Random Material Viewport Visualizer

A Blender extension that helps you visualize material assignments in the viewport by randomly assigning distinct colors to materials and highlighting objects without materials.

Features

• Randomize Material Colors: Automatically assigns vibrant, distinguishable colors to all materials in the viewport
  • Uses HSV color space for optimal color distribution
  • High saturation colors ensure distinction from Blender's default gray
  • Random starting hue for varied color combinations each time

• Highlight Missing Materials: Detects and highlights mesh objects that have no materials assigned
  • Assigns a bright magenta warning material (!WARNING_MISSING!)
  • Works for both empty material slots and completely missing materials
  • Visual feedback to quickly identify problematic objects

Installation (Blender 4.2.0+)

1. Download the extension as a ZIP file (in Release page)
2. Open Blender and drag ZIP file into viewport
3. Select a repository (e.g. User Default)
4. Toggle on Enable Add-on and click OK
5. The extension will be installed and enabled automatically

Usage

1. Open the Tool panel in the 3D Viewport sidebar (press N to toggle sidebar)
2. Find the Random Material Viewport Visualizer panel

Tips

• Run "Randomize Colors" multiple times to get different color combinations
  • The warning material (!WARNING_MISSING!) will always remain magenta
• Colors are only changed in viewport display, not in actual material properties for rendering
• Works best with viewport shading set to Solid mode with Material color type

Requirements

• Tested on Blender 4.5.0
• Not sure whether can run on lower version

License

GPL-3.0-or-later

Author

aoirusann@gmail.com