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Brush tool (B hotkey) is used for painting arbitrary shapes on a texture.
All available settings are described in the Texture Editor article. However, there is a specific Draw Blend Mode parameter that sets a blending mode for the brush:
- Alpha Blend — override the existing color with the current color.
Add — add the current color to the existing color value. This mode can be useful when painting a height map.Alpha Blend ModeAdd Mode
- Minimum — override the existing color with the current color only if it has a lower value.
Maximum — override the existing color with the current color only if it has a higher value. This mode can be used, for example, when you need to increase low values in a height map by no more than a certain value.Minimum ModeMaximum Mode