ScriptedImporter

描述

自定义资源导入器的抽象基类。

脚本化导入器是与特定文件扩展名关联的脚本。Unity 的资源管线调用它们来将关联文件的内容转换为资源。

使用 ScriptedImporterAttribute 类可向资源管线注册自定义导入器。

The C# fields of a ScriptedImporter are serialized, exactly like fields on a MonoBehaviour. See Script Serialization for details. You can see these properties in the Inspector and use them to control the behaviour of the importer for each asset. To programmatically access the value of an asset's properties, use AssetImporter.GetAtPath and type cast the return value to the correct class derived from ScriptedImporter. After changing values, trigger a fresh import by calling EditorUtility.SetDirty and then AssetImporter.SaveAndReimport.

using UnityEngine;
using UnityEditor.AssetImporters;
using System.IO;

[ScriptedImporter(1, "cube")]
public class CubeImporter : ScriptedImporter
{
    public float m_Scale = 1;

    public override void OnImportAsset(AssetImportContext ctx)
    {
        var cube = GameObject.CreatePrimitive(PrimitiveType.Cube);
        var position = JsonUtility.FromJson<Vector3>(File.ReadAllText(ctx.assetPath));

        cube.transform.position = position;
        cube.transform.localScale = new Vector3(m_Scale, m_Scale, m_Scale);

        // 'cube' is a GameObject and will be automatically converted into a Prefab
        // (Only the 'Main Asset' is eligible to become a Prefab.)
        ctx.AddObjectToAsset("main obj", cube);
        ctx.SetMainObject(cube);

        var material = new Material(Shader.Find("Standard"));
        material.color = Color.red;

        // Assets must be assigned a unique identifier string consistent across imports
        ctx.AddObjectToAsset("my Material", material);

        // Assets that are not passed into the context as import outputs must be destroyed
        var tempMesh = new Mesh();
        DestroyImmediate(tempMesh);
    }
}

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