Unity's AssetBundle system to dynamically load FBX models

In Unity, FBX models can be dynamically loaded using C# scripts and Unity's AssetBundle system. Here is a simple example showing how to dynamically load an FBX model:

Prepare the FBX model

First, prepare one or more FBX models and import them into your Unity project. Make sure that each FBX model has a separate GameObject that has been properly set to the "Static" or "Dynamic" type.

2. Create AssetBundle

Next, create an AssetBundle and add the FBX model to it. AssetBundles can be created using Unity's Editor tool or C# code. Here is a sample code:

using UnityEngine;
using UnityEditor;
using System.IO;

public class CreateAssetBundle : MonoBehaviour
{

    [MenuItem("Assets/Build AssetBundle")]
    static void BuildAssetBundle()
    {
        string assetBundleDirectory = "Assets/AssetBundles";
        if (!Directory.Exists(assetBundleDirectory))
        {
            Directory.CreateDirectory(assetBundleDirectory);
        }

        // Build asset bundle from selected objects
        Object[] selectedObjects = Selection.objects;
        BuildPipeline.BuildAssetBundle(Selection.activeObject, selectedObjects,
          Path.Combine(assetBundleDirectory, "fbxmodels"), BuildAssetBundleOptions.None, BuildTarget.StandaloneWindows64);
    }
}

3. Load AssetBundle

Finally, the AssetBundle is loaded at runtime, and the FBX model is obtained from it. You can use the WWW class or the UnityWebRequest class to load the AssetBundle, and use the AssetBundle.LoadAsset method to get the FBX model. Here is a sample code:

using UnityEngine;
using System.Collections;

public class LoadAssetBundle : MonoBehaviour {

    public string bundleUrl;
    public string assetName;

    IEnumerator Start () {
        // Load asset bundle from URL
        using (WWW www = new WWW(bundleUrl)) {
            yield return www;
            if (!string.IsNullOrEmpty(www.error)) {
                Debug.Log(www.error);
                yield break;
            }

            AssetBundle bundle = www.assetBundle;

            // Load FBX model from asset bundle
            Object obj = bundle.LoadAsset(assetName);
            GameObject go = Instantiate(obj) as GameObject;
            go.transform.parent = transform;

            bundle.Unload(false);
        }
    }
}

In this example, bundleUrl is the URL of the AssetBundle and assetName is the name of the FBX model.

In conclusion, to dynamically load FBX models, you can use Unity's AssetBundle system, and load the AssetBundle to get the FBX models. First, you need to add the FBX model to the AssetBundle and create an AssetBundle file. Then, load the AssetBundle at runtime and use the LoadAsset method to get the FBX model from it.

Unity's AssetBundle system to dynamically load FBX models

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