AI Perception can see through walls

Development Programming & Scripting AI
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1

I’m working on a topdown 2D game and I have some AI behavior setup after following the Advanced AI Twitch training video. I’ve rotated all the sprites to align with the XY axes so I could utilize the navmesh for the AI. Everything has worked really well except the AI can perceive the Player through walls. I’ve turned on AI debugging so I can see where the perception extends through the wall. I can inch the player into the AI perception a little without being spotted, but if I move the player fully into the cone of vision he is seen.

Initially I thought it might be a Paper2D issue, but I replaced all the wall sprites with very large cube meshes and it did not make a difference. The AI can still see through the cubes. I’m new to Unreal so I might be missing something, but it seems like a bug.

[EDIT]
I tried reproducing the problem in the 3D topdown template and couldn’t so it most likely has something to do with Paper2D.

2

Hi ryantowell,

Could you provide a small test project so we can test this issue in-house? If it’s smaller than 5 MBs you can upload it here or post a link to download it from Google Drive, Dropbox, etc.

3

I believe it’s all here. Let me know if you need more.

4

Thank you for the project. It looks like the AI Perception can see through any collision that is set to ‘BlockAllDynamic’.

To fix this:

  • Open the Wall blueprint

  • Select the Cube component

  • Then under the Details panel > Collision > Collision Preset

  • Change it to ‘BlockAll’

Let me know if that works for you.

Cheers,

TJ

5

Well, I feel silly. That fixed it. I removed the cube and set the sprite to “BlockAll” also and it worked also. Thanks for helping!