This provides a small framework to prototype ideas, especially regardings multi-selection in games.

• a world with many units
• each unit has a 2D position
• each unit can have a behavior tree
• a simple 3D scene lets you explore the situation
• a simple behavior tree editor lets you toy around with unit behavior

• there is only one selection
• there is only one highlight (units in the center)
• create groups by assigning a group id to the selection
• create selections by adding/removing highlighted units to the selection
• there is a target cursor which can be turned on/off