How to make Physic Raycaster Take Precedence over Graphic Raycaster?

Essentially, I've got a drag and drop functionality that modifies my player object's velocity toward the cursor on drag movements. I've even got a check so that if your mouse leaves the screen (or finger on mobile) that it continues to move toward the last known good point.

Unfortunately, I still cannot get it to move around my UI objects.

The linked video demonstrates the issue.

Drag Controls

Code (csharp):

1.  
2. public class playerMovementController : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler{
3.  
4.     private RaycastResult lastGoodRaycast;
5.  
6.     public void OnBeginDrag(PointerEventData data)
7.     {
8.         PlayerController.Singleton.StartAdjustingVelocity ();
9.         lastGoodRaycast = data.pointerCurrentRaycast;
10.     }
11.  
12.     public void OnDrag(PointerEventData data)
13.     {
14.         // Send last good raycast from data.  Only update if current raycast is good
15.         if (data.pointerCurrentRaycast.isValid) {
16.             lastGoodRaycast = data.pointerCurrentRaycast;
17.         }
18.             Vector3 velocityData = new Vector3 (lastGoodRaycast.worldPosition.x, 0.0f, lastGoodRaycast.worldPosition.z);
19.             PlayerController.Singleton.SetVelocityDataFromDrag (velocityData);
20.     }
21.  
22.     public void OnEndDrag(PointerEventData data)
23.     {
24.         PlayerController.Singleton.StopAdjustingVelocity ();
25.     }
26. }
27.  

Player Controls (pertinent code)

Code (csharp):

1.  
2.     void FixedUpdate () {
3.         if (updateVelocity && (Vector3.Distance(velocityDataFromDrag, rb.position) > touchMargin)) {    // Only update if touch distance is sufficient distance... prevents stuttering
4.             Vector3 moveTowardValue = velocityDataFromDrag - rb.position;
5.             moveTowardValue.y = 0.0f;
6.             moveTowardValue.Normalize ();
7.  
8.             rb.velocity = moveTowardValue * Time.deltaTime * movementSpeed;
9.  }
10.  

 

Not sure about precedence, but are you asking (or would it satisfy your question) , if your drag ignored UI raycasts?

 

It would. But the top left " . . ." is actually a button, so I don't think I can jut remove it as a raycast target, or set it to the Ignore Raycast layer...

 

What I meant was if the pointerCurrentRaycast 's layer is the UI, then you do not set it as a valid target? (ie: last good raycast)
Does that sound like it could work?
I'm not talking about making it invalid for everything, just your script

 

Absolutely what I need!

 

Which object, out of curiousity, is this script on?

 

An empty transform with a "Quad" mesh collider, scaled up to fit my game screen. Nothing attached to it but the collider and the playerMovementControl code to detect dragging.

 

So, I did a bit of testing (had some issue with getting a sprite to register my interfaces lol -- forgot the collider!)

Anyways, so this is what I was thinking:

Code (csharp):

1.  
2. Vector3 validPos = Vector3.zero;
3.     public void OnDrag(PointerEventData data)
4.     {
5.         // Send last good raycast from data.  Only update if current raycast is good
6.         if (data.pointerCurrentRaycast.isValid)
7.         {
8.             if (data.pointerCurrentRaycast.gameObject.layer == LayerMask.NameToLayer("UI"))
9.             {
10.                 validPos = data.position;
11.                 print("valid pos = " + validPos);
12.             }
13.             else
14.             {
15.                 print("Was valid: " + data.position);
16.                 lastGoodRaycast = data.pointerCurrentRaycast;
17.             }
18.         }
19.         else print("Wasn't valid?");
20.  

I didn't add back in your specific things (obviously I didn't have access to your methods), but does that kind of give you an idea? For me, when I go over a button and I'm dragging, I still get the world position.
If I'm dragging near the very top left corner and not on the button, I might have position x = 20, then I move slightly and I'm over the button, and I get '22'.
However, I then realize that it doesn't even matter about the UI layer! hahaha.

I think you were using a deprecated 'worldPosition' property on the raycast result. I just used the position of the pointer event, instead.
So, you could safely just remove that UI portion, but if you ever wanted some UI layer aware code, that might be one way to do it! lol

 

data.position is a Vector2 screen position, whereas I'm doing everything by Vector3 world position. All of the Camera.main functions to convert to world space require a Vector3, so how would I go about translating?

 

Sorry... you're right. Well, instead of talking through those conversions (which is an option), I there's another one:

Code (csharp):

1.  
2. if (data.pointerCurrentRaycast.gameObject.layer == LayerMask.NameToLayer("UI"))
3. {
4.      // this doesn't have to be made 'new' if you move it.
5.    List<RaycastResult> rcr = new List<RaycastResult>(10);
6.    EventSystem.current.RaycastAll(data, rcr);
7.    bool found = false;
8.    for(int i = 0; i < rcr.Count; ++i)
9.    {
10.       if (rcr[i].gameObject.layer == LayerMask.NameToLayer("UI")) continue;
11.       validPos = rcr[i].worldPosition;
12.        found = true; break;
13.      }
14.     if (found)
15.     {
16.         print("valid pos = " + validPos); // this was set in the loop.
17.     }
18.    else print("No valid hits."); // don't even think you can get here lol
19.  

Something like that? Only do the additional raycast (all) fetch, if you're over the UI ?

 

Ah! True, didn't even think about RaycastAll. Touche!

 

Hope it works well for ya.

 

Probably a bit too late, but you can also capture drag events on UI elements from GraphicRaycaster and relay them directly to the script capturing drag events using Physics2DRaycaster. This will effectively ignore UI.