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diff --git a/demos/2d/fog_of_war/troll.gd b/demos/2d/fog_of_war/troll.gd
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+++ b/demos/2d/fog_of_war/troll.gd
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+
+extends KinematicBody2D
+
+# This is a simple collision demo showing how
+# the kinematic cotroller works.
+# move() will allow to move the node, and will
+# always move it to a non-colliding spot, 
+# as long as it starts from a non-colliding spot too.
+
+
+#pixels / second
+const MOTION_SPEED=160
+
+func _fixed_process(delta):
+
+	var motion = Vector2()
+	
+	if (Input.is_action_pressed("move_up")):
+		motion+=Vector2(0,-1)
+	if (Input.is_action_pressed("move_bottom")):
+		motion+=Vector2(0,1)
+	if (Input.is_action_pressed("move_left")):
+		motion+=Vector2(-1,0)
+	if (Input.is_action_pressed("move_right")):
+		motion+=Vector2(1,0)
+	
+	motion = motion.normalized() * MOTION_SPEED * delta
+	motion = move(motion)
+	
+	#make character slide nicely through the world	
+	var slide_attempts = 4
+	while(is_colliding() and slide_attempts>0):
+		motion = get_collision_normal().slide(motion)
+		motion=move(motion)
+		slide_attempts-=1
+	
+
+func _ready():
+	# Initalization here
+	set_fixed_process(true)
+	pass
+
+