Understand Fullscreen Materials

Use the Fullscreen shader to create a custom effect that appears over the entire screen view. For example, you could use this shader to make the screen turn red when a character takes damage, or make droplets of water appear on the screen. You can see some example Fullscreen shaders in the Fullscreen shader samples.

You can then use the Fullscreen shader in the following ways:

To create a Custom Pass effect.
To create a Custom Post Process effect.
In a C# script with the HDUtils.DrawFullscreen or Graphics.Blit() functions. To use Graphics.Blit()see Make a Fullscreen material Blit compatible.

A scene of 3D shapes, with a full-screen shader that applies a raindrop effect to the screen.

A full-screen shader that applies a raindrop effect to the screen.

Refer to Create a Fullscreen Material for more information.