ScriptedImporter.OnImportAsset

参数

说明

派生类必须覆盖此方法，且资产管线会调用该方法来导入文件。

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

        var material = new Material(Shader.Find("Standard"));
        ctx.DependsOnCustomDependency("StandardShaderDependencyHash");

        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);
    }
}

如需在以上示例中使用 Shader.Find() 函数，您需要编写自定义依赖项（用于查找您要找到的着色器）并定期对其进行更新。此操作可防止 Shader.Find() 函数绕过其他依赖性检查方法。以下代码是一个示例，演示如何编写此用途的自定义依赖项。

using UnityEditor;
using UnityEngine;

static class ShaderDependencyUpdater
{
    [InitializeOnLoadMethod]
    static void ShaderDependencyInit()
    {
        EditorApplication.update += ShaderDependencyUpdate;
    }
    static void ShaderDependencyUpdate()
    {
        var shader = Shader.Find("Standard");
        AssetDatabase.TryGetGUIDAndLocalFileIdentifier(shader, out var guid, out long id);
        var hash = new Hash128();
        hash.Append(guid);
        hash.Append(id);
        AssetDatabase.RegisterCustomDependency("StandardShaderDependencyHash", hash);
    }
}