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Static Mesh planes and Landscape do not properly implement "Shadow Two Sided"

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.

![alt text][1]

Product Version: UE 4.10
confirmedbug.png (661.7 kB)
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asked Dec 10 '15 at 09:23 AM in Bug Reports

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avatar image HuntaKiller Dec 13 '15 at 02:41 AM

Bump. Very easy to reproduce. Can't see this being intended behavior.

avatar image HuntaKiller Dec 16 '15 at 08:52 PM

Bump. The same results are produced even if the material is "two sided"

avatar image Kristjanmn Jan 29 '17 at 03:36 PM

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.

avatar image AndrewHurley Jan 29 '17 at 04:25 PM

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,

Andrew Hurley

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2 answers: sort voted first

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. 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.


Andrew Hurley

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answered Dec 17 '15 at 09:08 PM

avatar image HuntaKiller Jan 23 '16 at 06:24 PM

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.

avatar image AndrewHurley Jan 25 '16 at 03:09 PM

It is still on the to do list. I will add community interest to the bug to help give it a higher priority.

avatar image EvoPulseGaming Jan 18 '18 at 03:05 AM

Bug tracker was closed again

avatar image HuntaKiller Jan 18 '18 at 01:39 PM

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!

avatar image EvoPulseGaming Jan 20 '18 at 03:17 AM

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...

avatar image Derjyn Jun 18 '18 at 11:05 PM

This is still an issue, years later.

avatar image HuntaKiller Jun 19 '18 at 06:19 AM

It's idiotic how how they've dealt with this issue (not dealt with it)

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Bump. Still not fixed

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answered Aug 12 '18 at 06:35 PM

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