Fill Tool - rotorz/unity3d-tile-system GitHub Wiki
Flood fill area of active tile system.
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Left Click - Flood fill using primary brush.
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Right Click - Flood fill using secondary brush.
Shortcut Key: With tile system selected press G to select tool.
Fill Limit : Indicates the maximum number of tiles which should be painted when using fill tool (set to 300 by default). Filling too many tiles may cause Unity to crash; so avoid setting this option too high!
Source: topics/Fill-Tool.md