AssetPostprocessor.assetImporter

Description

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.materialImportMode = ModelImporterMaterialImportMode.None;
    }
}