Procedural Sky

The Procedural Sky Volume component override lets you specify the type of sky that HDRP generates. For example, you can set up the sun size, ground color and sky tint.

This sky is similar to the procedural sky in Unity’s built-in render pipeline. It differs as it includes extra properties that the built-in render pipeline lacks. HDRP’s Procedural Sky exposes a Multiplier, Update Mode properties, and the option to include the sun in HDRP’s baking process.

Using Procedural Sky

Procedural Sky uses the Volume framework, so to enable and modify Procedural Sky properties, you must add a Procedural Sky override to a Volume in your Scene. To add Procedural Sky to a Volume:

1. Select the Volume component in the Scene or Hierarchy to view it in the Inspector.
2. In the Inspector, navigate to Add Override > Sky and click on Procedural Sky.

After you add a Procedural Sky override, you must set the Volume to use Procedural Sky. The Visual Environment override controls which type of sky the Volume uses. In the Visual Environment override, navigate to the Sky section and set the Type to Procedural Sky. HDRP now renders a Procedural Sky for any Camera this Volume affects.

Properties

Property	Description
Enable Sun Disk	Makes HDRP display the sun disk defined by the Sky Size, Sun Size Convergence, Exposure, and Multiplier .
Sun Size	The size modifier of the sun disk.
Sun Size Convergence	The size convergence of the sun, smaller values make the sun appear larger.
Atmospheric Thickness	The density of the atmosphere, an atmosphere of higher density absorbs more light.
Sky Tint	The color of the sky.
Ground Color	The color of the ground (the area below the horizon).
Exposure	The exposure HDRP applies to the Scene as environmental light. HDRP calculates the environment light in your Scene using 2 to the power of your Exposure value.
Multiplier	The multiplier HDRP applies to the Scene as environmental light. HDRP multiplies the environment light in your Scene by this value.
Update Mode	Controls the rate at which HDRP updates the sky environment (using Ambient and Reflection Probes). • On Changed: Makes HDRP update the sky environment when one of the sky properties changes. • On Demand: Makes HDRP wait until you manually call for a sky environment update from a script. • Realtime: Makes HDRP update the sky environment at regular intervals defined by the Update Period.
- Update Period	The period (in seconds) at which HDRP updates the sky environment when you set the Update Mode to Realtime. Set the value to 0 if you want HDRP to update the sky environment every frame.