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Hit Events not triggered for Actor with Physics enabled

I have a very simple BP actor, with only one Destructible component, nothing else. That component has "Simulate Physics" flag on, as well as the "Simulation Generate Hit Events" flag. Collision preset is set to custom, with collision enabled for query and physics. It blocks the game map terrain.

Now in the game, when this actor is being spawned, it correctly falls down to the terrain and stops there, so collision is correctly detected. However, neither the "OnComponentHit" event of the component nor the generic "Event Hit" events are being triggered when that actor touches the ground.

Any ideas what I might be missing here?
Is this a bug or a feature?

Product Version: UE 4.12
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asked Aug 09 '16 at 12:05 PM in Bug Reports

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haimat
236 21 36 45

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2 answers: sort voted first

Is a feature... Both meshes need to have the flags activated in order to trigger the Hit event.

But if the problem persists try this:

Make the BP from a Static mesh placed on the map, like a cube, instead of making a simple BP actor. Maybe that could fix your problem, worked for me with the movement with keys.

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answered Aug 09 '16 at 01:35 PM

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Batrachus
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avatar image haimat Aug 09 '16 at 01:46 PM

Thanks for your reply. But I cannot set the flags on both meshes, as the other mesh is a landscape, and that has no such options as to generate hit events :(

avatar image TJ V ♦♦ STAFF Aug 09 '16 at 04:03 PM

Hi haimat,

Thank you for the report. I was able to reproduce this and have entered JIRA UE-34420 for the developers to investigate further.

As a workaround, you can enable Impact Damage on the Destructible mesh and it will register the hit on the landscape. However, you will have to set the mesh up to not fracture on the first hit if that is what you want.

If you need more info on how to set that up, check out this Destructible showcase from Tim Hobson.

Cheers,

TJ

avatar image haimat Aug 09 '16 at 04:51 PM

Thanks for the feedback!

avatar image loraptor Jan 11 '17 at 03:29 PM

This is still very much an issue. It seems like the OnComponentHit Event for Destructibles stopped triggering in 4.13

  • 4.11 - Working

  • 4.12.5 - Working

  • 4.13 - Broken

  • 4.14 - Broken

Very simple to test :

  1. Import any mesh

  2. Right Click -> Create Destructible

  3. Fracture

  4. Right Click DM -> Asset Actions - > Create Blueprint From This Asset

  5. Add OnComponentHitEvent(Destructible)

  6. Add Print String

  7. Turn on "Simulation Generates Hit Events" for both the DM Component and floor plane

  8. Turn on Simulate Physics for DM Component

  9. Simulate or Play

alt text

Can we get a word from Epic as to whether this is due to an actual issue/bug or whether the workflow for this has changed?

Thanks

dmhiteventbp.jpg (216.3 kB)
avatar image Ashgpt Jul 07 '17 at 02:59 PM

Apparently checking the Enable Impact Damage checkbox in the destructible settings allows the OnComponentHit event to be triggered.

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Hey, im struggling with the same issue. Have you found a solution?

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answered Nov 19 '16 at 05:45 PM

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MajekPL
33 12 16 20

avatar image haimat Nov 19 '16 at 10:51 PM

Not really :(

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