How to Randomize Colors in Blender with Object Info Node

Randomizing object colors in Blender is a quick way to add visual variety to duplicated meshes, particle systems, or instanced geometry without creating multiple unique materials. By combining the Random output of the Object Info node with a ColorRamp node inside the Shader Editor, you can instantly assign different colors to every object sharing the same material.

Step-by-Step Guide to Randomizing Object Colors

1. Assign a Single Material to Multiple Objects

Select all the objects you want to randomize in your 3D Viewport. Add a new material to one object, then press Ctrl + L and select Link Materials to apply that same material to all selected objects.

2. Open the Shader Editor

Switch your workspace to the Shader Editor tab (or open a Shader Editor window). Make sure the material you just assigned is selected and active.

3. Add the Object Info Node

  1. Press Shift + A inside the Shader Editor to open the Search menu.
  2. Search for Object Info and press Enter to place the node.

4. Add a ColorRamp Node

  1. Press Shift + A again.
  2. Search for ColorRamp and place it between the Object Info node and your Principled BSDF node.

5. Connect the Nodes

Connect the sockets as follows:

  • Object Info (Random) \(\rightarrow\) ColorRamp (Fac)
  • ColorRamp (Color) \(\rightarrow\) Principled BSDF (Base Color)

At this point, Blender generates a unique random value between 0.0 and 1.0 for each separate object. The ColorRamp translates that value into a color along your defined gradient.

Customizing the Color Distribution

Smooth Color Transitions (Gradients)

By default, the ColorRamp interpolation is set to Linear. This creates a smooth gradient transition, giving your objects varying shades between the color stops set on the ramp.

Distinct, Solid Colors

If you want each object to pick one solid color from a specific palette rather than a gradient mix:

  1. Click the Interpolation dropdown on the ColorRamp node (defaults to Linear).
  2. Change it to Constant.
  3. Add more color stops using the + button on the ColorRamp and set each stop to your desired color.

Working with Linked Duplicates and Instances

  • Linked Duplicates (Alt + D): The Object Info node recognizes linked duplicates as individual objects, meaning each duplicate gets its own random color automatically.
  • Geometry Nodes / Particle Systems: If you are instancing objects via Geometry Nodes or a Particle System, ensure you check Realize Instances (in Geometry Nodes) if you want the Object Info node to treat each instance as an individual object, or use the Instance Info node for native instanced color variation.