Version: 2017.3
public AssetImporter assetImporter ;


Reference to the asset importer.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;

// Set the scale of all the imported models to "globalScaleModifier" // and dont generate materials for the imported objects

public class CustomImportSettings : AssetPostprocessor { float globalScaleModifier = 0.0028f;

void OnPreprocessModel() { ModelImporter importer = (ModelImporter)assetImporter; importer.globalScale = globalScaleModifier; importer.importMaterials = false; } }