4.10.1 Auto Reimport loosing Lightmap UV

Development Rendering
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Hi Andrew,

We’ve updated the build to 4.11.1 (we were using 4.10.1) and the issue hasn’t represented itself, however i’ll tread through the previous steps anyway.

  1. Static Mesh geometry and UVs (only one UV channel) were created in MAYA 2016 LT
  2. The Geometry was exported to FBX ASCII 2014/2015 from MAYA’s export selected dialogue.
  3. The geometry was imported to UE4 (10.1) with ‘Auto generate Light Map UVs’ set to true. (UE4 at this stage already had ‘Auto Re-import’ Enabled.
  4. Checking the Static Mesh would reveal that the Geometry and Custom UV (on channel zero) had imported correctly and that Light Map UVs had been generated on UV Channel One.
  5. Static Mesh Geometry or UV were then edited in MAYA 2016 LT and exported to FBX ASCII 2014/2015, overwriting the previous file.
  6. UE4’s Auto Re-import would then re-import the static mesh.
  7. Checking the Static Mesh would reveal that the Geometry and Custom UV (on channel zero) had re-imported correctly, however there would only be channel zero for the custom UV and now no channel two for any light map UVs.

Again it was intermittent so sometimes the light map would be fine.
Sorry I didn’t capture any screen shots to help with the process.

Thanks.