These are volumetric clouds created using nodes rendered in EEVEE, the entire scene is rendered in real time.
Below is the viewport rendering the scene and the world node graph.
![](https://darryldias.com/wp-content/uploads/clouds.003_blender_viewport-1024x601.png)
These are volumetric clouds created using nodes rendered in EEVEE, the entire scene is rendered in real time.
Below is the viewport rendering the scene and the world node graph.