Object handle more than one method?

CooperStrike

I followed this tutorial from hololens academy. My question is, does an object (hologram) able to hold more than one method other than OnSelect()? If that so, does everything has to be fired using SendMessageUpwards()?

james_ashley

@CooperStrike ,

You can have more than one method and they can be called anything you like. Not just OnSelect. You can use SendMessage or SendMessageUpwards (these are Unity syntax, not HoloLens).

Is this what you were looking for?

James

CooperStrike

Thanks for the response, @james_ashley
I did try that. However, another issue arose.
My testing was simple, just to show a text from the object being gazed at (and trigger it with clicking) but now the ability to place the object to different location is not working (it can be moved but can't be placed again once 'grabbed').

Also, what is the difference of SendMessage and SendMessage upwards?

james_ashley

@CooperStrike,

SendMessageUpwards bubbles up to parent objects (while SendMessage doesn't). This can be handy if you have a complex gameobject with multiple clickable parts and just want the method on the top most gameobject to get called.

For the other, it sounds like the gazegesturemanager and/or gesturemanager is confused about what the second tap means you are trying to drop the object or trying to trigger your text.

If you are combining the 101E tutorial with the HoloToolkit (where the TapToPlace script is found) it could be even more confusing since they aren't totally compatible. In that case, you might have two GestureRecognizer gameobjects trying to detect the same tap. (Can't tell without seeing the code, though.)

CooperStrike

@james_ashley
So the setup is still similar (with small adjustments) from the one in academy.

• I have the World object (contains the 'GazeGestureManager')
• Inside that object, there are Stage object (this serves as the parent of all the holograms -- 'TapToPlace' is attached here)
• Inside stage, there are 3 holograms: The board, and two cubes. Now on these cubes I added a script to show text.

Now, the GazeGestureManager seems to recognize the show text method well but not the case for 'TapToPlace' one.
And I only have one GestureRecognizer

james_ashley

@CooperStrike,

Gotcha. The next step, then, is probably to put in debug breakpoints to see which method is intercepting your air tap. Also, definitely use SendMessageUpwards in a scenario like that (you have one tap handler on an ancestor and another on a child object, I believe).

James

CooperStrike

@james_ashley
I still can't figure it out. I can move the object but I can't put it back, it will stay forever in my grasp until I shut the system.
Is there by any chance you can make a very simple example showing how 2 methods work?

Much appreciated!

james_ashley

@CooperStrike,

Sadly, the 101E code no longer works for me. It's pretty old. Can you paste your two methods and I'll try to see if I can find any problems?

James

CooperStrike

@james_ashley Ok I used the code from the academy only with a minor change to the GazeGestureManager (since it has to call two methods).
So I will tell you which part that I have changed.

GazeGestureManager
// Send an OnSelect message to the focused object and its ancestors. if (FocusedObject != null) { FocusedObject.SendMessageUpwards("OnSelect"); }
Becomes:
if (FocusedObject != null) { FocusedObject.SendMessageUpwards("OnSelect"); FocusedObject.SendMessageUpwards("DisplayText"); }
CubeCommands
For this, I just changed the class name. it is actually the same with SphereCommands (from Academy). The difference is I remove the OnSelect() method here and add DisplayText() method
void DisplayText() { OnOff = !OnOff; if (OnOff) { ShowText.gameObject.SetActive(true); } else { ShowText.gameObject.SetActive(false); } }

TapToPlaceParent
This is the same code with one from academy, as you notice the OnSelect() method is shown here.

That's it. Really appreciate if you can figure out the issue

james_ashley

@CooperStrike,

I got a version of this working, finally. My best guess is that when the OnSelect method, is called, the stage object is picked up and moves around with your gaze, but you no longer have an object as the focus. Then when you try to do the second airtap, since nothing has focus, the second OnSelect can't find its receiver. I discovered this by adding an extra line to the GazeGestureManager:

                Debug.Log("focused object: " + FocusedObject.name);
                FocusedObject.SendMessageUpwards("OnSelect");
                FocusedObject.SendMessageUpwards("DisplayText");

The work around would be to either add some sort of mesh collider to the stage object itself, so it can be the focus of a gaze, or make the colliders for your two object much bigger.

CooperStrike

@james_ashley Ok, going to try this.
Will update you with the result.
Thanks man