# Static Mesh planes and Landscape do not properly implement "Shadow Two Sided" **URL:** \ **Category:** Rendering\ **Tags:** lighting-error, unreal-engine, Landscape, lighting-problem, question\ **Created:** [December 10, 2015, 9:23am UTC](https://forums.unrealengine.com/t/static-mesh-planes-and-landscape-do-not-properly-implement-shadow-two-sided/341023 "2015-12-10T09:23:25Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![HuntaKiller](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@HuntaKiller](https://forums.unrealengine.com/u/HuntaKiller)\ **Post date:** [December 10, 2015, 9:23am UTC](https://forums.unrealengine.com/t/static-mesh-planes-and-landscape-do-not-properly-implement-shadow-two-sided/341023/1 "2015-12-10T09:23:25Z")
Found bug in 4.9.2, confirmed to persist in 4.10.1 **To Recreate:** Create blank project, delete SkySphere\_bp, clear everything except for: 1. a blank post process (just make sure to set indirect illumination intensity to 0 so there is no ambient lighting) 2. A default, dynamic Directional light 3. A static mesh plane, or a landscape, set to material that does not have a flat normal map. Make sure to check the “Shadow Two Sided” boolean is set to true on both. 4. Make sure to re-build the lighting to clear any old lightmaps 5. Set directional lighting to an upward angle, but not completely perpendicular to the plane and landscape. My picture uses a 50 degree upward angle. _Note that the normals of both the landscape, and the plane surface are being lit when they definitely should not be._ ![70016-confirmedbug.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/4/a/c/4ac17eb237e367bbda42c382eaa6ca8ce5f8aa7c.jpeg) ][1] ---
**Author:** ![HuntaKiller](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@HuntaKiller](https://forums.unrealengine.com/u/HuntaKiller)\ **Post date:** [December 13, 2015, 2:41am UTC](https://forums.unrealengine.com/t/static-mesh-planes-and-landscape-do-not-properly-implement-shadow-two-sided/341023/2 "2015-12-13T02:41:50Z")
Bump. Very easy to reproduce. Can’t see this being intended behavior. ---
**Author:** ![HuntaKiller](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@HuntaKiller](https://forums.unrealengine.com/u/HuntaKiller)\ **Post date:** [December 16, 2015, 8:52pm UTC](https://forums.unrealengine.com/t/static-mesh-planes-and-landscape-do-not-properly-implement-shadow-two-sided/341023/3 "2015-12-16T20:52:39Z")
Bump. The same results are produced even if the material is “two sided” ---
**Author:** ![anonymous\_user\_6e7b421a](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_6e7b421a](https://forums.unrealengine.com/u/anonymous_user_6e7b421a)\ **Post date:** [December 17, 2015, 9:08pm UTC](https://forums.unrealengine.com/t/static-mesh-planes-and-landscape-do-not-properly-implement-shadow-two-sided/341023/4 "2015-12-17T21:08:38Z")
Hey HuntaKiller, Thank you for taking the time to report this issue. I was able to reproduce this issue on my end and entered a bug report for this issue, **[UE-24656](https://issues.unrealengine.com/issue/UE-24656)**. One this issue has been fixed, it will be integrated in an upcoming full release or hotfix. If you have further questions, please let me know. Thanks, ---
**Author:** ![HuntaKiller](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@HuntaKiller](https://forums.unrealengine.com/u/HuntaKiller)\ **Post date:** [January 23, 2016, 6:24pm UTC](https://forums.unrealengine.com/t/static-mesh-planes-and-landscape-do-not-properly-implement-shadow-two-sided/341023/5 "2016-01-23T18:24:23Z")
Just wondering if this has been looked at at all by the team or if its just on the to-do list, I haven’t been able to find a workaround that solves the problem without removing the sunrise/set. ---
