Simul Support ExchangeCategory: WaterIn which version does buoyancy work
vasil rk asked 10 months ago

Hello, in which version of UE4 does buoyancy work ?
I saw that you wrote that you will release an update with a fix for version ue4 4.25.
But I wanted to test it and tried with UE4 versions 4.24, 4.21, and it doesn’t work there either.

I tested a simple buoyancy of a sphere as in your video.

vasil rk replied 10 months ago

Do you have an answer to my question ?

3 Answers
Wayne Littler Staff answered 10 months ago

Hi Vasil,
Buoyancy is something we are working on across all versions.

Tom Cummings replied 9 months ago

Hi Wayne, loving trueSky so far. Just wondering if the buoyancy as shown in the youtube video above is a tech demo of a future update as opposed to a working feature in the standard branch of UE4? Like Vasil I’ve also tried to get this working but no luck.



Stephen McCarty answered 9 months ago

buoyancy seems to work fine in trueSKY v4.2 [LEGACY] versions but is broken in trueSKY v4.2a versions.
In broken versions, when you add TrueSkyWaterBuoyancy to an object and then add TrueSkyWaterProbe as a child to that, the expected buoyancy effect is broken and the object will only either fall or raise in elevation and settings to adjust the MassInKg or TrueSkyWaterProbe Sphere Radius don’t actual adjust buoyancy but instead seem to alter the gravity of the object.  e.g. setting the MassInKg to 1 on a Basic Sphere will cause it to function like a balloon full of helium floating to the sky.

Chris_Simul Staff replied 9 months ago

Hi Stephen – Buoyancy has a bug (as you’ve outlined) within the current 4.2a release – but has been fixed within our internal builds (which will be released to the public relatively soon). functionality between 4.2 and 4.2a versions should however be identical.

apologise for any inconvenience caused by these bugs, we are looking to get a new build through internal testing and ready for release in the coming weeks to ensure our next update is as stable and addresses as many issues as possible.


Stephen McCarty replied 9 months ago

Thanks Chris!

Ingmar Buchner answered 2 months ago

Hi, I just spent a load of time trying to get the buoyancy to work by following the video tutorial, but I just saw this thread. Has the buoyancy issue been resolved yet in the latest version 4.3? I just want to make sure I am not wasting my time struggling with a bug.

Chris_Simul Staff replied 1 month ago

Hi Ingmar – The buoyancy is functional within the latest 4.3 builds for unreal and we have not had any reports to confirm otherwise.
If you do encounter any issues, or you need any assistance don’t hesitate to reach out.


Ingmar Buchner replied 1 month ago

okay, thanks! I’ll keep trying then.

John Greaney replied 1 month ago

Is this the case for current Unity versions also?