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Movable Object Jitter/Bounce

I have found that if there is a moving platform or moving object that has a Movable Object on top of it be it a Character, Pawn, Physics Object etc. they will all jitter/bounce on top of the moving platform/object.

Steps To reproduce:

  1. A new Project with a Movable Static Mesh with any type of collision that Blocks All that is moving around (if possible set it up so that it moves around on a circular spline, it is the most noticeable in that case).

  2. Place a Physics Object or Character directly on top of it and you should see the jitter/bounce.

  3. View from both a Player Camera and from the PIE Camera using Simulate.

To Note the Moving Platform won't Jitter, only the object that's on top of it in rest state will.

alt text

Product Version: UE 4.15
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asked Apr 22 '17 at 03:13 PM in Bug Reports

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ujrkingdom
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2 answers: sort voted first

Hey ujrkingdom,

I think that RoboScorpion is partly correct; however, we do have a ticket in for this issue that you can track using the link below:

https://issues.unrealengine.com/issue/UE-39791

Have a great day!

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answered Apr 25 '17 at 02:17 PM

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Sean L ♦♦ STAFF
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I think that's just the nature of how collisions work.

Some ways I've seen people get around it is by attaching the object to the platform its' riding, that way any time the platform moves the object will inherit that movement. You can detect if something is on the platform by having a shallow volume on top of the platform that detects objects, or you can do a short shape trace from the top of the platform upwards. If that doesn't work you could also try calculating the transformation offset from where the platform was previous, to where it is now, and then apply that offset transform to the object riding the platform.

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answered Apr 22 '17 at 03:48 PM

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RoboScorpion
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