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Flickering dynamic shadows on translucent surfaces

We are having an issue with shadows from a movable directional light (sun) being cast onto a translucent water surface. In some parts the shadows pop in & out (see video below) depending on the angle of your HMD (you can also see it outside of VR but in VR it's very noticable).

Video : https://youtu.be/pkLITaR_mA0

Easy to replicate if you create a empty project, add Epic's waterpack, apply the transparant water material , place a dynamic light & some meshes to cast shadows on the water surface. Moving around will make certain parts shadow flicker.

We have been trying to fix this for quite some time but haven't found a solution yet, anyone has any suggestions? Thanks!!

Product Version: UE 4.11
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asked May 11 '16 at 08:26 PM in Bug Reports

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Illusionweaver
21 3 7 10

avatar image AndrewHurley May 11 '16 at 09:32 PM

Hey Illusionweaver,

Try modifying the 'Bounds Scale' of your mesh where the material is applied. Simply click on the mesh in the 'Details' panel and then type in the search bar, 'Bounds' to increase the bounds scale.

If this does not resolve your issue, I will investigate using your steps to see if I can figure out what is going occurring on your end.

Cheers,

Andrew Hurley

avatar image Illusionweaver May 11 '16 at 09:48 PM

Thanks Andrew, just tried this out and it has no effect.

avatar image AndrewHurley May 12 '16 at 02:55 PM

I was unable to reproduce this issue in a blank project using the suggested steps. Could you provide me with either a more in depth explanation on how to reproduce the issue, or provide me with a sample project where the issue already occurs so I can investigate further?

Thanks,

Andrew Hurley

avatar image Illusionweaver May 12 '16 at 04:16 PM

here is a zipped sample project to see the issue in action:

https://drive.google.com/file/d/0B9W7vCaEj45dWlFvaTZnbTZ1OEE/view?usp=sharing

here is a video of how this project looks on my end: https://youtu.be/N3It73941pI

Let me know if you need anything else!

Cheers

avatar image AndrewHurley May 12 '16 at 05:44 PM

There is actually no sample project in the link you shared, but just an example of the issue in a video. This is helpful, but unless I can reproduce this in a blank project with some simple assets, it is going to be hard to determine if this is a bug, or just a setting you could be overlooking or not enabled.

A few questions though, are you using Ray Traced Distance Field Soft Shadows on your directional light?

Since you are creating a VR project, I am assuming you are also previewing the game in the VR preview to get an accurate representation of he final outcome?

Thanks,

Andrew Hurley

avatar image Illusionweaver May 12 '16 at 05:53 PM

I'm sorry Andrew, I accidentally uploaded the wrong file!

here is the correct link : https://drive.google.com/file/d/0B9W7vCaEj45dbFNxV1h0N0ZDNGM/view?usp=sharing

to answer your question 1)generate mesh distance fields is turned off for this project 2)yes we use vr preview all the time:)

avatar image AndrewHurley May 12 '16 at 06:51 PM

So I just attempted to get the flickering to occur on my end, and the issue did not occur running in the VR preview. Could you provide me with your 'dxdiag' so I can take a look at your system's specs?

avatar image Illusionweaver May 12 '16 at 09:27 PM

Hi Andrew, got some more data for you.

We tested this on another machine and we see the same issue (using vive)

however, if we use a Oculus DK2 : we don't see the issue

avatar image Illusionweaver May 13 '16 at 01:30 AM

we tried on another machine, ,this time with a Rift CV1 and we encountered the same issue.

avatar image dorklord_666 May 27 '16 at 12:05 AM

I'm getting same thing. What's the progress on this?

avatar image Rudy Q ♦♦ STAFF May 31 '16 at 01:47 PM

Hello artoculon,

I went ahead and double checked on this issue for you. The status for this issue has not been updated to fixed as of yet. However, I will be sure to bump up the community interest for this issue. Thank you for your time and information.

Make it a great day

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1 answer: sort voted first

Hello Illusionweaver,

I was able to reproduce this issue on our end. I have written up a report (UE-30842) and I have submitted to the developers for further consideration. I will provide updates with any pertinent information as it becomes available. Thank you for your time and information.

Make it a great day

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answered May 16 '16 at 08:38 PM

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Rudy Q ♦♦ STAFF
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avatar image Illusionweaver Jun 28 '16 at 05:12 PM

Hi Rudy, any status update on this please?

avatar image Rudy Q ♦♦ STAFF Jun 28 '16 at 05:34 PM

Hello Illusionweaver,

I went ahead and double checked on this issue for you. It appears that this issue's status has not yet been updated to fixed.

avatar image Siahpoosh Nov 15 '16 at 09:32 AM

same problem here , any update on it ?

avatar image Rudy Q ♦♦ STAFF Nov 15 '16 at 01:51 PM

I have provided a link to the public tracker. Please feel free to use the link provided for future updates.

Link: https://issues.unrealengine.com/issue/UE-30842

Make it a great day

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