Unity接入火山引擎/豆包大模型文生图，实现AI绘画

1.访问火山引擎

2.注册后实名信息

3.产品—火山方舟—视觉大模型。找到对应模型，开通或者免费领取体验资源

4.点击查看详情—立即使用，按步骤获取产品密钥

5.打开unity 新建脚本（以下为主要方法，构建请求体后创建签名及认证）

 IEnumerator GenerateImage()
    {
        long timestamp = GetTimestamp();
        string method = "POST"; // 请求方法，固定为POST，可根据实际情况调整
        string path = ""; // 这里假设你的请求路径是/generate，需根据实际API调整
        string contentType = "application/json"; // 根据请求体内容类型设置

        // 构建请求的JSON格式数据，按照文档里请求格式要求填充各参数
        ImageGenerationRequest requestData = new ImageGenerationRequest
        {
            req_key = "high_aes_general_v20_L",
            prompt = InputField.text,
            model_version = "general_v2.0_L",
            req_schedule_conf = "general_v20_9B_rephraser",
            seed = -1,
            scale = 3.5f,
            ddim_steps = 16,
            width = 512,
            height = 512,
            use_sr = true,
            return_url = false,
            logo_info = new LogoInfo
            {
                add_logo = false,
                position = 0,
                language = 0,
                opacity = 0.3f,
                logo_text_content = "这里是明水印内容"
            }
        };
        string requestBody = JsonUtility.ToJson(requestData);

        // 生成签名
        string signature = GenerateSignature(timestamp, accessKey, secretKey, method, path, contentType, requestBody);
        //string signature = "1caf8e82d88a9fc8f094f6d800616522e7c78f23f7e4ee568625b9b825e15eb0";
        //Debug.Log(signature);
        UnityWebRequest request = new UnityWebRequest(apiUrl, method);
        byte[] bodyRaw = Encoding.UTF8.GetBytes(requestBody);
        request.uploadHandler = (UploadHandler)new UploadHandlerRaw(bodyRaw);
        request.downloadHandler = (DownloadHandler)new DownloadHandlerBuffer();

        // 设置Content-Type请求头
        request.SetRequestHeader("Content-Type", contentType);

        //设置Host请求头，从API请求地址中提取主机部分
        //string host = new Uri(apiUrl).Host;
        // request.SetRequestHeader("host", host);

        // 设置X-Date请求头，使用获取到的时间戳转换后的格式
        string xDate = GetFormattedXDate(timestamp);
        request.SetRequestHeader("X-Date", xDate);

        // 计算并设置X-Content-Sha256请求头，对请求体内容计算SHA256哈希值
        string xContentSha256 = HashSHA256(bodyRaw);
        request.SetRequestHeader("X-Content-Sha256", xContentSha256);
        Debug.Log(xContentSha256);

        // 构建并设置Authorization请求头，包含签名等认证信息
        string credentialScope = $"{xDate.Substring(0, 8)}/{region}/{service}/request";
        string authorizationHeader = $"HMAC-SHA256 Credential={accessKey}/{credentialScope}, SignedHeaders=host;x-content-sha256;x-date, Signature={signature}";


        request.SetRequestHeader("Authorization", authorizationHeader);


        yield return request.SendWebRequest();

        // 按照新的方式判断请求结果，使用isDone和isNetworkError、isHttpError属性来替代原来的.result属性判断
        if (request.isDone)
        {
            // 解析返回的JSON数据，获取图片相关内容并处理显示（按文档返回格式要求操作）
            string responseJson = request.downloadHandler.text;
            Debug.Log(responseJson);
            ImageGenerationResponse response = JsonUtility.FromJson<ImageGenerationResponse>(responseJson);
            if (response.data.binary_data_base64 != null && response.data.binary_data_base64.Count > 0)
            {
                byte[] imageBytes = System.Convert.FromBase64String(response.data.binary_data_base64[0]);
                Texture2D texture = new Texture2D(2, 2);
                texture.LoadImage(imageBytes);
                Sprite sprite = Sprite.Create(texture, new Rect(0, 0, texture.width, texture.height), new Vector2(0.5f, 0.5f));
                resultImage.sprite = sprite;
            }
            else
            {
                Debug.LogError("没有获取到有效的图片数据");
            }
        }
        else
        {
            Debug.LogError("请求出错: " + request.error);
        }
    }

6.效果