# Artefacts around eyes when using Post Process Material

**URL:** <https://forums.unrealengine.com/t/artefacts-around-eyes-when-using-post-process-material/2028911>\
**Category:** XR Development\
**Tags:** Post-Processing, rendering-artifact, unreal-engine, bug-report, question\
**Created:** [September 20, 2024, 1:56am UTC](https://forums.unrealengine.com/t/artefacts-around-eyes-when-using-post-process-material/2028911 "2024-09-20T01:56:50Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Loux\_xavier](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/loux_xavier/32/1201519_2.png) [@Loux\_xavier](https://forums.unrealengine.com/u/Loux_xavier)\
**Post date:** [September 20, 2024, 1:56am UTC](https://forums.unrealengine.com/t/artefacts-around-eyes-when-using-post-process-material/2028911/1 "2024-09-20T01:56:50Z")

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Hello!  
If I create a post process material and use it in VR I will have color glitches and weird artefacts all around the right eye. It visible in game when I turn my head quickly.

![PostProcessGlitch-ezgif.com-optimize](https://d3kjluh73b9h9o.cloudfront.net/original/4X/d/9/c/d9c94eb44dbbff0de4e013f0a57cb84a86f2c5c5.gif)

Do you have any idea why I’m getting this?  
I’m using 5.4.4 version with Steam Index, it happened too with Quest 3.

You can reproduce the issue in the default Virtual Reality Sample with a simple post process.

 ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/c/e/5/ce53945b5674014e3d4c8d1b69916b79b37541bc.jpeg)  
 ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/b/f/7/bf75fc597ce93131ed6397165a6f0e2b1695650f.png)

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**Author:** ![Rectus\_SA](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Rectus\_SA](https://forums.unrealengine.com/u/Rectus_SA)\
**Post date:** [September 20, 2024, 9:23am UTC](https://forums.unrealengine.com/t/artefacts-around-eyes-when-using-post-process-material/2028911/2 "2024-09-20T09:23:03Z")

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Looks like it’s failing to clear the color of the hidden area mesh. It could be an engine bug. If you don’t want to wait for Epic to fix it (or fix it yourself), it should be possible to work around it by setting the console variable `vr.HiddenAreaMask` to 0. Note that it will have an impact on performance though.

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<div class="post-metadata">

**Author:** ![Loux\_xavier](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/loux_xavier/32/1201519_2.png) [@Loux\_xavier](https://forums.unrealengine.com/u/Loux_xavier)\
**Post date:** [October 6, 2024, 3:41am UTC](https://forums.unrealengine.com/t/artefacts-around-eyes-when-using-post-process-material/2028911/3 "2024-10-06T03:41:35Z")

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Thanks for your reply and the console variable.  
I will wait for the engine fix because I can’t afford any more performance loss, hoping it will be fixed for 5.5