List of Brush Mask Filters

Abs

Sets all pixels of an existing Brush Mask to their absolute values. An absolute value is a numerical value without regard to its sign. For example, the absolute value of 5 is 5, and the absolute value of -2 is 2.

Add

Adds the input value to each pixel in the Brush Mask.

Aspect

Uses the slope aspect of a heightmap to mask the effect of a chosen Brush, and uses Brush rotation to control the aspect direction. The aspect is the compass direction that a slope faces. This Brush is useful when you want to paint a Texture only on a slope that faces a specific direction.

Parameters

Property	Description
Strength	Controls the strength of the masking effect.
Feature Size	Specifies the scale of Terrain features that affect the mask.
Remap Curve	Remaps the concavity input before computing the final mask.

Clamp

Clamps the pixels of a mask to the specified range. Change the X value to specify the low end of the range, and change the Y value to specify the high end of the range.

Complement

Subtracts each pixel value in the current Brush Mask from the specified constant. To invert the mask results, leave the complement value unchanged as 1.

Concavity

Uses the concavity of a heightmap to mask the effect of a chosen Brush.

When you specify Recessed, Unity generates a mask based on areas of the Terrain that curve or hollow inward. As a visual representation, concave areas of the heightmap are those where you see a ∪-shape in the cross section.

When you specify Exposed, Unity generates a mask based on areas of the Terrain that curve or protrude outward. As a visual representation, convex areas of the heightmap are those where you see a ∩-shape in the cross section.

Parameters

Property	Description
Recessed / Exposed	Specifies whether to apply the mask based on recessed (concave) or exposed (convex) features.
Strength	Controls the strength of the masking effect.
Feature Size	Specifies the scale of Terrain features that affect the mask. This determines the size of features to which to apply the effect. If you specify a small value, Unity generates a mask based on smaller concave or convex parts. If you specify a large value, there need to be larger features in order for Unity to generate a mask.
Remap Curve	Remaps the concavity input before computing the final mask.

Height

Uses the height of the heightmap to mask the effect of the chosen Brush. The range is from 0 to 1, where 0 is the minimum heightmap value (black in the heightmap), and 1 is the maximum heightmap value (white in the heightmap). This is useful when you want to apply an effect only to a specific height range on the Terrain, for example, to paint grass only on areas below a certain height, or to paint snow only on areas above a specific height.

Parameters

Property	Description
Strength	Controls the strength of the masking effect.
Height Range	Specifics the height range to which to apply the effect.
Remap Curve	Remaps the height input before computing the final mask.

Max

Sets all pixels of the current mask to whichever is greater, the current pixel value or the input value.

Min

Sets all pixels of the current mask to whichever is smaller, the current pixel value or the input value.

Multiply

Multiplies all the pixels of the current mask by the input value.

Negates

Reverses the sign of all pixels in the current mask. For example, 1 becomes -1, 0 remains the same, and -1 becomes 1.

Noise

Applies noise to the Brush Mask. See the Noise Settings API documentation for more information about the actual settings stored in the Noise Settings Asset.

Power

Applies an exponential function to each pixel on the Brush Mask. The function is pow(value, e), where e is the input value.

Remap

Remaps each pixel value in the Brush Mask from the From range to the To range.

Slope

Uses the slope (first derivative) of the heightmap to mask the effect of the chosen Brush.

Parameters

Property	Description
Strength	Controls the strength of the masking effect.
Feature Size	Specifies the scale of Terrain features that affect the mask.
Remap Curve	Remaps the slope input before computing the final mask. This helps you visualize how the Terrain's slope affects the generated mask. The x-axis represents the slope angle, where 0 is equivalent to horizontal, and 1 is equivalent to vertical.