Why Object3D type not "Transform" field in Unity

🌵 Needle Engine
,
1 
  // this will be a "Transform" field in Unity
    @serializable(Object3D) 
    myObjectReference: Object3D | null = null;

https://engine.needle.tools/docs/scripting.html#serialization-components-in-gltf-files

2

image
image

3

If you want this to be a Transform you can annotate it with a comment like so:

//@type UnityEngine.Transform
@serializable(Object3D)
myTransform?: Object3D;

At runtime it will both be a Object3D

Also note that your second example is missing the Object3D in the @serializable: @serializable(Object3D) is required so that it results in the correct type. A GameObject and a Object3D are essentially the same - the GameObject type just exposes some more methods

4

How About Enum Show this in Unity

enum Direction {
    Up = 1,
    Down = 5,
    Left = 10,
    Right = 15
  }
  
export class GameManager extends Behaviour {
    dir: Direction = Direction.Left;
}
5

You can just declare it like this in your Needle component:

enum Direction = {
  Up = 1,
  Down = 5,
  Left = 10,
  Right = 15,
}

export class GameManager extends Behaviour {
  @serializable()
  dir: Direction = Direction.Left;
}

and in Unity make sure you have an enum with the name Direction in your C# code somewhere. Then it will be show up as an enum dropdown (we don’t automatically generate new C# enum types so you need to make sure that this type exists in Unity and it will be picked up by our compiler the next time it runs)