# Problem that HairWorks reflect light **URL:** \ **Category:** Rendering\ **Tags:** hairworks, unreal-engine, lighting-problem, question\ **Created:** [September 30, 2019, 12:20am UTC](https://forums.unrealengine.com/t/problem-that-hairworks-reflect-light/456209 "2019-09-30T00:20:12Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![TrinityMS](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/trinityms/32/1104773_2.png) [@TrinityMS](https://forums.unrealengine.com/u/TrinityMS)\ **Post date:** [September 30, 2019, 12:20am UTC](https://forums.unrealengine.com/t/problem-that-hairworks-reflect-light/456209/1 "2019-09-30T00:20:12Z")
Hello We are creating a «[TrinityMS](https://trinityvideogame.com)» game using Unreal Engine 4.21 with GameWorks from [Olento](https://github.com/0lento/UnrealEngine/tree/4.21-GameWorks+WaveWorks). We met a problem that HairWorks reflect light from point light. The hair makes everything around it much lighter when there is a point light. The problem doesn’t exist in UE4.19. But for creating the game we need to use UE 4.21 (or later) that makes hair to light. [Here is a video about this problem](https://trinityvideogame.com/TrinityMS-UE_4_21.mp4) Would appreciate greatly if you could help us to solve this problem. Thank you ---
**Author:** ![anonymous\_user\_943e62f0](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_943e62f0](https://forums.unrealengine.com/u/anonymous_user_943e62f0)\ **Post date:** [September 30, 2019, 5:22pm UTC](https://forums.unrealengine.com/t/problem-that-hairworks-reflect-light/456209/2 "2019-09-30T17:22:08Z")
Hello, We see you have also posted on the dedicated thread for Nvidia Gameworks issues ([NVIDIA GameWorks Integration - Asset Creation - Epic Developer Community Forums](https://forums.unrealengine.com/community/general-discussion/24447-nvidia-gameworks-integration?53735-NVIDIA-GameWorks-Integration=)). From what I can tell that is the proper method to start having this issue looked into. Nvidia Hairworks is not managed by Epic and reaching out to Nvidia on their recommended channels is the best way to get this issue addressed > **[Unreal Engine 3D Creation Platform](https://developer.nvidia.com/game-engines/unreal-engine)** > > Delivers photoreal visuals and immersive experiences. Regards, ---
**Author:** ![TrinityMS](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/trinityms/32/1104773_2.png) [@TrinityMS](https://forums.unrealengine.com/u/TrinityMS)\ **Post date:** [October 1, 2019, 8:58pm UTC](https://forums.unrealengine.com/t/problem-that-hairworks-reflect-light/456209/3 "2019-10-01T20:58:12Z")
Thank you, we wrote to tech support of Nvidia Regards, Lucy ---
**Author:** ![Adam\_M](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Adam\_M](https://forums.unrealengine.com/u/Adam_M)\ **Post date:** [October 4, 2019, 9:57am UTC](https://forums.unrealengine.com/t/problem-that-hairworks-reflect-light/456209/4 "2019-10-04T09:57:30Z")
Hi Lucy, we are finding that we don’t have the bandwidth on my team to keep abreast with the rapid pace of UE4 development across all our GameWorks technologies. For this reason I am glad when community contributors like Olento are able to take over this work. However we are unable to provide support for the updates he makes to our integrations. We had as you say a working integration, but then Epic made a number of changes (on the engine side), and then Olento made more changes. Following all that it is not easy for me to find the reason why it no longer works. It would be easier if a clean and stable plugin API existed but integrations like that of HairWorks rendering cannot be done in such a simple way. Going forward we will need to change GameWorks integrations to use a different, more easy to maintain approach. Cheers, Adam NVIDIA ---
**Author:** ![muzigege](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@muzigege](https://forums.unrealengine.com/u/muzigege)\ **Post date:** [December 1, 2019, 11:14pm UTC](https://forums.unrealengine.com/t/problem-that-hairworks-reflect-light/456209/5 "2019-12-01T23:14:06Z")
我也遇到了，同样的问题！