puree-ui 0.1.0

XWZ Puree UI framework for Blender

A declarative UI framework for Blender addons and much more

Puree UI for Blender is a declarative framework that provides a web-inspired API for building user interfaces, addressing the limitations of Blender's native UI system in supporting complex interface architectures and providing enhanced flexibility.

It's meant for all Blender users that want to enhance their ability to present their creations, models, addons and products inside the software in a streamlined, easy & intuitive way, adaptable to causal users and powerful enough for seasoned programmers.

Puree is built on top of ModernGL, TinyCSS2, and Stretchable to deliver a high-performance, GPU-accelerated UI engine with a familiar web development paradigm.

What is puree good for?

From addon user interfaces to complex object-based tracking in screen space, to interactive tutorials, to markdown-type (and soon true markdown rendering!) rendering directly in Blender, to simple drawing anywhere in Blender, in real-time, using the gpu. Check the examples folder for detailed examples of what can be accomplished with puree.

Key Features

Feature	Description
Declarative UI Design	Define your interface structure using YAML configuration files with HTML-like nesting
GPU-Accelerated Rendering	Leverages ModernGL compute shaders for real-time, high-performance UI rendering
Responsive Layouts	Automatic layout computation using the Stretchable flexbox engine
Interactive Components	Built-in support for hover states, click events, scrolling, and toggle interactions
Web-Inspired Architecture	Familiar paradigm for developers coming from web development

Quick Start

Here's a minimal example to get you started with Puree:

[!IMPORTANT] It's not recommend to install dependencies with pip in the blender python context, so better download the puree wheel and it's dependencies, and reference them in the blender_manifest.toml file of your addon.

1. Download the package with pip or download the latest release

   pip download --only-binary=:all: --python-version 3.11 --dest wheels puree-ui
   

2. Create your project structure:

   my_addon/x
       ├── static/
       │   ├── index.yaml
       │   └── style.css
       └── __init__.py <-- your addon entry point
   

3. Define your addon manifest in blender_manifest.toml:

   Rename the blender_manifest.example.toml to blender_manifest.toml and modify to fit your addons metadata.

   schema_version = "1.0.0"
   
   id         = "your_addon_id"
   version    = "your_addon_version"
   name       = "your_addon_name"
   tagline    = "your_addon_tagline"
   maintainer = "your_name"
   type       = "add-on"
   
   blender_version_min = "your_addon_version_blend_min"
   
   license = [
   "your_addon_license",
   ]
   
   platforms = [
   "windows-x64",
   "linux-x64",
   "macos-arm64",
   "macos-x64"
   ]
   
   wheels = [
   "./wheels/attrs-25.3.0-py3-none-any.whl",
   "./wheels/glcontext-3.0.0-cp311-cp311-win_amd64.whl",
   "./wheels/linkify_it_py-2.0.3-py3-none-any.whl",
   "./wheels/markdown_it_py-4.0.0-py3-none-any.whl",
   "./wheels/mdit_py_plugins-0.5.0-py3-none-any.whl",
   "./wheels/mdurl-0.1.2-py3-none-any.whl",
   "./wheels/moderngl-5.12.0-cp311-cp311-win_amd64.whl",
   "./wheels/platformdirs-4.5.0-py3-none-any.whl",
   "./wheels/puree_ui-0.0.8-py3-none-any.whl",
   "./wheels/pygments-2.19.2-py3-none-any.whl",
   "./wheels/PyYAML-6.0.2-cp311-cp311-win_amd64.whl",
   "./wheels/rich-14.1.0-py3-none-any.whl",
   "./wheels/stretchable-1.1.7-cp38-abi3-win_amd64.whl",
   "./wheels/textual-6.2.1-py3-none-any.whl",
   "./wheels/tinycss2-1.4.0-py3-none-any.whl",
   "./wheels/typing_extensions-4.15.0-py3-none-any.whl",
   "./wheels/uc_micro_py-1.0.3-py3-none-any.whl",
   "./wheels/webencodings-0.5.1-py2.py3-none-any.whl"
   ]
   
   [build]
   paths_exclude_pattern = [
   "__pycache__/",
   "*.zip",
   "*.pyc",
   ".gitignore",
   ".vscode/",
   ".git/",
   ]
   

