Blender ↔ RizomUV Addon
Preserves UV groups and metadata through the Blender editing pipeline.
Important: UV groups are only preserved for objects whose topology wasn't changed in Blender.
In some cases, UV edges may be merged during the Blender → RizomUV export cycle.
While working on a large project with 200+ objects in RizomUV, I dididn't notice 2 objects had wrong topology. By time i realized, I had already created extensive UV group organization in RizomUV.
The problem: The RizomUV-Blender bridge does not preserve UV groups when using FBX format, and RizomUV doesn't allow changing to USD format mid-project (the only format that properly supports group data).
The solution: This addon extracts and preserves RizomUV group data through a smart caching system, allowing you to safely edit meshes in Blender without losing your UV organization work.
✓ Import from RizomUV - Extract FBX with full metadata (groups, seams)
✓ Export to RizomUV - Inject UV groups back into FBX automatically
✓ Cache Management - Smart caching system for multiple projects
✓ Selected Objects Export - Export single or multiple meshes
✓ Blender 4.2+ Compatible - Tested and optimized for latest Blender
✓ File Menu Integration - Standard Blender import/export workflo
Method 1: Install from Blender (Recommended) Download the addon .zip file
In Blender: Edit → Preferences → Add-ons
Click "Install from File" → Select the .zip
Search "RizomUV" and enable the addon
Restart Blender
Method 2: Manual Installation Download the addon folder
Place in: Blender/scripts/addons/Rizom_bridge/
Enable in Blender: Edit → Preferences → Add-ons → Search "RizomUV"
Restart Blender
- RizomUV → Export FBX
- Blender → File > Import > RizomUV Bridge (Extracts UV groups to cache)
- Edit your mesh in Blender
- Blender → File > Export > RizomUV Bridge (Injects UV groups from cache)
- RizomUV → Import FBX
Important: UV groups are only preserved for objects whose topology wasn't changed in Blender.
Access via: View 3D > RizomUV Panel (sidebar)
- 1. Import FBX - Import and extract UV data
- 2. Export + Inject - Export and restore UV groups
- Cache List - Manage cached files
- Clear All Caches - Remove all cached data
In some cases, UV edges may be merged during the Blender → RizomUV export cycle. Based on my observation, this appears to be related to how the FBX format stores UV coordinates (per-vertex rather than per-face-corner, unlike Blender's internal structure).
What this means:
When exporting from Blender, vertices with multiple UV coordinates may be merged
This can result in UV seams being lost in random cases
This issue affects all Blender ↔ RizomUV workflows, not just this addon
Note: This is my interpretation of the issue based on testing. The exact cause may be more complex and involve both Blender's FBX exporter behavior and the FBX format specification.
This addon is provided free for personal and commercial use under the MIT License.
See LICENSE file for full details.
Creator: [Alta]
Website: [https://www.artstation.com/alta36]
Email: [Patryk.Dylus@gmail.com]
GitHub: [https://github.com/Alta361/FBX-Blender-Rizom-Bridge]
Version: 1.0
Last Updated: October 2025
✓ Blender 4.2 (Windows 64-bit)
✓ RizomUV 2024
✓ Windows 11
- macOS or Linux
- Other Blender and RizomUV versions
Cache Format (.dat):
- Binary format
- Contains extracted RizomUV metadata
- One cache per imported FBX
- Stored in
.cache/folder
Report Issues:
- Create detailed bug reports
- Include Blender version, OS, and steps to reproduce
- Attach small test files if possible
Want to Contribute?
- Fork the repository
- Make improvements
- Submit pull requests
Technologies:
- Blender Python API
- Autodesk FBX SDK 2020
- Windows C++
This addon is a community tool, not officially affiliated with RizomUV or Blender Foundation. Use at your own risk. Always back up your files before using with valuable projects.