Legacy Blend Shape Normals missing on Modelimporter?

Unity Engine
,
1

Hi,

I wrote a model-import-editor-plugin for unity. Now I have the problem that I can’t find how to enable “Legacy Blend Shape Normals” in code.
As far as I understand it should be possible to enable this bool on the modelimporter (Unity - Scripting API: ModelImporter)

I can find every other property I need to adjust on the modelimporter (see picture below), but this one seems to be missing.

Does anyone know where it is located or where I can access and set the bool for Legacy Blend Shape Normals?

Best regards,
Dominik

7474013--918755--screenshot.jpg
7474013--918755--screenshot.jpg534×621 61.7 KB

2

I’ll push this one as well.
I want to set “Legacy Blendshape Normals” in the ModelImport Settings to “true” by default but wasn’t able to find anything

3

Please make this happen. We need this setting, and its not acceptable that artist have to manually press this for every asset. Very prone to error.

Please make this public :slight_smile:

    internal extern bool legacyComputeAllNormalsFromSmoothingGroupsWhenMeshHasBlendShapes { [MethodImpl(MethodImplOptions.InternalCall)] get; [MethodImpl(MethodImplOptions.InternalCall)] set; }
1 Like
4

Also pushing this egain

5

8498315--1131383--upload_2022-10-8_14-1-28.png
Had to “Cheat” a bit but was able to modify the UnityEditor.dll for my project.
Now I can access legacyComputeAllNormalsFromSmoothingGroupsWhenMeshHasBlendShapes in Script

6

Definitely a bit late on this, but you can do it this way too:

public class ModelImportManager : AssetPostprocessor
{
void OnPreprocessModel()
    {
        Debug.Log($"Handling import for model {assetPath}");
        ModelImporter modelImporter = assetImporter as ModelImporter;
        modelImporter.isReadable = true;

        //Force legacy blendshape normals
        string pName = "legacyComputeAllNormalsFromSmoothingGroupsWhenMeshHasBlendShapes";
        PropertyInfo prop = modelImporter.GetType().GetProperty(pName, BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public);
        prop.SetValue(modelImporter, true);

        EditorUtility.SetDirty(modelImporter);
        modelImporter.SaveAndReimport();
    }
}

This will force this on all imported models, but of course you could add more logic to only set it sometimes.

7

This was helpful, thank you!

1 Like