A simple Blender 4.4 add-on that enables Unity-style WASD fly navigation in the 3D Viewport with Shift for a speed boost.

• WASD movement: Move forward, backward, and strafing left/right.
• Shift+F to enter fly mode: Instant toggle into Unity-like free-fly.
• Speed boost: Holding Shift while flying multiplies your movement speed.
• Customizable parameters: Adjust base speed, boost factor, view height, jump height, and teleport time via code.

1. Download the plugin

   • Save the file as unity_fly_nav.py.

2. Copy to Add-ons folder

   • Windows: %APPDATA%\Blender Foundation\Blender\4.4\scripts\addons\
   • .x.x corresponds to your Blender version (e.g., 3.5, 4.4, etc.)

   macOS: ~/Library/Application Support/Blender/4.4/scripts/addons/

   Linux: ~/.config/blender/4.4/scripts/addons/

3. Enable in Blender

   • Open Blender and go to Edit → Preferences → Add-Ons.
   • Click Refresh if the list is already open.
   • Search for Unity-Style Walk/Fly Navigator and enable the checkbox.

4. Enter Fly Mode

   • In the 3D Viewport, press Shift + F to enter Unity-style navigation.
   • Use W/A/S/D to move and hold Shift to move at boosted speed.
   • Press Esc or Left Mouse Button to exit fly mode.

If you’d like to tweak the default settings, open unity_fly_nav.py and edit the following lines in the register() function:

prefs = bpy.context.preferences.inputs.walk_navigation
prefs.walk_speed        = 2.0    # Base movement speed
prefs.walk_speed_factor = 2.0    # Multiplier when holding Shift (speed boost)
prefs.view_height       = 1.6    # Camera height off the “floor”
prefs.jump_height       = 0.5    # Jump height
prefs.teleport_time     = 0.2    # Warp time on Spacebar

• walk_speed: Increase for faster base movement.
• walk_speed_factor: Increase for stronger shift-boost.
• view_height: Adjust camera height.
• jump_height: Change how high you can jump.
• teleport_time: Modify the duration of the teleport effect when pressing Spacebar.

After saving your changes, click Refresh in the Add-Ons preferences and toggle the add-on off and on to apply.

• Add-on not visible:

  • Ensure the .py file is directly in the addons folder (not nested in extra folders).
  • Make sure __init__.py is present if using a package folder structure.
  • Click Refresh in the Add-Ons preferences.

• No module named 'unity_fly_nav' error:

  • Do not manually import unity_fly_nav in Blender’s Python console. Just enable it via Preferences.

• Pref values not applying:

  • Confirm you’re editing the correct Blender version’s add-ons path.
  • Restart Blender after making changes.

Contributions and suggestions are welcome! Feel free to:

• Open an issue for bugs or feature requests.
• Submit pull requests with improvements or new features.

Please follow the project’s coding style and add clear commit messages.

This plugin is released under the MIT License. See LICENSE for details.

• v1.1: Added shift-speed boost functionality and customizable speed factor.
• v1.0: Initial release with base WASD fly navigation.