Alembic UV

Hi Guys,

I export Alembic Caches out of Maya and other 3rd party problems such as Max with UV’s enabled. I verify the UV’s are intact by opening that same exported file again in Maya or Max etc and its fine.

The issue I am having is when I import that same alembic file into Unreal the UV’s seems to be messed up. First I thought maybe it was flipped or rotated but that does not seem to be the case. So basically my textures aren’t correctly showing.

I am just wondering if this is a minor teething issue as its experimental and whether anyone else has this issue.

Thanks Guys

Appreciate the time.

Hi ,

Can you elaborate on ‘incorrect UV’s’ and maybe attached the cache you are importing so I can take a look. Also which type are you importing the cache as?



Hey Jurre,

Thanks for getting back to me, I have attached an image with roughly what is going on, Its like its inverted (Flipped) the geo and UV’s, so when I flip the UV’s in Maya thinking that will fix the problem, it doesn’t because upon importing an alembic Unreal seems to flip whatever is imported.

I am exporting the cache from Maya alembic.1.0 into unreal as static and have done the test with experimental. The animation is sweet, just this UV issue is a major issue.


link to the cache.

For now as a workaround to the bugs, you can rotate the object -90 deg in X, set -1 on the Z scale. For the uvw, make sure to use a texcoord node in your shader and input -1 value on the V.

You might have to manually set the bounds in your asset for it to draw properly.

Thanks Marc