Unity Editor script to fix incorrect FBX import scaling

FBXScaleFix.cs

using UnityEditor;
 
public class FBXScaleFix : AssetPostprocessor
{
    public void OnPreprocessModel()
    {
        ModelImporter modelImporter = (ModelImporter) assetImporter;                    
        modelImporter.globalScale = 1;        
        modelImporter.addCollider = true;
        modelImporter.normalImportMode = ModelImporterTangentSpaceMode.Calculate;
 
    }  
}