Modding:Rendering API
From Vintage Story Wiki
A thorough tutorial is still missing, but until then you can look at the same code on GitHub!
https://github.com/anegostudios/vsmodexamples/blob/master/ScreenOverlayShaderExample.cs
A thorough tutorial is still missing, but until then you can look at the same code on GitHub!
https://github.com/anegostudios/vsmodexamples/blob/master/ScreenOverlayShaderExample.cs