2019-10-07

[public] 892K views, 62.0K likes, 188 dislikes audio only

Sebastian Lague

Clouds are lovely and fluffy and rather difficult to make.

In this video I attempt to create clouds from code in the Unity game engine.

Project source (Unity, HLSL, C#) is now out of early access:

https://github.com/SebLague/Clouds

If you'd like to support the creation of more videos like this, please consider becoming a patron:

https://www.patreon.com/SebastianLague

Learning Resources:

http://killzone.dl.playstation.net/killzone/horizonzerodawn/presentations/Siggraph15_Schneider_Real-Time_Volumetric_Cloudscapes_of_Horizon_Zero_Dawn.pdf

http://www.diva-portal.org/smash/get/diva2:1223894/FULLTEXT01.pdf

http://patapom.com/topics/Revision2013/Revision%202013%20-%20Real-time%20Volumetric%20Rendering%20Course%20Notes.pdf

https://www.gamedev.net/forums/topic/680832-horizonzero-dawn-cloud-system/

Assets:

Mouse flight: https://github.com/brihernandez/MouseFlight

Plane model: https://www.turbosquid.com/FullPreview/Index.cfm/ID/1041070

Music:

"Hypnothis" and "The Show Must Be Go" by Kevin MacLeod (incompetech.com)

Licensed under Creative Commons: By Attribution 3.0 License

http://creativecommons.org/licenses/by/3.0/

Notes:

I made a mistake at 2:12 in saying that the closest point is guaranteed to be inside the adjacent cells, it’s possible to get arrangements where the nearest point is two cells away orthogonally. This doesn’t seem to occur much as I never noticed any discontinuities in the result, but worth knowing.

Chapters:

0:00 Intro

0:56 Worley Noise

3:12 Image Effects

3:50 Raytracing... a Box!

5:14 Raymarching Cloud-ish Shapes

7:10 Light Scattering Theory

8:26 Mishap Montage

9:22 Final Code

9:44 Cloud Editor

11:31 Final Demo: Flying Through the Clouds