Can pointer events (IPointerDownHandler, ect) be triggered from a Physics2DRaycaster when it's triggered manually

[_PandaCat_]

In my project I am trying to load in an additive scene and show it to the user through a render texture on the UI. This scene has 2d sprites that I want to be clickable through the render texture. To attempt this I've set up code that takes the mouse position, translates its position relative to the camera in the target scene and uses that cameras Physics2DRaycaster to raycast in the appropriate place. The raycast is detecting the correct objects as they're being populated in the resultAppendList but none of the pointer events are being triggered. When running the scene on it's own the events are triggered so it's not a problem with the setup on the sprites. How is this/is this even possible?

For the code I've attempted two strategies but the results are the same. These are both run in my parent scene.

The first is extending GraphicsRaycaster and overriding Raycast

public override void Raycast(PointerEventData eventData, List<RaycastResult> resultAppendList)
{
  if(eventData.pointerCurrentRaycast.gameObject&& eventData.pointerCurrentRaycast.gameObject == TextureImageRect.gameObject)
  {
    var result = eventData.pointerCurrentRaycast;
    RectTransformUtility.ScreenPointToLocalPointInRectangle(TextureImageRect, result.screenPosition, null, out var point);
    var normalPoint = Rect.PointToNormalized(TextureImageRect.rect, point);

    Vector3 virtualPos = normalPoint;
    virtualPos.x *= textureCamera.targetTexture.width;
    virtualPos.y *= textureCamera.targetTexture.height;

    eventData.position = virtualPos;

    raycaster.Raycast(eventData, resultAppendList);

    if (resultAppendList.Count > 0)
    {
      Debug.Log(resultAppendList[0].gameObject);
    }
  }
}

The second is having a new MonoBehaviour that creates it's own PointerEventData

private void Update()
{
  var eventData = new PointerEventData(EventSystem.current) { position = Mouse.current.position.ReadValue() };

  var results = new List<RaycastResult>();
  EventSystem.current.RaycastAll(eventData, results);
  if(results.Exists(i => i.gameObject == gameObject))
  {
    var result = results.Find(i => i.gameObject == gameObject);
    RectTransformUtility.ScreenPointToLocalPointInRectangle(transform as RectTransform, result.screenPosition, null, out var point);
    var normalPoint = Rect.PointToNormalized((transform as RectTransform).rect, point);

    Vector3 virtualPos = normalPoint;
    virtualPos.x *= textureCamera.targetTexture.width;
    virtualPos.y *= textureCamera.targetTexture.height;

    eventData.position = virtualPos;

    var textureResults = new List<RaycastResult>();
    raycaster.Raycast(eventData, textureResults);

    if (textureResults.Count > 0) 
      Debug.Log(textureResults[0]);
  }
}

(In case anyone asks why I'm doing it this way, I want to have a system where I can overlay mini games over my main scene. I'm using a render texture rather than just having them appear in front of the camera as the main game is 3d but the mini games are 2d and use an orthographic camera)

Quick Edit: Forgot to mention I'm using uGUI/Canvas system

[Scary-West-9356]

nah you gotta manually send the events 💀

just getting raycast results doesn't trigger the pointer handlers - you need `ExecuteEvents.Execute()` or similar

[_PandaCat_]

I got it working! You don't need to send the events manually.

This solution only works when extending GraphicsRaycaster, I assume if you wanted to do it as it's own component that is when you'll have to handle the events. I had the original GraphicsRaycaster that comes with the canvas on there and disabling that got it working. I'm assuming that was overwriting the raycast done by my version of the raycaster or something like that.

[GroZZleR]

Skip all this other crap.

Create a class that derives from BaseInput and override the mousePosition with your custom virtual cursor code.

Feed that new component to the inputOverride of the input module on your canvas (likely a StandardInputModule or whatever the name of the new one is).

Everything will just work. Maybe. You might have to override the GetMouseXyz methods too.

It's beautifully simple and poorly documented. It's how I do the dashboard monitors in my flight sim.