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The Rock texture map can be used to generate a procedural rock texture. It uses two colors that can have texture maps assigned to them.

Color A – Controls the first color used by the Rock procedural. You can assign a texture map to this channel, which overrides the color if the checkbox is enabled.  

Color B – Controls the second color used by the Rock procedural. You can assign a texture map to this channel, which overrides the color if the checkbox is enabled.  

Grain Size – Controls the size of the fine grain features. 

Diffusion – Lower values make the resulting texture sharper, while higher values blur the texture details more.

Mix Ratio – Controls the mix between Source A and Source B.

Color Manipulation

Invert Texture – Inverts the RGB texture values.

Alpha from Intensity – Uses the texture RGB intensity/luminance as alpha channel.

Color Gain – Corrects the color of the texture by multiplying the the RGB color values in the texture with the RGB color values specified here. When a texture is selected, it overrides the color as long as the texture checkbox is enabled.  

Color Offset – Corrects the color of the texture by adding the RGB color values specified here to the RGB color values in the texture. When a texture is selected, it overrides the color as long as the texture checkbox is enabled. 

Default Color – Specifies a default color used for polygons with no valid UVs. In case the map is not tiled, specifies a default color that is used outside the texture square.  When a texture is selected, it overrides the color as long as the texture checkbox is enabled.

Mode – Specifies the multiplication mode of the colors. 

Multiply – The color used for blending is black.
Blend Amount–  The color used for blending is the one specified in the color slot.

Color A – Blends between a color and a texture, if specified. 

Color B – Blends between a color and a texture, if specified.