Blender Add-on That Assign a Custom Color to a Material

• Download the latest ZIP from Releases.
• Install via Edit > Preferences > Add-ons > Install….

Once activated, a panel named Quick Material Colors will appear in the MAT tab in the 3D viewport sidebar.

• Select an object in your view, and click one of the buttons to assign that color to it.
• Set the Rename Material checkbox to True to change the material or world name.
• Set the All Selected Materials checkbox to True to change the Base Color of all selected shader nodes in a material. (This ignores nodes that do not have a Base Color attribute.)
• Set the World Background checkbox to True and the button will assign that color to the World > Background Shader > Color.

This add-on does one very specific thing:

It sets the Base Color of the following Nodes to a custom color.

• A Principled BSDF Shader node specifically named Principled BSDF -- which is created by default with all new materials
• A Diffuse BSDF Shader named Diffuse BSDF
• The Blender QMM Plaster material
• The current World's Background Shader named Background

It also sets the material or the world's Viewport Display > Color to the same color.

This add-on will only affect the Active Material of the Currently Selected Object.

The operation will fail if:

• No object is selected
• The active object has no material
• The active material does not include a Principled BSDF Shader named Principled BSDF or a Diffuse BSDF Shader named Diffuse BSDF

If the operation fails, set the All Selected Nodes checkbox to True, and manually select the shader nodes you want to change.

And if no World is set, changing the World Background will cause an error.

For swatches and notes, refer to the Wiki.