UE5.7 InterchangeGenericAssetPipeline -> MaterialPipeline are not using parent material for material creation on import, was working in UE5.6

Development Asset Creation
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1

Hi there,

It feels like a bug that the interchange generic pipeline is not using user-selected parent material for asset import, since it was working back in UE5.6 then we upgrade the engine to 5.7 and it no longer generating correct material instances on asset import. Would like to know how can I resolve this issue?

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Cheers

Wei

2

Steps to Reproduce

  1. Duplicate “/Interchange/Pipelines/DefaultAssetsPipeline” into a folder,
  2. Create a material add a color node and link to base color, call this material “M_Test”
  3. Adjust setting of the duplicated pipeline
    1. Common
      1. Reimport Strategy = Preserve Editor Changes Properties
      2. Use Source Name for asset = False
      3. Asset Type Sub Folders
    2. Common Meshes
      1. Force All Mesh as Type = Static Mesh
    3. Static Meshes
      1. Combine Static Meshes
    4. Skeletal Meshes
      1. Import Skeletal Meshes = False
    5. Geometry Caches
      1. Import Geometry Caches = False
    6. Animations
      1. Import Animation = False
    7. Materials
      1. Import Materials = True
      2. Search location = Do not search
      3. Material import = Import as Material instances
      4. identify duplicat materials = True
      5. Parent material = M_Test
  4. Drag a fbx asset into content broswer
  5. Check the Material it generated its not (M_Test)
    1. It uses /InterchangeAssets/Materials/FBXLegacyPhongSurfaceMaterial as parent material
3

Hi Wei,

In 5.7, we removed the creation of material assets when importing FBX files and replaced it with the automatic creation of material instances instead. But, it looks like we overlooked the fact that users may want to use their own material instead of /InterchangeAssets/Materials/FBXLegacyPhongSurfaceMaterial. Sorry about that.

Would it make sense for us to allow users to overwrite the Interchange default material? Would that work for you?

Thanks.

Regards,

Jean-Luc

4

Hi Jean-Luc

Thanks for replying, yes it would be good to allow for overwrite for parent material, it helps with the asset import automation that people can setup afterwards.

How long will this take to implement, do we have a hotfix or next version soon?

Cheers

Wei

5

Hi Wei,

Definitely not a simple change which can be included in a hotfix. It will be done for the next version. Sorry.

However, it may be isolated enough to be retrofit to 5.7 for users which are compiling their own version of the engine.

We will know more when we will have investigated the proper solution to this issue.

Here is a link to the JIRA I created to track the solution to this issue. Not that it may take a couple of days for the link to be activated.

Regards,

Jean-Luc