode(eventsBasedObject)
                       : "",
@@ -208,7 +208,6 @@ CODE_NAMESPACE.RUNTIME_OBJECT_CLASSNAME = class RUNTIME_OBJECT_CLASSNAME extends
     super(parentInstanceContainer, objectData, instanceData);
     this._parentInstanceContainer = parentInstanceContainer;
 
-    this._onceTriggers = new gdjs.OnceTriggers();
     this._objectData = {};
     INITIALIZE_PROPERTIES_CODE
     INITIALIZE_ANIMATABLE_CODE
@@ -360,7 +359,7 @@ CODE_NAMESPACE.RUNTIME_OBJECT_CLASSNAME.prototype.doStepPreEvents = function() {
 gd::String ObjectCodeGenerator::GenerateDoStepPreEventsPreludeCode(
     const gd::EventsBasedObject& eventsBasedObject) {
   gd::String doStepPreEventsPreludeCode;
-  doStepPreEventsPreludeCode += "this._onceTriggers.startNewFrame();";
+  doStepPreEventsPreludeCode += "this._instanceContainer.getOnceTriggers().startNewFrame();";
   if (eventsBasedObject.IsAnimatable()) {
     doStepPreEventsPreludeCode +=
         "\nthis._animator.step(this.getElapsedTime() / 1000);";
diff --git a/GDJS/Runtime/CustomRuntimeObjectInstanceContainer.ts b/GDJS/Runtime/CustomRuntimeObjectInstanceContainer.ts
index 5860ce866d51..94baa56ef765 100644
--- a/GDJS/Runtime/CustomRuntimeObjectInstanceContainer.ts
+++ b/GDJS/Runtime/CustomRuntimeObjectInstanceContainer.ts
@@ -394,11 +394,19 @@ namespace gdjs {
     }
 
     getViewportOriginX(): float {
-      return this._customObject.getUnscaledCenterX();
+      // We don't use `getUnscaledCenterX` because of custom center.
+      return (
+        this._customObject.getInnerAreaMinX() +
+        this._customObject.getInnerAreaMaxX()
+      ) / 2;
     }
 
     getViewportOriginY(): float {
-      return this._customObject.getUnscaledCenterY();
+      // We don't use `getUnscaledCenterY` because of custom center.
+      return (
+        this._customObject.getInnerAreaMinY() +
+        this._customObject.getInnerAreaMaxY()
+      ) / 2;
     }
 
     onChildrenLocationChanged(): void {
diff --git a/GDJS/Runtime/RuntimeCustomObjectLayer.ts b/GDJS/Runtime/RuntimeCustomObjectLayer.ts
index 0f2e3374f99a..02442911f28e 100644
--- a/GDJS/Runtime/RuntimeCustomObjectLayer.ts
+++ b/GDJS/Runtime/RuntimeCustomObjectLayer.ts
@@ -10,6 +10,9 @@ namespace gdjs {
    * @category Core Engine > Layers
    */
   export class RuntimeCustomObjectLayer extends gdjs.RuntimeLayer {
+    private _cameraDeltaX: float = 0;
+    private _cameraDeltaY: float = 0;
+
     /**
      * @param layerData The data used to initialize the layer
      * @param instanceContainer The container in which the layer is used
@@ -22,6 +25,7 @@ namespace gdjs {
 
       // Let the renderer do its final set up:
       this._renderer.onCreated();
+      this._renderer.updatePosition();
     }
 
     override onGameResolutionResized(
@@ -30,23 +34,29 @@ namespace gdjs {
     ): void {}
 
     override getCameraX(cameraId?: integer): float {
-      return 0;
+      return this._cameraDeltaX + this._runtimeScene.getViewportOriginX();
     }
 
     override getCameraY(cameraId?: integer): float {
-      return 0;
+      return this._cameraDeltaY + this._runtimeScene.getViewportOriginY();
     }
 
-    override setCameraX(x: float, cameraId?: integer): void {}
+    override setCameraX(x: float, cameraId?: integer): void {
+      this._cameraDeltaX = x - this._runtimeScene.getViewportOriginX();
+      this._renderer.updatePosition();
+    }
 
-    override setCameraY(y: float, cameraId?: integer): void {}
+    override setCameraY(y: float, cameraId?: integer): void {
+      this._cameraDeltaY = y - this._runtimeScene.getViewportOriginY();
+      this._renderer.updatePosition();
+    }
 
     override getCameraWidth(cameraId?: integer): float {
-      return 0;
+      return this.getWidth();
     }
 
     override getCameraHeight(cameraId?: integer): float {
-      return 0;
+      return this.getHeight();
     }
 
     override setCameraZoom(newZoom: float, cameraId?: integer): void {}
@@ -121,9 +131,15 @@ namespace gdjs {
       cameraId: integer,
       result: FloatPoint
     ): FloatPoint {
+      // The result parameter used to be optional.
+      let position = result || [0, 0];
+
+      x += this._cameraDeltaX;
+      y += this._cameraDeltaY;
+
       // TODO EBO use an AffineTransformation to avoid chained calls.
       // The result parameter used to be optional.
-      return this._runtimeScene.convertCoords(x, y, result || [0, 0]);
+      return this._runtimeScene.convertCoords(x, y, position);
     }
 
