Unity Transparent Window

A simple utility script that lets you build applications with a transparent background, allowing users to see through and click through the window.

Note

While this script was primarily written for UnityEngine, it should also work for regular C# programs, as no Unity library was used.

Important

Since the script uses functions from user32.dll, it is only usable on Windows systems

Features

This script comes with 3 modes to choose from:

• Chroma

  • Designate a color (eg. green) to be cut out
  • Areas originally to be rendered with that color, either from UI or objects, will become see-through and click-through
  • For 3D scenes, remember to take lighting into account
  • Does not support half-transparency (eg. feathered edges of a sprite)

• Manual

  • Turn the entire screen transparent based on alpha (eg. set the A channel of the Camera's Background to 0)
  • Manually control when the program is click-through via code
  • Support half-transparency

• None

  • If you just want to hide the Taskbar icon

Extras

Some additional features

• Always on Top

  • Make the program continue to stay on the screen after the user clicks on other windows underneath (ie. overlay effect)
  • For UnityEngine, enable the Run in Background player setting to let the program continue running

• Hide Taskbar

  • Hide the icon of the program in the Taskbar
  • You will need to kill the process via Task Manager, if you did not set up a close button and lost focus to the program

Prerequisite for Unity

These requirements only concern UnityEngine

• Disable the Flip Model Swapchain under Resolution and Presentation in the Player settings
• Only the built-in (a.k.a legacy, standard, etc.) render pipeline is supported

Important

To prevent breaking the Editor, this script only functions when actually built

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• Reference: Video by. CodeMonkey