Uncaught TypeError: Cannot read property 'offset' of undefined

Attached is a screen shot of my component,

Here is the code

Code (JavaScript):

1.  
2. export class CamerFollowFilter extends ut.EntityFilter {
3.         node: ut.Core2D.TransformNode;
4.         position?: ut.Core2D.TransformLocalPosition;
5.         rotation?: ut.Core2D.TransformLocalRotation;
6.         scale?: ut.Core2D.TransformLocalScale;
7.         follow?:game.CameraFollow;
8.     }
9.  
10.     export class CamerFollowBehavior extends ut.ComponentBehaviour {
11.  
12.         data: CamerFollowFilter;
13.  
14.         intermediatePosition:Vector3;
15.         // ComponentBehaviour lifecycle events
16.         // uncomment any method you need
17.    
18.         // this method is called for each entity matching the NewBehaviourFilter signature, once when enabled
19.         OnEntityEnable():void
20.         {
21.        
22.             this.world.forEach([game.MovementData, ut.Core2D.TransformLocalPosition],(player, position)=>
23.                 {
24.                     let cameraPosition = new Vector3(this.data.position.position.x,this.data.position.position.y,this.data.position.position.z);
25.                     let targetPosition = new Vector3(position.position.x,position.position.y,position.position.z);
26.                     console.log("this.data.follow.offset " + this.data.follow.offset.x +  " " + this.data.follow.offset.y + " " + this.data.follow.offset.z);
27.                     //console.log("targetPosition " + targetPosition.x +  " " + targetPosition.y + " " + targetPosition.z);
28.                     this.data.follow.offset = cameraPosition.sub(targetPosition);
29.                     let offsetV = new Vector3(this.data.follow.offset.x,this.data.follow.offset.y,this.data.follow.offset.z);
30.                     this.intermediatePosition = targetPosition.add(offsetV);
31.                 });
32.          }
33. }

And here is the Error ( It crashes at the first console log)

tsc-emit.js:37 Uncaught TypeError: Cannot read property 'offset' of undefined
at tsc-emit.js:37
at World.forEach (runtime.js:127554)
at CamerFollow.OnEntityEnable (tsc-emit.js:34)
at bindings.js:1702
at main.js:52
at World.forEach (runtime.js:127554)
at CamerFollowFilter.game.CamerFollowFilter.ForEach (main.js:50)
at Object.<anonymous> (bindings.js:1691)
at Array.<anonymous> (runtime.js:976)
at _emscripten_asm_const_iiii (runtime.js:995)


Also a Follow up. . . . can I get the TransformPositionComponents from the Entity Referance on the CameraFollow Componenet? ( IE avoiding the this.world.foreach() call?)

 

I tried that, here is what happened

Code (JavaScript):

1. export class CamerFollowFilter extends ut.EntityFilter {
2.         node: ut.Core2D.TransformNode;
3.         follow:game.CameraFollow;
4.         position?: ut.Core2D.TransformLocalPosition;
5.         rotation?: ut.Core2D.TransformLocalRotation;
6.         scale?: ut.Core2D.TransformLocalScale;
7.        
8.     }

Error

Uncaught TypeError: Cannot read property 'position' of undefined
at tsc-emit.js:35
at World.forEach (runtime.js:127554)
at CamerFollow.OnEntityEnable (tsc-emit.js:34)
at bindings.js:1702
at main.js:52
at World.forEach (runtime.js:127560)
at CamerFollowFilter.game.CamerFollowFilter.ForEach (main.js:50)
at Object.<anonymous> (bindings.js:1691)
at Array.<anonymous> (runtime.js:976)
at _emscripten_asm_const_iiii (runtime.js:995)

 

Follow up . . . . I had to remove optional from position as well! Now it is working. . . . I was wondering what the ? meant seems like it was the culpret

 

Correction providing this filter

Code (JavaScript):

1.     export class CamerFollowFilter extends ut.EntityFilter {
2.         node: ut.Core2D.TransformNode;
3.         follow:game.CameraFollow;
4.         position: ut.Core2D.TransformLocalPosition;
5.         rotation?: ut.Core2D.TransformLocalRotation;
6.         scale?: ut.Core2D.TransformLocalScale;
7.      
8.     }

Seems to cause the class to be ignored entirely. The console logs don't fire anything

 

I found the problem. . . . I assumed the Transform family on the Generated camera had a
TransformLocalPosition already on it. . . .it did not. Live and learn