Fog Volume Master Stack reference

The Fog Volume master stack refers to the settings and contexts that the Fog Volume shader graph(fog-volume-shader.md) includes by default.

To use this master stack, set up a Fog Volume in your scene.

An example of a Fog Volume shader graph used to create smoke at ground level.

Contexts

A Shader Graph contains the following contexts:

Vertex context
Fragment context

The Fog Volume Master Stack has its own Graph Settings that determine which blocks you can use in the Shader Graph contexts. For more information about the relationship between Graph Settings and blocks, refer to Contexts and blocks.

This section contains information on the blocks that this master stack material type uses by default, and which blocks you can use to affect the Graph Settings.

Vertex context

Fragment context

Default

Property	Description	Setting Dependency	Default Value
Base Color	The base color of the material.	None	Color.grey
Alpha	The Material's alpha value. This determines how transparent the material is. The expected range is 0 - 1.	None	1.0

Note: The Alpha block controls the density of the fog. HDRP combines the alpha value with the Local Volumetric Fog’s Fog Distance value to compute the fog.

Graph Settings

The properties in the Graph Settings window control the appearance of the Fog Volume shader.

Surface Options

Property		Description
Fog Volume Options
	Blend Mode	Control how this fog volume shader blends with existing fog in the scene: • Overwrite: Replaces existing fog in the volume area with this fog shader. • Additive: Adds the color and density of this fog shader to other fog in the scene. This is the default value. • Multiply: Multiplies the color and density of this fog shader with other fog in the scene. You can use this to create effects relative to a specific fog density. • Min: Determines the minimum density value of this fog shader and the scene fog inside its bounding box. For example, a value of 0 appears to remove fog in a certain area. • Max: Controls the maximum density value of this fog shader and the scene fog inside its bounding box.
Custom Editor GUI		The class you use to define a custom window for the unity editor or custom material Inspector values or properties. A Custom Editor GUI class might replace default properties. For more information, refer to Custom material Inspectors.

Material Inspector Settings

These settings appear when you select the Fog’s material in the Asset window.

Property		Description
Fog Volume options
	Single Scattering Albedo	Control the color of each fog particle. The fog’s density doesn’t affect this color.
	Fog Distance	Control how far you can see through the fog in meters. This controls how far the light passes through fog to affect how opaque it appears. A value of 0 makes the fog appear opaque.
	Blend mode	Determine how this fog shader blends with existing fog in the scene. This property overwrites the Blend mode you set in the Surface Options: • Overwrite: Replaces existing fog in the volume area with this fog shader.Presented content strategy initiatives to leads in key team meetings.•Additive: Adds the color and density of this fog shader to other fog in the scene. This is the default value. Multiply: Multiplies the color and density of this fog shader with other fog in the scene. You can use this to create effects relative to a specific fog density. • Min: Determines the minimum density value of this fog shader and the scene fog inside its bounding box. For example, a value of 0 appears to remove fog in a certain area. • Max: Determines the maximum density value of this fog shader and the scene fog inside its bounding box.