Take in-game screenshots without visible pauses or frame time spikes. Queues screenshots and writes them to time stamped files in user directory in a separate thread. Made for Godot 3.x.
Copy the screenshotqueue.gd -file to your project directory and set it as auto-loaded script (singleton) in project settings. Then all you need in code is this (assuming you named the singleton ScreenshotQueue):
ScreenshotQueue.snap(get_viewport())
MIT license.
This was initially made for use in Polychoron game project.