# Refraction Raytracing translucency issue

**URL:** <https://forums.unrealengine.com/t/refraction-raytracing-translucency-issue/476326>\
**Category:** Asset Creation\
**Tags:** refraction, translucent, unreal-engine, Ray-Tracing, question\
**Created:** [December 23, 2020, 7:02pm UTC](https://forums.unrealengine.com/t/refraction-raytracing-translucency-issue/476326 "2020-12-23T19:02:19Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Teammax](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Teammax](https://forums.unrealengine.com/u/Teammax)\
**Post date:** [December 23, 2020, 7:02pm UTC](https://forums.unrealengine.com/t/refraction-raytracing-translucency-issue/476326/1 "2020-12-23T19:02:19Z")

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I wanted to make a tulle for my project. Made this simple material (attached). but when i tryed to change parameter of refraction nothing happend. Tulle, no matter 0 or 1 in refraction param, still looks like glass. I searched what could be the problem and when i switched off post process all started look normal and refraction parameter again started to work. I found out that its raytracing translucency makes it look so unreal and makes refraction parameter useless. When translucency raytracing is on refraction parameter doesnt change anything at all.

 ![325482-refarctionissue-03.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/8/e/6/8e632f9f8a5e04b11638e474db952a8a0ca28597.jpeg)

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**Author:** ![MTTR0MG](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@MTTR0MG](https://forums.unrealengine.com/u/MTTR0MG)\
**Post date:** [January 21, 2021, 4:31pm UTC](https://forums.unrealengine.com/t/refraction-raytracing-translucency-issue/476326/2 "2021-01-21T16:31:09Z")

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You need to use specular, not the refraction. Refraction doesn’t work with ray-tracing. If you try to change refraction values in the material editor, you will see a change. The reason is material editor is not using ray tracing.