Sending Custom Events via the EvenSystem

CustomEvents.cs

using System;
using System.Collections.Generic;
using UnityEngine.Events;

// interface you implement in your MB to receive events
public interface ICustomHandler : IEventSystemHandler
{
	void OnCustomCode(CustomEventData eventData);
}

// Custom data we will send via the event system
public class CustomEventData : BaseEventData
{
	public string m_CustomData;

	public CustomEventData(EventSystem eventSystem, string customData)
		: base(eventSystem)
	{
		m_CustomData = customData;
	}
}

// container class that holds the execution logic
// called by the event system to delecate the call to
// the intercea
public static class MyCustomEvents
{
	// call that does the mapping
	private static void Execute(ICustomHandler handler, BaseEventData eventData)
	{
		// The ValidateEventData makes sure the passed event data is of the correct type
		handler.OnCustomCode (ExecuteEvents.ValidateEventData<CustomEventData> (eventData));
	}

	// helper to return the functor that should be invoked
	public static ExecuteEvents.EventFunction<ICustomHandler> customEventHandler
	{
		get { return Execute; }
	}
}

//Custom input module that can send the events
public class MyInputModule : BaseInputModule
{
	// list of objects to invoke on
	public GameObject[] m_TargetObjects;

	// called each tick on active input module
	public override void Process()
	{
		// if we don't have targets return
		if (m_TargetObjects == null || m_TargetObjects.Length == 0)
			return;

		// for each target invoke our custom event
		foreach (var target in m_TargetObjects)
			ExecuteEvents.Execute (target, new CustomEventData (eventSystem, "Custom Data"), MyCustomEvents.customEventHandler);
	}
}

// Class that implements the Handler
public class MyCustomMB : MonoBehaviour, ICustomHandler
{
	public void OnCustomCode(CustomEventData eventData)
	{
		Debug.Log (eventData.m_CustomData);
	}
}

Thanks, this helped a lot! Look for "3D EventTrigger", or whatever I decide to call it, on the asset store (probably free) in a few weeks!