How to get a nice Glow effect in Godot ( + Post-Processing & World Environment Node )

Today I want to post a really quick tutorial as I get these questions so often: How to get a nice glow effect in Godot? Why has the glow artifacts? Why is the glow blocky? Why is the glow stuttering and flickering?

I decided the quickest way to answer all this is to make this short video and to supply you with an example project.

You can find the source / example for the complete project in a GitHub repository here:
https://github.com/RPicster/Godot-Glo...

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Timestamps:
00:00 Intro
00:08 Let's get started!
00:25 WorldEnvironment - Adjustments (Color Correction)
01:10 WorldEnvironment - Glow
01:42 Glow - Fix Blockyness
01:52 Glow - Blend Modes
02:25 Glow - Fix Flickering ( Glow Levels )
03:15 Glow - Fix Intensity
03:27 Glow - Bloom
03:45 Glow - HDR Threshold
04:30 Glow - HDR Luminance Cap
06:40 Saving one Powerful Color as a Preset
07:42 HDR Colors get multiplied, too!
08:14 Linear vs Dynamic(HDR) Post-Processing
08:55 Outro


Music by https://chillhop.com:
Plusma, Von Wegen - sopha
Saib - Beyond Clouds
Tesk - Doin It