Volumetric Fog Demo

Volumetric fog in Godot using particles.

Usually, volumetric fog is done as a post processing effect, but here's an example on how to do it with particles.

This has the following advantages:

• very easy to implement, automatically works with GI if you place a GIProbe around it
• can easily change the texture of the fog
• can easily animate the fog, can e.g. apply wind, attractors, and random movement

But it has disadvantages as well:

• it's very slow
• because the particles are billboards, rotating the camera results in the fog rotating as well, which looks weird
• only works in a small region of space, unless you parent the fog emitter to the camera (which only looks nice if the camera moves slowly)
• doesn't work if light is pointing towards the camera (since the particle normal points towards the camera as well)
• probably looks bad if the ambient/background color isn't black

Here's a video of it in action.

Made with Godot 3.0 alpha1.