Set Default Orientation - rotorz/unity3d-tile-system GitHub Wiki
Home | Brushes | Oriented Brushes
Each oriented brush has a default orientation which is marked using the radio button towards the left.
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Right-click brush using Brush palette and select Show in Designer... from menu.
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Click radio button at left of orientation to mark as default.
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Fallback Orientation
Default orientation is assumed when actual orientation of tile is not defined within brush (or next best was not matched). The default orientation is also used to generate preview for brush.