# EyeAdaptation material node **URL:** \ **Category:** Rendering\ **Tags:** Eye-Adaptation, unreal-engine, Lighting, question\ **Created:** [January 5, 2017, 11:55pm UTC](https://forums.unrealengine.com/t/eyeadaptation-material-node/381035 "2017-01-05T23:55:11Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![PanDenat](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@PanDenat](https://forums.unrealengine.com/u/PanDenat)\ **Post date:** [January 5, 2017, 11:55pm UTC](https://forums.unrealengine.com/t/eyeadaptation-material-node/381035/1 "2017-01-05T23:55:11Z")
In material editor is a node called EyeAdaptation with one output and no input. What actually is this output? ---
**Author:** ![Luos](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/luos/32/918700_2.png) [@Luos](https://forums.unrealengine.com/u/Luos)\ **Post date:** [January 6, 2017, 1:10pm UTC](https://forums.unrealengine.com/t/eyeadaptation-material-node/381035/2 "2017-01-06T13:10:36Z")
Its related to [Auto Exposure (Eye Adaptation) | Unreal Engine Documentation](https://docs.unrealengine.com/latest/INT/Engine/Rendering/PostProcessEffects/AutomaticExposure/) the ue4 eye adaptation. with this node you can make materials react to the auto exposure. I havent used it myself though, so I dont know what value’s it outputs. ---
**Author:** ![Luos](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/luos/32/918700_2.png) [@Luos](https://forums.unrealengine.com/u/Luos)\ **Post date:** [January 17, 2017, 11:27pm UTC](https://forums.unrealengine.com/t/eyeadaptation-material-node/381035/3 "2017-01-17T23:27:21Z")
apparently it outputs whatever value eyeadaptation is outputting. so if the eye adaptation makes thigns darker, it outputs close to 0, but if it makes stuff EXTREMELY bright, it can hit 64+