# Nvidia flex broken? **URL:** \ **Category:** C++\ **Tags:** unreal-engine, Engine-Source-Code, GitHub, Engine-Source-GitHub\ **Created:** [February 19, 2019, 1:38am UTC](https://forums.unrealengine.com/t/nvidia-flex-broken/122567 "2019-02-19T01:38:31Z")\ **Posts on this page:** 1\ **Showing post:** 4
**Author:** ![Gallonmate](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Gallonmate](https://forums.unrealengine.com/u/Gallonmate)\ **Post date:** [February 19, 2019, 10:03pm UTC](https://forums.unrealengine.com/t/nvidia-flex-broken/122567/4 "2019-02-19T22:03:05Z")
You mean port flex to 4.21? Yes it’s possible. You would need to know some c++ and the UE4 engine changes, if you follow along this thread here it sort of explains it: [https://forums.unrealengine.com/community/general-discussion/24447-nvidia-gameworks-integration?p=1568578#post1568578](https://forums.unrealengine.com/community/general-discussion/24447-nvidia-gameworks-integration?p=1568578#post1568578) > [@NVIDIA GameWorks Integration](https://forums.unrealengine.com/t/nvidia-gameworks-integration/16686/5287): > > The main issue with FleX is just the work amount, I haven’t encountered any showstoppers there, I just simply don’t have time to fix all the issues. Main thing that will keep people busy who will try to port it to 4.21 is the physics changes but you can find plenty of examples of the new physics interface on the code base (this is how I ported Blast to 4.21). The newest working flex was ported by 0lento for 4.20. You can see all his porting/custom work here: [https://github.com/0lento/UnrealEngine/tree/4.21-GameWorks](https://github.com/0lento/UnrealEngine/tree/4.21-GameWorks) Keep in mind he has flex 4.21 wip listed in his git but he only put it up so that someone else could attempt to finish the work needed. --- _[View the full topic](https://forums.unrealengine.com/t/nvidia-flex-broken/122567)._