I met a problem in build a blueprint tool. I m trying to use blueprint to batch processing static mesh vertex colors with blueprint tools. I wrote a C++ blueprint function which use a static object as input and delete its vertex color, but looks like the changes were not saved .

here is my function :

...
for (FStaticMeshLODResources& LODResource : RenderData->LODResources)
{

    if (LODResource.bHasColorVertexData)
    {
        LODResource.VertexBuffers.ColorVertexBuffer.ReleaseResource();
        LODResource.VertexBuffers.ColorVertexBuffer.CleanUp();
        LODResource.bHasColorVertexData = false;
    }
}
StaticMesh->PostEditChange();
StaticMesh->MarkPackageDirty();
...

log shows the function works but when I open the vertex color editor, the vertex color data still shows on my static mesh.

I met a problem in build a blueprint tool. I m trying to use blueprint to batch processing static mesh vertex colors with blueprint tools. I wrote a C++ blueprint function which use a static object as input and delete its vertex color, but looks like the changes were not saved .

here is my function :

...
for (FStaticMeshLODResources& LODResource : RenderData->LODResources)
{

    if (LODResource.bHasColorVertexData)
    {
        LODResource.VertexBuffers.ColorVertexBuffer.ReleaseResource();
        LODResource.VertexBuffers.ColorVertexBuffer.CleanUp();
        LODResource.bHasColorVertexData = false;
    }
}
StaticMesh->PostEditChange();
StaticMesh->MarkPackageDirty();
...

log shows the function works but when I open the vertex color editor, the vertex color data still shows on my static mesh.

• c++
• unreal-engine5
• unreal-blueprint

Share Improve this question Follow asked Mar 22 at 3:22 YouanYouan 1111 silver badge33 bronze badges 1

• It works by using api StaticMesh->RemoveVertexColors(); – Youan Commented Mar 25 at 7:07

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1 Answer 1

Sorted by: Reset to default 2

If you want to save the asset after you've made changes to it, you need to explicitly save it.

Call UEditorAssetLibrary::SaveLoadedAsset to save it:

/**
 * Save the packages the assets live in. All objects that live in the package will be saved. Will try to checkout the file.
 * @param   AssetToSave       Asset that we want to save.
 * @param   bOnlyIfIsDirty    Only checkout asset that are dirty.
 * @return  True if the operation succeeds.
 */
UFUNCTION(BlueprintCallable, Category = "Editor Scripting | Asset")
static bool SaveLoadedAsset(UObject* AssetToSave, bool bOnlyIfIsDirty = true);