Hi! blueprint noob here 
I am trying to activate custom event in my AI character’s blueprint,
by triggering a trigger box in my level. (through level’s blueprint)
and of course, the trigger should be overlapped by game character.
so just like the screengrab that I attached,
I casted trigger box’s overlap event onto my AI character’s BP, and called custom event
that I wanted. Nevertheless, Casting is keep on failing.
What is the cause of this? Any help would be really appreciated. thanks!
Should it be connected to ‘overlapped actor’? ( not at a machine right now )
Still not working! thanks for the reply anyway.
Then it’s not a BP_Hankung.
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You could try to get the name of the Actor and / or Component that is overlapping with a Print String … just to be sure that it is a BP_Hankyung.
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Have you check if both the trigger box and your character has Generate Overlap Events set to true
,
and have your character’s collision object type to overlap with the trigger?
actor/component that is overlapping with trigger is my player character, not BP_Hankyung. Maybe I am using “casting” in a wrong way? BP_Hankyung is totally separated AI character, I just want it to run certain event when my player character overlaps with box trigger.
That’s been checked. thanks!
The Cast node only checks if the overlapping Actor is - indeed - BP_Hankyung and - in your case - will fail, because the Player Character is overlapping.
You need another way, another reference to communicate with your BP_Hankyung.
So, after overlapping you could do one of these:
- Get All Actors of BP_Hankyung class: Not the best solution to that, but it really depends on your needs.
- Create a reference to the BP_Hankyung directly in the Trigger Box actor
(Create a variable with type BP_Hankyung, make it instance editable, pick the actor in the scene) - Event dispatcher
- …
This video really helps to understand the communication between blueprints:
Blueprint Communications | Live Training | Unreal Engine - YouTube
(quite long but totally worth it … I have to re-watch it every now and then 
)
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wow! thanks for your detailed reply. as well as others who posted a reply. And I will definitely check that video. 