# "World position offset" Causing weird black shadow in foliage when using RTX render.

**URL:** <https://forums.unrealengine.com/t/world-position-offset-causing-weird-black-shadow-in-foliage-when-using-rtx-render/470032>\
**Category:** Rendering\
**Tags:** shadow, world-position-offse, unreal-engine, question\
**Created:** [August 19, 2020, 9:40pm UTC](https://forums.unrealengine.com/t/world-position-offset-causing-weird-black-shadow-in-foliage-when-using-rtx-render/470032 "2020-08-19T21:40:35Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![sabbir](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@sabbir](https://forums.unrealengine.com/u/sabbir)\
**Post date:** [August 19, 2020, 9:40pm UTC](https://forums.unrealengine.com/t/world-position-offset-causing-weird-black-shadow-in-foliage-when-using-rtx-render/470032/1 "2020-08-19T21:40:35Z")

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I am using unreal 4.25, with rtx render enable for my level.  
When using foliage with the material property of “World position offset”, it causing weird shadow.

When “world position offset” is disconnected

 ![310752-screenshot-1.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/c/e/8/ce89a1de87563fe174e2f4b0455d4a917a6ad89a.png)

When “world position offset” is connected

 ![310753-screenshot-2.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/d/a/c/daca1f69a11efc1c56595057e34c071a19e2013d.png)

Here is a video demostration

[![](https://d3kjluh73b9h9o.cloudfront.net/original/4X/d/5/f/d5f31405ee0df592f78a414011f4e694746ddcde.jpeg "2020 08 20 03 32 18") ](https://www.youtube.com/watch?v=z_jkbIhqQFY)

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**Author:** ![sabbir](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@sabbir](https://forums.unrealengine.com/u/sabbir)\
**Post date:** [August 22, 2020, 1:11am UTC](https://forums.unrealengine.com/t/world-position-offset-causing-weird-black-shadow-in-foliage-when-using-rtx-render/470032/2 "2020-08-22T01:11:11Z")

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Update: I found the solution also made a video so that no one have to waste their time for it

[![](https://d3kjluh73b9h9o.cloudfront.net/original/4X/6/c/6/6c681bfb4f2d0a1ea76e40f7fd408ea8c6e056e0.jpeg "Black spot appears in Unreal RTX Foliage Problem & Solution") ](https://www.youtube.com/watch?v=CYQIBDhN8HU)

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**Author:** ![ElmoRon](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@ElmoRon](https://forums.unrealengine.com/u/ElmoRon)\
**Post date:** [December 16, 2020, 9:32am UTC](https://forums.unrealengine.com/t/world-position-offset-causing-weird-black-shadow-in-foliage-when-using-rtx-render/470032/3 "2020-12-16T09:32:30Z")

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When I use foliage,no RayRrace menu, can’t Turn on evaluate World position offset.  
Just World outliner can find this .

 ![324968-qq截图20201216172848.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/8/f/6/8f6e29e2856243c8929e295b095eb0b6bcbe2c6d.png)

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**Author:** ![NoaWinged](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/noawinged/32/1099439_2.png) [@NoaWinged](https://forums.unrealengine.com/u/NoaWinged)\
**Post date:** [November 25, 2021, 12:32pm UTC](https://forums.unrealengine.com/t/world-position-offset-causing-weird-black-shadow-in-foliage-when-using-rtx-render/470032/4 "2021-11-25T12:32:09Z")

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This works for static mesh actors well, but not on foliage. As OP has shown in the picture below, this option is not available on Foliage actor. Does anyone found a proper solution to this problem?