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CocosCreator 3.2 Touch to Local co-ordinates 2D

There could be scenarios where you would want to understand the position of touch within the local co-ordinate system of a 2D node. Use-cases where this is useful
  • Moving sprites within a confined location
  • Virtual JoyStick implementation. 

So in 3.2, you first need to convert the screen coordinates to 3D coordinates then convert the 3D world co-ordinate to the Local Co-ordinate of the node. This can be done as follows. 

//in touch callback.
    let touchLoc = event.getLocation()     let screenTouchLoc = v3(touchLoc.x, touchLoc.y, 0)
      let screen2World = this.stageCamera.screenToWorld(screenTouchLoc)
      let uitComponent = this.node.getComponent(UITransform)?
        let touchLocInNode = uitComponent.convertToNodeSpaceAR(screen2World)

The above has helped me fix a broken virtual joystick script to get my character moving :)  

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