How to import user defined attributes from FBX files

First let's look at how user defined attributes can be added in Maya.


Here I've added string attribute named StringData and vector attribute named VectorData.

And the attached example project shows you how to write import time post processor script.

Editor/CustomImportProcessor.cs:

Code (CSharp):

1. using UnityEngine;
2. using UnityEditor;
3. using System.IO;
4.  
5. class CustomImportProcessor : AssetPostprocessor {
6.     void OnPostprocessGameObjectWithUserProperties(GameObject go, string[] names, System.Object[] values) {
7.         ModelImporter importer = (ModelImporter)assetImporter;
8.         var asset_name = Path.GetFileName(importer.assetPath);
9.         Debug.LogFormat("OnPostprocessGameObjectWithUserProperties(go = {0}) asset = {1}", go.name, asset_name);
10.         string str = null;
11.         Vector3 vec3 = Vector3.zero;
12.         for (int i = 0; i < names.Length; i++) {
13.             var name = names[i];
14.             var val = values[i];
15.             switch (name) {
16.             case "StringData":
17.                 str = (string)val;
18.                 break;
19.             case "VectorData":
20.                 vec3 = (Vector3)(Vector4)val;
21.                 break;
22.             default:
23.                 Debug.LogFormat("Unknown Property : {0} : {1} : {2}", name, val.GetType().Name, val.ToString());
24.                 break;
25.             }
26.         }
27.         if (str != null || vec3 != Vector3.zero) {
28.             var udh = go.AddComponent<UserDataHolder>();
29.             if (str != null) {
30.                 udh.StringData = str;
31.             }
32.             udh.VectorData = vec3;
33.         }
34.     }
35. }
36.  

UserDataHodler.cs:

Code (CSharp):

1. using UnityEngine;
2.  
3. public class UserDataHolder : MonoBehaviour {
4.     public string StringData;
5.     public Vector3 VectorData;
6. }
7.  

Note: You will want to open and edit WithMyData.fbx in the archive directly with Maya.

 

Passing by just to let you know you have shared something really useful, thanks.