Crash when exporting 16-bit single channel textures from UE4 to Omniverse


Create a greyscale 16-bit image in photoshop (pure white 1024x1024 will reproduce the error)
Save as .png
Import into UE4, leave compression as ‘default’
Right click ‘export to Omniverse’

Expected behavior:

Texture is exported to Nucleus

Actual behavior:

Unreal will hard crash with the following error (array size will change depending on the texture):

Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\Build++UE4\Sync\Engine\Source\Runtime\Core\Public\Containers/Array.h] [Line: 703] Array index out of bounds: 2097152 from an array of size 2097152

Unreal 4.27.2
Latest connector at time of posting

Are there any workarounds known for this?

Thanks for reporting this Alex, we’re going to look into it. We are tracking this internally with issue OM-54391.

I’d like to be sure that you were running 4.27 version 105.1.276, please confirm.

Yes -

Hi Alex,
I can’t repro your issue with the greyscale 16-bit image. So could you please send me your crashed UE asset? Maybe there’s something else caused the crash.