Name: Interaction & Door Key System in Unreal Engine 5 | Horror Escape Game - Part 7 | Beginner Friendly
Uploaded: 2026-02-13 12:30:00
Duration: 12 min 4 s

Question 1

How do I make a door open based on the player’s side in Unreal Engine 5?

Accepted Answer

In my door BP, I calculate the opening direction using a dot product between the player’s forward vector and the door’s forward vector. If the dot product is >= 0, I set the door Z rotation to 90, otherwise I set it to -90. This way the door opens in the same direction the player is approaching from, so you don’t get stuck when the ghost is chasing you.

Question 2

How do I create a key and locked door system for a horror game in UE5?

Accepted Answer

I use a door key system where each door has a door name, and keys match that name. The character blueprint interface contains CollectKey and UseKey logic, and when you interact with a locked door it checks if you have the right key. I also spawn keys into random drawers using the game mode so every run can feel different.

Question 3

How do I spawn a key in a random drawer in Unreal Engine?

Accepted Answer

In the game mode, I get all the drawer tables from the level and then pick a random drawer to spawn the key. I keep a key list in the game mode and select from that list when spawning. That’s why I tell you to implement the drawer/key spawning video first, then integrate it into the horror map.

Question 4

How do I highlight interactable objects with an outline in UE5?

Accepted Answer

I do it with a post-processing outline material, then I add a Post Process Volume and assign the outline material instance. In Project Settings, I enable Custom Depth Stencil Pass with Stencil. Inside my base interactable BP, on hover I set Render Custom Depth true and set a stencil value (like 2), and on unhover I reset it so the outline disappears.

Question 5

Why is my navmesh not updating when I unlock or open a door in UE5?

Accepted Answer

If you want the navmesh to change at runtime, you need to set the Recast NavMesh runtime generation to Dynamic. In my setup, I also prevent the door mesh from affecting navigation by unchecking “Can Ever Affect Navigation.” Then I control blocking using a Nav Modifier component instead of relying on the moving mesh.

Question 6

How do I block AI from entering a room until a door is unlocked?

Accepted Answer

I add a Nav Modifier component to the door and set its Area Class to Nav Area Null so it blocks navigation through that doorway. When the door is unlocked the first time, I switch the area class to Nav Area Default. That permanently opens the path for the ghost to move between rooms once the player has unlocked it.

Question 7

How do I make AI open doors when it hits them in Unreal Engine 5?

Accepted Answer

I enable “Simulate Generate Hit Events” on the door’s interactable mesh and use an OnHit event. On hit, I check if the other actor implements my ghost blueprint interface, then I confirm the door is unlocked and currently closed. If both are true, I call my Open Door event and pass the ghost as the character reference so it opens the door and keeps chasing.

Interaction & Door Key System in Unreal Engine 5 | Horror Escape Game - Part 7 | Beginner Friendly

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