Fixed Brush Size for Texture Paint — Documentation

Installation

1. Open Blender and navigate to Edit > Preferences from the top menu.

2. Click on the Add-ons tab on the left side of the window.

3. Click the Install... button in the top right corner, select the downloaded Fixed_Brush_Size_for_Texture_Paint.py file, and click Install Add-on.

4. Find the add-on in the list and check the box next to it to enable it.

How to Use

The add-on is designed with a "set and forget" philosophy to keep your workflow completely seamless. There is no need to look for any extra panels or buttons:

• Automatic Activation: Every time you launch Blender or open a new scene, the add-on starts running silently in the background.

• Usage: The moment you switch to Texture Paint mode in the 3D Viewport, your brush size automatically locks to the 3D space.

• No matter how close you zoom in or how far you zoom out, the real-world scale (size) of the brush stroke left on the model surface remains exactly the same.

• If you want to change the brush size, you can continue using the standard F shortcut as usual; the add-on will instantly adapt and lock to your new brush size.

Compatibility & Notes

• Version Support: Thanks to its backward-compatible API check structure, it is fully compatible with Blender 4.5, 5.0, and 5.1+.

• Performance: The background modal timer system is highly optimized to run at millisecond intervals, ensuring zero impact on Blender's native performance.