Common Brush Properties - rotorz/unity3d-tile-system GitHub Wiki
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Some properties are common between brush types which are located at top of brush designer interface.

Used when naming the brush asset and is presented in brush lists.
Tip - Do not forget to click the Rename button once you have finished altering the brushes name.
Indicates whether tiles painted using brush can be optimized when building tile systems.
See Optimization for more information.
Indicates whether normals of tiles painted using brush should be smoothed when optimizing tile systems. This can help to avoid lighting artifacts where tiles join one another.
Note - Smoothing can only be enabled for static brushes.
Allows brushes to be hidden or favored within brush list views, most specifically within the Brushes palette.
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Shown - Shown by default.
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Hidden - Hide from brush lists (except designer window).
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Favorite - Favorite brushes are shown plus can be filtered, and favored tileset brushes will appear under the Brushes list view.
Specify tag and layer that should be assigned to painted tiles.
These properties must be explicitly overridden for certain brush types. With oriented brushes this is useful because it allows the user to decide whether to override values for all tiles, or alternatively allows the user to define values on a per tile basis.

Specifies the category that the brush belongs to. Categories help you to organize your brushes so that they are easier to scroll through when you have large tile sets.
You can define categories using the category manager which can be accessed via by selecting Manage Categories from the popup menu (see Brush Categories).