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Editor 4.4.2 Crashes on Start With LightPropagationVolumes enabled

As per the topic. If I put r.LightPropagationVolume=1 in the ConsoleVariables.ini I get a crash on Editor startup.

I know that LPVs are experimental works in progress, but I was hoping to see how they worked with a couple of small scenes I want to set up.

I had the same crash behaviour with 4.4.1.

Is this a known issue with this version of the editor or am I doing something wrong?

Thanks!

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asked Sep 12 '14 at 09:06 PM in Bug Reports

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excelynx
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avatar image Ben Halliday STAFF Sep 13 '14 at 04:36 PM

Hey excelynx,

Thank you for your report. We have assigned this issue to a member of our support staff, and they will begin investigation as soon as possible. If we are unable to reproduce the issue, or we need additional information, our staff member will comment here with additional questions. Otherwise, we will post an ‘Answer’ once we have logged the issue in our bug database or we have a solution for it.

In the meantime, please be sure to review our suggestions for how to report a bug, and feel free to edit your post if you have additional information to provide:

https://answers.unrealengine.com/questions/12363/how-do-i-report-a-bug.html

Please zip and attach the crash logs and dump files from your project directly after a crash, as well as your system information.

Thanks!

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2 answers: sort voted first

So I did a little more digging and found the cause on my end:

If I end the OVRService_x64.exe, everything starts up and works fine, including the LPVs.

I initially tried removing nvwgf2umx.dll, which then led to a crash in OVRDisplay64.dll. Then I figured it might have something to do with the OVRService_x64.exe, killed that and lo and behold the editor with LPVs enabled works just fine.

Obviously having the editor crash if I have the OVRService_x64 running isn't ideal, and to my knowledge LPVs were recently fixed (4.3 or so) to work in VR/stereo mode - so I'm not sure what the root cause is.

Hopefully that information helps!

EDIT: The fix may actually be the result of using the power button to turn the Rift off, rather than ending the OVRService_x64.exe. The Rift is currently set to Direct Mode. It definitely has something to do with the Rift being either on or enabled.

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answered Oct 03 '14 at 08:54 PM

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excelynx
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avatar image Tim Hobson ♦♦ STAFF Oct 03 '14 at 09:05 PM

Thanks for updating. I've gone ahead and marked this as the answer in the event that it helps someone else with a similar issue.

Thanks again!

Tim

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Hi,

There is a known issue with LPV and translucent materials that will instantly crash the editor. We have recently escalated this issue to see if we can at least get a fix in to stop the crash from happening.

To clarify, when LPV is on and if you are starting up the editor with the basic level with the two chairs statue with glass and that table. If you click on the glass translucent material it will crash the editor.

If you're getting different results, please list your steps to clearly reproduce the error and I will test it out to make sure it's not the same issue.

Thank you!

Tim

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answered Sep 15 '14 at 04:08 PM

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Tim Hobson ♦♦ STAFF
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avatar image excelynx Sep 16 '14 at 12:11 AM

Hi Tim!

This is actually just a straight-up crash when loading the editor before the editor is even responsive.

All I'm getting in the callstack is:

!Id:b8ce49c7ec19650c77c0aca78b33f708

From the logs:

[2014.09.16-00.03.51:086][ 0]LogRenderer:Warning: Reallocating scene render targets to support 32x32. [2014.09.16-00.03.51:123][ 0]LogRenderer:Warning: Reallocating scene render targets to support 1144x896. [2014.09.16-00.03.51:225][ 0]LogCrashTracker:

[2014.09.16-00.03.54:692][ 0]LogWindows:Error: appError called: Rendering thread exception: Fatal error!

Address = 0xf17f75c6 (filename not found) [in C:\Windows\system32\nvwgf2umx.dll]

and

Unhandled Exception: EXCEPTION_INT_DIVIDE_BY_ZERO

[2014.09.16-00.03.54:841][ 0]LogWindows: Rendering thread exception: Fatal error!

Address = 0xf17f75c6 (filename not found) [in C:\Windows\system32\nvwgf2umx.dll]

This is version 4.4.2 - 2289767 binary.

I'm running a GTX 780 with the 340.52 drivers.

If you need any other information from me, please feel free to let me know!

Thanks for your time and help!

Simon

avatar image Tim Hobson ♦♦ STAFF Sep 16 '14 at 02:35 PM

Can you post the Crash Logs and Dmp from your project here in a zip file. ([your project ] / Saved / Logs /)

Also, are you using any other changes to your consolevariables.ini file or are you just using the one variable listed above?

Is this happening with all projects or a specific one?

If it's happening with a specific one, can you tell me which template/project to use to test on my end?

Thank you!

Tim

avatar image excelynx Sep 16 '14 at 04:54 PM

Sure, Tim!

The only change to ConsoleVariables.ini is the aforementioned "r.LightPropagationVolume=1"

This is happening with all projects.

Doing some Googling for nvwgf2umx.dll only brings up an issue with another DX11 game.

It's kind of a strange issue in that it only happens with that variable enabled and is completely fine otherwise.

Let me know if you need anything else from me.

Thanks!

Simon

Logs

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