add selection hove indicator and make selection on mouse release

assets/textures/selection_unit_hover_decal.png.import

@@ -0,0 +1,35 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://duf132faskeid"
+path.s3tc="res://.godot/imported/selection_unit_hover_decal.png-3405fd7bd28aecc3a58787620fa15847.s3tc.ctex"
+metadata={
+"imported_formats": ["s3tc_bptc"],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://assets/textures/selection_unit_hover_decal.png"
+dest_files=["res://.godot/imported/selection_unit_hover_decal.png-3405fd7bd28aecc3a58787620fa15847.s3tc.ctex"]
+
+[params]
+
+compress/mode=2
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=true
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=0

scenes/units/test_unit.tscn

@@ -1,8 +1,9 @@
-[gd_scene load_steps=5 format=3 uid="uid://cfixshlmwhpmi"]
+[gd_scene load_steps=6 format=3 uid="uid://cfixshlmwhpmi"]
 
 [ext_resource type="Script" path="res://scripts/units/test_unit.gd" id="1_e76lg"]
 [ext_resource type="PackedScene" uid="uid://bi231xk2sp410" path="res://assets/models/ant.glb" id="1_ff64u"]
 [ext_resource type="Texture2D" uid="uid://dehqm00kiljut" path="res://assets/textures/selection_unit_decal.png" id="2_5725f"]
+[ext_resource type="Texture2D" uid="uid://duf132faskeid" path="res://assets/textures/selection_unit_hover_decal.png" id="4_umx1w"]
 
 [sub_resource type="SphereShape3D" id="SphereShape3D_e8dcp"]
 radius = 0.25
@@ -23,7 +24,13 @@ pixel_size = 0.0055
 axis = 1
 texture = ExtResource("2_5725f")
 
-[node name="NavigationAgent3D" type="NavigationAgent3D" parent="." index="4"]
+[node name="HoverSprite" type="Sprite3D" parent="." index="4"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, -0.0021804, 0.00953716, -0.00236732)
+pixel_size = 0.0085
+axis = 1
+texture = ExtResource("4_umx1w")
+
+[node name="NavigationAgent3D" type="NavigationAgent3D" parent="." index="5"]
 path_desired_distance = 0.5
 target_desired_distance = 0.5
 path_height_offset = 0.5

scripts/selector.gd

@@ -50,9 +50,11 @@ func _input(event: InputEvent) -> void:
 		var button_event := event as InputEventMouseButton
 		if button_event.button_index == MOUSE_BUTTON_LEFT:
 			mouse_pressed = button_event.pressed
-			if button_event.pressed:
+			if mouse_pressed:
 				selection_rect.position = button_event.position
 				selection_rect.size = Vector2.ZERO
+			else:
+				_set_selection_state(false)
 	
 	if event is InputEventMouseMotion and mouse_pressed:
 		var motion_event := event as InputEventMouseMotion
@@ -93,6 +95,10 @@ func _handle_unit_selection() -> void:
 	if not selecting:
 		return
 	
+	_set_selection_state(true)
+
+
+func _set_selection_state(hover: bool) -> void:
 	var rect_abs := selection_rect.abs()
 
 	for unit: Node3D in visible_units.values():
@@ -101,7 +107,11 @@ func _handle_unit_selection() -> void:
 				+ (Vector3.UP * UNIT_SELECT_OFFSET)
 		)
 		if unit is TestUnit:
+			if hover:
+				(unit as TestUnit).set_hovered(rect_abs.has_point(point))
+			else:
 				(unit as TestUnit).set_selected(rect_abs.has_point(point))
+				(unit as TestUnit).set_hovered(false)
 
 
 func _on_frustrum_area_unit_entered(unit: Node3D) -> void:

scripts/units/test_unit.gd

@@ -5,10 +5,12 @@ const MOVE_SPEED: float = 3
 const TURN_SPEED: float = 10
 
 var selected: bool = false
+var hovered: bool = false
 var ground_plane: Plane = Plane(Vector3.UP, 0)
 
 @onready var camera: Camera3D = get_viewport().get_camera_3d()
 @onready var selection_sprite: Sprite3D = $SelectionSprite
+@onready var hover_sprite: Sprite3D = $HoverSprite
 @onready var nav_agent: NavigationAgent3D = $NavigationAgent3D
 @onready var animation_player: AnimationPlayer = $AnimationPlayer
 
@@ -40,7 +42,10 @@ func _input(event: InputEvent) -> void:
 
 func set_selected(on: bool) -> void:
 	selected = on
-	selection_sprite.visible = selected
+
+
+func set_hovered(on: bool) -> void:
+	hovered = on
 
 
 func _set_target_click(mouse_pos: Vector2) -> void:
@@ -83,6 +88,9 @@ func _animate(delta: float) -> void:
 	else:
 		animation_player.play('idle')
 	
+	selection_sprite.visible = selected
+	hover_sprite.visible = hovered
+
 
 func _on_nav_agent_velocity_computed(safe_velocity: Vector3) -> void:
 	velocity = safe_velocity