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Brush Blending

Priority​

When placing multiple brushes on top of each other, their priority decides in which order they get rendered and blended together. Brushes with higher priority are rendered later, thus blend on top of brushes with lower priority.

note

Brushes don't register to any single actor/list - there is no special asset that needs to be checked out when modifying them or changing their priority. As a result, multiple artists may work concurrently on different regions of a large landscape.

Brush's priority can be modified by changing its Brush Priority property (in the brush component) or by using the Priority Tool.

Priority Tool​

Priority Tool shows the list of brushes ordered by their priority. Priority can be changed by drag & dropping a brush on the list or by typing brush priority directly.

Brush names are displayed using their visualization colors.

Priority is crucial when using the Replace Blend Method.

Blend Modes​

There are several ways to combine brushes. Depending on your needs, you may want to merge heightmaps, replace weightmaps, or use min/max operations on your biome masks.

Add and Subtract​

This is the default mode, allowing brushes to blend through simple addition.

Only Add/Subtract​

This mode is akin to the Add and Subtract mode but allows you to restrict the blending effect to either addition or subtraction.

Replace​

This mode replaces everything below your brush with the brush itself. The contents underneath are determined by brush priority, as discussed in the priority section.

Min/Max​

This mode retains only the highest or lowest values from both the brush and the combined landscape and brushes beneath it. It's particularly effective for blending brushes when you want to exclusively raise or lower the landscape.

Replace If Over/Under Threshold​

This advanced blending mode allows you to replace the landscape below only if the value in your current brush exceeds or falls short of a specified threshold. It's useful for ensuring that the shape of your mask replaces the landscape precisely, as a square replacement would occur without a falloff.