**Author:** ![anonymous\_user\_6e7b421a](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_6e7b421a](https://forums.unrealengine.com/u/anonymous_user_6e7b421a)\ **Post date:** [January 25, 2016, 3:09pm UTC](https://forums.unrealengine.com/t/static-mesh-planes-and-landscape-do-not-properly-implement-shadow-two-sided/341023/6 "2016-01-25T15:09:04Z")
It is still on the to do list. I will add community interest to the bug to help give it a higher priority. ---
**Author:** ![Kristjanmn](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Kristjanmn](https://forums.unrealengine.com/u/Kristjanmn)\ **Post date:** [January 29, 2017, 3:36pm UTC](https://forums.unrealengine.com/t/static-mesh-planes-and-landscape-do-not-properly-implement-shadow-two-sided/341023/7 "2017-01-29T15:36:19Z")
The issue has been set as “Won’t Fix” can we re-open it? I would really want to get it fixed, for this issue is bothering me so much and I don’t want to end up placing planes under the map to keep the light from leaking. ---
**Author:** ![anonymous\_user\_6e7b421a](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_6e7b421a](https://forums.unrealengine.com/u/anonymous_user_6e7b421a)\ **Post date:** [January 29, 2017, 4:25pm UTC](https://forums.unrealengine.com/t/static-mesh-planes-and-landscape-do-not-properly-implement-shadow-two-sided/341023/8 "2017-01-29T16:25:07Z")
Hey Kristjanmn, I just updated the ticket internally to reflect your concerns. If we are able to review the issue again and get a fix, it will be reflected on our public JIRA once the fix has been made. Thank you, ---
**Author:** ![EvoPulseGaming](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@EvoPulseGaming](https://forums.unrealengine.com/u/EvoPulseGaming)\ **Post date:** [January 18, 2018, 3:05am UTC](https://forums.unrealengine.com/t/static-mesh-planes-and-landscape-do-not-properly-implement-shadow-two-sided/341023/9 "2018-01-18T03:05:57Z")
Bug tracker was closed again ---
**Author:** ![HuntaKiller](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@HuntaKiller](https://forums.unrealengine.com/u/HuntaKiller)\ **Post date:** [January 18, 2018, 1:39pm UTC](https://forums.unrealengine.com/t/static-mesh-planes-and-landscape-do-not-properly-implement-shadow-two-sided/341023/10 "2018-01-18T13:39:37Z")
How dumb “no one has complained about this bug in a while so we won’t be fixing it”. I’ll make sure to complain about this more. Epic this is a ridiculous bug, why are surfaces lit from the wrong side? Reopen and address this! ---
**Author:** ![EvoPulseGaming](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@EvoPulseGaming](https://forums.unrealengine.com/u/EvoPulseGaming)\ **Post date:** [January 20, 2018, 3:17am UTC](https://forums.unrealengine.com/t/static-mesh-planes-and-landscape-do-not-properly-implement-shadow-two-sided/341023/11 "2018-01-20T03:17:24Z")
bump… they just did reworked the landscape rendering pipeline… seriously… I get that this isn’t a part of the LOD / Tessellation but its also a shadowing issue… ---
**Author:** ![Derjyn](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/derjyn/32/931618_2.png) [@Derjyn](https://forums.unrealengine.com/u/Derjyn)\ **Post date:** [June 18, 2018, 11:05pm UTC](https://forums.unrealengine.com/t/static-mesh-planes-and-landscape-do-not-properly-implement-shadow-two-sided/341023/12 "2018-06-18T23:05:13Z")
This is still an issue, years later. ---
**Author:** ![HuntaKiller](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@HuntaKiller](https://forums.unrealengine.com/u/HuntaKiller)\ **Post date:** [August 12, 2018, 6:35pm UTC](https://forums.unrealengine.com/t/static-mesh-planes-and-landscape-do-not-properly-implement-shadow-two-sided/341023/14 "2018-08-12T18:35:15Z")
Bump. Still not fixed