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[VR] Making HMD go black when the player look through a wall

Hello everyone!

I’m fairly new to UE4, and I am trying to Make a simple mechanic on the HTC Vive: I want the screen to go black when the player try to look through a wall.

To achieve this, as i understood that the Motion_controller_pawn was not exactly moving in the play area, I made a HMD_collision_box that follow the player camera position.

https://forums.unrealengine.com/core/image/gif;base64
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The first problem is that the HMD_collision_box come back to its original position between each tick. Do you have any idea about how i can avoid that?

Next, i used a trick to make the screen black: I made a second camera in the Motion_controller_pawn, with a black plane just in front of it.

I created a Blackout_box which is just a collision box made to determine the forbidden areas.

when the HMD_collision_Box overlap the Blackout_Box , the HMD view is switched to the second camera and the screen goes black.

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Well this doesn’t even work, i did found earlier a dirty way to do that but it was also going black when the controllers overlaped the blackout_box, and i want the HMD only to trigger this.

Do you have any idea?

Thank you very much!

I suggest post processing volumes. It is time consuming to setup on each object, but it works well and it’s the best I can offer at this point.