# Normal map compression error? **URL:** \ **Category:** Asset Creation\ **Tags:** normal-map, metallic, unreal-engine, question\ **Created:** [February 27, 2021, 5:28am UTC](https://forums.unrealengine.com/t/normal-map-compression-error/479508 "2021-02-27T05:28:40Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![Mask3d](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Mask3d](https://forums.unrealengine.com/u/Mask3d)\ **Post date:** [February 27, 2021, 5:28am UTC](https://forums.unrealengine.com/t/normal-map-compression-error/479508/1 "2021-02-27T05:28:40Z")
So basically I have created this window in Substance painter and the display in substance has this nice subtle normal map definition: ![331064-window-1.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/5/3/3/533b5140b2ab8ee8f27f678f7805d612a48feb1c.png) However when I import it into unreal the combination of the normal map and the roughness/metallic seems to be creating these weird split effects. ![331066-window-2.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/1/8/8/188bc1adf20409fa2f40953a4e0fcf15a6cc9f41.png) Originally my first thought was that it is to do with compression however I have tried the following and nothing seemed to work: -changing the compression settings for the images in unreal -changing the bitrate in substance/photoshop -using srbg or rgb -definitely seems like the metallic is what makes the definitions obvious even if the normal map is what creates the effect -for some reason the other metal objects dont show signs of this, so I tested to see if there needed to be more depth, this also didnt have the desired effect -tried separating the actual window part of the mesh so the face normals could maybe look better Whilst I would probably be able to resolve this by making the window completely flat, it’s not the look I was going for and would like to know for future reference, so if anyone has any ideas for a fix, please let me know.