Enemy bullets deflect off of surfaces

Bullet.gd

@@ -1,4 +1,4 @@
-extends Spatial
+extends KinematicBody
 
 
 var target := Vector3.ZERO
@@ -9,20 +9,20 @@ var velocity := Vector3.ZERO
 export var acceleration_factor = 5.0
 export var accelerating := false
 
-
-func _ready():
-	$HitArea.connect("body_entered", self, "_on_hit_body")
+export var coefficient_of_restitution := 0.5
 
 
-func _on_hit_body(body):
-	if body.name == "Player":
-		print("Player hit!")
-
-
-func _process(delta):
+func _physics_process(delta):
 	if accelerating:
 		var direction = (target - global_transform.origin).normalized()
 		acceleration += direction * acceleration_factor * delta
 		velocity += acceleration
 	
-	global_transform.origin += velocity * delta
+	var collision = move_and_collide(velocity * delta)
+	
+	if collision:
+		var normal = collision.normal
+		velocity = coefficient_of_restitution * (velocity - 2 * velocity.dot(normal) * normal)
+		
+		if collision.collider.name == "Player":
+			print("Player hit!")

ShootyEnemy.gd

@@ -11,7 +11,7 @@ var bullet_scene = preload("res://Bullet.tscn")
 var bullet_velocity = 40.0
 
 var target
-var velocity := Vector3(0.0, 5.0, 10.0)
+var velocity := Vector3(0.0, 1.0, 1.0)
 
 
 func _ready():
@@ -40,7 +40,7 @@ func shoot_bullet():
 	var instance = bullet_scene.instance()
 	get_tree().get_root().add_child(instance)
 	
-	instance.global_transform.origin = global_transform.origin
+	instance.global_transform.origin = global_transform.origin - global_transform.basis.z
 	instance.velocity = velocity + (target - global_transform.origin).normalized() * bullet_velocity