Custom properties lost

[Crikster]

Hi, i think it wold be amazing if theres an option to export custom properties, they are getting lost in the way.

thanks!!
Cris

[EdyJ]

I'm definitely interested in this. Could you provide an example file with those custom properties? Also, please describe how to read them in Unity.

[Crikster]

Sure no problem, here a link with a blender file, and some screenshots.
https://www.dropbox.com/sh/l3sm891mncvzxaj/AADCgZ6MFXqgTavGCQl7lXMla?dl=0
So basically the custom properties are just Generic properties the user can define, in my case i am using it for filtering of objects. to create different variations.
in the screenshots:

Blender:
-object custom properties ubication.
-blender default fbx export location of custom properties.

Unity:
-Unity screenshot of my custom script to load this custom properties and filter dynamically.

hope this helps! and thanks for the interest!

[EdyJ]

Thank you for the file and the screenshots! In your custom script, which Unity API methods are you using to access the custom properties? I'll write a simple script to test they work.

[Crikster]

HI sorry for my delayed answer, is a custom script done by another company :(

[EdyJ]

I shouldn't need the entire script, only the Unity API methods and properties being used. Please understand that I need to be able to reproduce the case in Unity in order to fix it.

[EdyJ]

Closing this issue, as I have no way to reproduce it in Unity.

[swingingtom]

@EdyJ thanks for the plugin 👍. I was struggling with nested empties

I can confirm that custom properties are lost during export.
The way to check it in unity is to make a AssetPostProcessor script that post process models, similar to what is there https://docs.unity3d.com/ScriptReference/AssetPostprocessor.OnPostprocessGameObjectWithUserProperties.html

Here is one, paste it in a unity asset folder. It simply lists all custom properties found in FBX.
FBXCustomPropertiesListing

using System;
using UnityEditor;
using UnityEngine;

    public class FBXCustomPropertiesListing: AssetPostprocessor
    {
        void OnPostprocessGameObjectWithUserProperties(GameObject go, string[] propNames, System.Object[] values)
        {
            for (int i = 0; i < propNames.Length; i++)
            {
                string propName = propNames[i];
                System.Object value = (System.Object)values[i];
                Debug.Log("Propname: " + propName + " value: " + values[i]);
            }
        }
    }

If you need a complete unity project with files and scripts, I can provide it too.

[swingingtom]

From the blender fbx exporter, this is use_custom_props parameter
https://docs.blender.org/api/current/bpy.ops.export_scene.html

[EdyJ]

Thank you so much for the AssetPostProcessor example! Also, thank you for the pull request. I'll check it out, but most likely I'll just enable use_custom_props parameter internally. I can't see any reason for disabling it.

[swingingtom]

After asking the request, I felt guilty for not even trying to dive into the source, and I had many excuses, you know, never write python before, that's not my library, not aware of blender plugins, whatever...

But at the end, I manage to, and that was pretty satisfying :)