Cloudy fog effect

[KuriMC606]

New fog type with nlRenderVolFog function, uses ray matching on this fog to appear randomly and move on the map, similar to Rain Mist and this photo

[KuriMC606]

Is this possible?

[devendrn]

Would be quite hard to make something similar to that

[devendrn]

This is a good suggestion, but I'm not sure how the result will turn out to be. Two ways I think this could be implemented are:

Approach 1 (Realistic):

1. Use worldPos and cPos to somehow get tiledWorldPos.
2. Create a 3D tiled noise pattern (add linear waves to get motion)
3. Add fog fade to 3d noise
4. Raymarch volumetrics
5. Mix with actual fog

Approach 2 (Just fake it):

1. Make some good looking noise pattern
2. Add it to fog

Approach 1 isn't really suited for this shader, but it's possible.

[KuriMC606]

I think you add it and add a config line to toggle between the two approach and turn it on and off

[1Sekon]

does Approach 1 is possible to do in vertex shader?
i know noise is possible but how about for() function?

[devendrn]

Approach 1 is possible to do in vertex shader?

Yes, its possible. But it will look a little weird when you move because of interpolation. As example, look at the cloud/aurora reflection on water in this shader.

how about for() function?

Yes you can use any control statement in vertex shader. See GLES 2.0 Reference card to understand GLSL more.