# 'Use Translucency Vertex Fog' does not work on Metal

**URL:** <https://forums.unrealengine.com/t/use-translucency-vertex-fog-does-not-work-on-metal/376063>\
**Category:** Asset Creation\
**Tags:** Fog, metal, unreal-engine, question\
**Created:** [November 11, 2016, 5:58pm UTC](https://forums.unrealengine.com/t/use-translucency-vertex-fog-does-not-work-on-metal/376063 "2016-11-11T17:58:14Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![anonymous\_user\_c94f194d](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_c94f194d](https://forums.unrealengine.com/u/anonymous_user_c94f194d)\
**Post date:** [November 11, 2016, 5:58pm UTC](https://forums.unrealengine.com/t/use-translucency-vertex-fog-does-not-work-on-metal/376063/1 "2016-11-11T17:58:14Z")

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When trying to disable vertex fog from material that is using translucent or alpha composite blend mode it does work on on SM5 but not on Metal.

 ![114587-sm5.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/0/1/5/0159faf985921491c354a693919fd9d59ff8bd48.jpeg)

 ![114588-metal.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/a/1/7a1c7f9a63f4ed14cea2cfd4de8913b4c5f6652a.jpeg)

It’s also seems that translucent vertex fog does get much brighter than fog for opaque objects for some reason.

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**Author:** ![anonymous\_user\_bcdd396d](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_bcdd396d](https://forums.unrealengine.com/u/anonymous_user_bcdd396d)\
**Post date:** [November 15, 2016, 9:45pm UTC](https://forums.unrealengine.com/t/use-translucency-vertex-fog-does-not-work-on-metal/376063/2 "2016-11-15T21:45:39Z")

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Hi Kalle-H,

Thank you for submitting a bug report. I have reproduced the issue and logged it as UE-38650 which you can track on the following link: [Unreal Engine Issues](https://issues.unrealengine.com/). Please be aware that since the issue must be reviewed and prioritized by our development staff, it may be a while before it can be addressed.

-.

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**Author:** ![anonymous\_user\_bcdd396d](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_bcdd396d](https://forums.unrealengine.com/u/anonymous_user_bcdd396d)\
**Post date:** [January 18, 2017, 4:51pm UTC](https://forums.unrealengine.com/t/use-translucency-vertex-fog-does-not-work-on-metal/376063/3 "2017-01-18T16:51:38Z")

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Hi Kalle-H,

The test I created with 2 spheres, one with vertex fog from a material enabled, one disabled, is no longer showing this as a bug in UE 4.13.2. Are you still experiencing this issue and, if so, can you provide a sample project with simple repro steps that we can follow to reproduce the bug on our end?

If so, send a link to the test project zipped and uploaded to Dropbox, Google drive etc. in a private message to me on our .

Thanks,

.

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<div class="post-metadata">

**Author:** ![anonymous\_user\_c94f194d](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_c94f194d](https://forums.unrealengine.com/u/anonymous_user_c94f194d)\
**Post date:** [December 5, 2017, 12:45pm UTC](https://forums.unrealengine.com/t/use-translucency-vertex-fog-does-not-work-on-metal/376063/4 "2017-12-05T12:45:32Z")

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There is proper fix for Mobile.  
[https://github.com/EpicGames/UnrealEngine/pull/4281](https://github.com/EpicGames/UnrealEngine/pull/4281)