Modding:Rendering API
From Vintage Story Wiki
A thorough tutorial is still missing, but until then you can look at the sample code on GitHub!
- Setting up a custom Shader: https://github.com/anegostudios/vsmodexamples/blob/master/ScreenOverlayShaderExample.cs
- Rendering a HUD Element: https://github.com/anegostudios/vsmodexamples/blob/master/HudOverlaySample.cs