4. Define your addon entrypoint in __init__.py:

   Rename the __init__.example.py to __init__.py and modify to fit your addons metadata.

   import bpy
   import os
   from puree import register as xwz_ui_register, unregister as xwz_ui_unregister
   from puree import set_addon_root
   
   bl_info = {
       "name"       : "your_addon_name",
       "author"     : "your_name",
       "version"    : (1, 0, 0),
       "blender"    : (4, 2, 0),
       "location"   : "3D View > Sidebar > Your Addon",
       "description": "Your addon description",
       "category"   : "Your Addon Category"
   }
   
   def register():
       # Set the addon root directory so puree knows where to find resources
       set_addon_root(os.path.dirname(os.path.abspath(__file__)))
       # Register the framework
       xwz_ui_register()
       # Set default properties
       # ui_conf_path is relative to the addon root directory and
       # is required to point puree to the main configuration file of your UI
       wm = bpy.context.window_manager
       wm.xwz_ui_conf_path = "static/index.yaml"
       wm.xwz_debug_panel  = True
       wm.xwz_auto_start   = True
   
   def unregister():
       # Unregister the framework
       xwz_ui_unregister()
       
   if __name__ == "__main__":
       register()
   

5. Define your UI in index.yaml:

   app:
     selected_theme: default
     default_theme: default
     theme:
       - name: default
         author: you
         version: 1.0.0
         default_font: NeueMontreal-Regular
         styles:
           - static/style.css
         scripts: []
         components: ""
         root:
           style: root
           hello:
             style: hello_box
             text: Hello, Puree!
   

6. Style it in style.css:

   root {
       width          : 100%;
       height         : 100%;
       display        : flex;
       align-items    : center;
       justify-content: center;
   }
   
   hello_box {
       width           : 300px;
       height          : 100px;
       background-color: #3498db;
       border-radius   : 10px;
       text-color      : #ffffff;
       text-scale      : 24px;
   }
   

7. Zip the files.

8. Install in Blender: Edit > Preferences > Add-ons > Install from disk

9. Done. If you open the latest version of Blender you have installed on your system you should see a puree tab in the N-panel of the 3D Viewport - click the button and you will see a blue rectangle with text.

How it works

Puree follows a render pipeline inspired by modern web browsers:

1. Parse – YAML/CSS files are loaded and parsed into container tree with styles
2. Layout – Stretchable computes flexbox layouts with viewport-aware sizing
3. Compile – Optional Python scripts transform the UI tree
4. Render – ModernGL compute shader generates GPU texture with all visual effects
5. Event – Mouse/scroll events update container states and trigger re-renders

graph LR
    A[YAML + CSS] --> B[Parser]
    B --> C[Container Tree]
    C --> D[Stretchable Layout]
    D --> E[Flattened Data]
    E --> F[GPU Buffers]
    F --> G[Compute Shader]
    G --> H[UI Texture]
    
    I[Mouse/Scroll] --> J[Event Handlers]
    J --> K[Hit Detection]
    K --> C
    
    L[Python Scripts] --> M[Compiler]
    M --> C
    
    H --> N[Blender Viewport]
    
    style A fill:#000
    style C fill:#000
    style D fill:#000
    style G fill:#000
    style H fill:#000
    style K fill:#000

This architecture enables:

• Reactive updates – Layout recomputes on viewport resize
• GPU acceleration – All rendering in compute shaders
• Script integration – Python scripts can modify UI at runtime
• Event propagation – Interactions flow through container hierarchy

[!TIP] Read the full documentation for detailed guides, API references, and examples.

Support & Issues

[!WARNING]

puree is in beta - WIP

• puree currently works only with Blender's OpenGL backend because of the ModernGL dependency.
• The API is not stable and breaking changes are expected in future releases.

Getting Help

For questions and support, check out the docs or support guide.

Reporting Issues

Found a bug or have a feature request? Open an issue with:

• Clear description of the problem or feature
• Steps to reproduce (for bugs)
• Blender version and OS
• Relevant error messages or screenshots

Built With

   

   

       

Special thanks to the open-source community and the developers behind the projects that make puree possible.