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+## turret system
+
+### design
+**upgrade graph:** <br>
+laser -> (heavy laser -> minigun) or (sniper -> railgun) <br>
+shotgun -> cannon -> tesla <br>
+plastic -> heavy plastic -> plasma plastic <br>
+slower -> (heavy slower -> final slower) or (stopper -> heavy stopper) <br>
+T generator -> kad generator -> s generator <br>
+
+---
+
+### models
+- _laser_
+- heavy laser
+- minigun
+- _sniper_
+- railgun
+- _shotgun_
+- cannon
+- tesla
+- _plastic_
+- heavy plastic
+- plasma plastic
+- _slower_
+- heavy slower
+- final slower
+- stopper
+- heavy stopper
+- _struct I_
+- _struct T_
+- _struct X_
+- _T generator_
+- kad generator
+- s generator
+- attach point
+
+### stats
+- _laser_
+- heavy laser
+- minigun
+- _sniper_
+- railgun
+- _shotgun_
+- cannon
+- tesla
+- _plastic_
+- heavy plastic
+- plasma plastic
+- _slower_
+- heavy slower
+- final slower
+- stopper
+- heavy stopper
+- _struct I_
+- _struct T_
+- _struct X_
+- _T generator_
+- kad generator
+- s generator
+- attach point
+
+### placement
+- **only place when not ovelapping**
+- **ghost cursor**
+- **buy spending resources**
+- shader to ghost cursor
+
+### targeting
+- **check visible**
+- **check range**
+- target selection
+	- **first**
+	- last
+	- strongest
+	- weakest
+	- closest
+	- further away
+	- least turning
+	- densest
+- precalculate valid path nodes
+
+### shooting
+- **spread**
+- _projectiles per shot_
+- projectile logic
+	- **bullet**
+	- _ray_
+	- **plastic**
+- projectile stats
+- projectile models
+	- bullet
+	- ray
+	- plastic
+	- bullet bounce
+	- plastic bounce
+- projectile fx
+	- trails
+	- explosions
+	- shooting particles
+
+### economy
+- **resources on enemy hit**
+- generators make resources at end of wave
+
+### upgrades
+- _turrets can be upgraded_
+- _only if can afford T_
+
+### modules
+- stats
+- logic
+- gui
+	- buy menu
+	- details
+
+### range indicator
+- model
+
+### selection indicator
+- model
+- fx
+
+### gui
+- stats details
+	- _panel with stats_
+	- upgrade bonus preview
+	- module bonus preview
+	- resize based on stats
+- **shop thumbnail**
+- on select
+	- picker options
+		- sell
+		- upgrade (multiple)
+		- target
+		- buy module
+		- manual control