     override convertInverseCoords(
@@ -132,9 +148,16 @@ namespace gdjs {
       cameraId: integer,
       result: FloatPoint
     ): FloatPoint {
+      // The result parameter used to be optional.
+      let position = result || [0, 0];
+
       // TODO EBO use an AffineTransformation to avoid chained calls.
       // The result parameter used to be optional.
-      return this._runtimeScene.convertInverseCoords(x, y, result || [0, 0]);
+      this._runtimeScene.convertInverseCoords(x, y, position);
+      position[0] -= this._cameraDeltaX;
+      position[1] -= this._cameraDeltaY;
+
+      return position;
     }
 
     override applyLayerInverseTransformation(
@@ -143,8 +166,8 @@ namespace gdjs {
       cameraId: integer,
       result: FloatPoint
     ): FloatPoint {
-      result[0] = x;
-      result[1] = y;
+      result[0] = x - this._cameraDeltaX;
+      result[1] = y - this._cameraDeltaY;
       return result;
     }
 
@@ -154,8 +177,8 @@ namespace gdjs {
       cameraId: integer,
       result: FloatPoint
     ): FloatPoint {
-      result[0] = x;
-      result[1] = y;
+      result[0] = x + this._cameraDeltaX;
+      result[1] = y + this._cameraDeltaY;
       return result;
     }
   }
diff --git a/GDJS/Runtime/RuntimeInstanceContainer.ts b/GDJS/Runtime/RuntimeInstanceContainer.ts
index 5a70e9cd2bcf..88fec20e0f29 100644
--- a/GDJS/Runtime/RuntimeInstanceContainer.ts
+++ b/GDJS/Runtime/RuntimeInstanceContainer.ts
@@ -56,6 +56,8 @@ namespace gdjs {
     _debugDrawShowPointsNames: boolean = false;
     _debugDrawShowCustomPoints: boolean = false;
 
+    _onceTriggers: OnceTriggers;
+
     /**
      * @param runtimeGame The game associated to this scene.
      */
@@ -71,6 +73,7 @@ namespace gdjs {
         // Register an UnknownRuntimeObject to use when the object doesn't exist.
         this.registerObject(unknownObjectData);
       }
+      this._onceTriggers = new gdjs.OnceTriggers();
     }
 
     /**
@@ -842,6 +845,13 @@ namespace gdjs {
       }
     }
 
+    /**
+     * Get the structure containing the triggers for "Trigger once" conditions.
+     */
+    getOnceTriggers() {
+      return this._onceTriggers;
+    }
+
     /**
      * Clear any data structures to make sure memory is freed as soon as
      * possible.
@@ -859,6 +869,8 @@ namespace gdjs {
       this._instancesRemoved = [];
       this._layersCameraCoordinates = {};
       this._initialBehaviorSharedData = new Hashtable();
+      // @ts-ignore We are deleting the object
+      this._onceTriggers = null;
     }
   }
 }
diff --git a/GDJS/Runtime/runtimescene.ts b/GDJS/Runtime/runtimescene.ts
index a4e6a63aa011..acf90459a3e2 100644
--- a/GDJS/Runtime/runtimescene.ts
+++ b/GDJS/Runtime/runtimescene.ts
@@ -45,7 +45,6 @@ namespace gdjs {
     /** Should the canvas be cleared before this scene rendering. */
     _clearCanvas: boolean = true;
 
-    _onceTriggers: OnceTriggers;
     _profiler: gdjs.Profiler | null = null;
 
     // Set to `new gdjs.Profiler()` to have profiling done on the scene.
@@ -74,7 +73,6 @@ namespace gdjs {
         gdjs.VariablesContainer
       >();
       this._timeManager = new gdjs.TimeManager();
-      this._onceTriggers = new gdjs.OnceTriggers();
       this._requestedChange = SceneChangeRequest.CONTINUE;
       this._cachedGameResolutionWidth = runtimeGame
         ? runtimeGame.getGameResolutionWidth()
@@ -345,8 +343,6 @@ namespace gdjs {
       this._eventsFunction = null;
       this._lastId = 0;
       this.networkId = null;
-      // @ts-ignore We are deleting the object
-      this._onceTriggers = null;
     }
 
     /**
@@ -819,13 +815,6 @@ namespace gdjs {
       }
     }
 
-    /**
-     * Get the structure containing the triggers for "Trigger once" conditions.
-     */
-    getOnceTriggers() {
-      return this._onceTriggers;
-    }
-
     /**
      * Check if the scene was just resumed.
      * This is true during the first frame after the scene has been unpaused.
diff --git a/GDJS/tests/tests-utils/MockedCustomObject.js b/GDJS/tests/tests-utils/MockedCustomObject.js
index 2b37f50a585e..9e62d7899a7b 100644
--- a/GDJS/tests/tests-utils/MockedCustomObject.js
+++ b/GDJS/tests/tests-utils/MockedCustomObject.js
@@ -8,7 +8,6 @@ gdjs.evtsExt__MyExtension__MyCustomObject.MyCustomObject = class MyCustomObject
     super(parentInstanceContainer, objectData);
     this._parentInstanceContainer = parentInstanceContainer;
 
-    this._onceTriggers = new gdjs.OnceTriggers();
     this._objectData = {};
     
     this._objectData.MyProperty = objectData.content.MyProperty !== undefined ? objectData.content.MyProperty : Number("123") || 0;