# Fat lines example issue

**URL:** <https://discourse.threejs.org/t/fat-lines-example-issue/66903>\
**Category:** Questions\
**Tags:** materials, shaders\
**Created:** [June 16, 2024, 11:37am UTC](https://discourse.threejs.org/t/fat-lines-example-issue/66903 "2024-06-16T11:37:45Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Kokleekio](https://avatars.discourse-cdn.com/v4/letter/k/ec9cab/32.png) [@Kokleekio](https://discourse.threejs.org/u/Kokleekio)\
**Post date:** [June 16, 2024, 11:37am UTC](https://discourse.threejs.org/t/fat-lines-example-issue/66903/1 "2024-06-16T11:37:45Z")

</div>

I tried to recreate the fat lines example [https://threejs.org/examples/?q=fat%20li#webgl\_lines\_fat](https://threejs.org/examples/?q=fat%20li#webgl_lines_fat) but I ran into an issue when using LineGeometry with worldUnits and alphaToCoverage, then I get these ugly circle lines appearing on my fat lines:

 ![fat_lines_bug](https://canada1.discourse-cdn.com/flex035/uploads/threejs/original/3X/4/4/44e86e16e12f95d2e1853fdbd6c8636b0f9db161.png)

I tried recreating the example line by line and have the latest Three.js version installed so I cannot find what is the difference between the example and my local machine.

Any idea what I might be doing wrong?

For reference this is a picture comparing my results with alphaToCoverage turned off/on. The whiteish circles appear only when alphaToCoverage is enabled, but I want to have it enabled to make the edges smoother.

 ![expected](https://canada1.discourse-cdn.com/flex035/uploads/threejs/original/3X/2/4/2418efadb4bab17a7c30109f6458a4b3e2b18113.png)