Add Physics Tests project

3d/physics_tests/utils/camera_orbit.gd

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+extends Camera
+
+
+const ROTATION_COEFF = 0.02
+
+var _rotation_enabled = false
+var _rotation_pivot
+
+
+func _ready():
+	call_deferred("_initialize_pivot")
+
+
+func _unhandled_input(event):
+	var mouse_button_event = event as InputEventMouseButton
+	if mouse_button_event:
+		if mouse_button_event.button_index == BUTTON_LEFT:
+			_rotation_enabled = mouse_button_event.pressed
+		return
+	
+	if not _rotation_enabled:
+		return
+	
+	var mouse_motion_event = event as InputEventMouseMotion
+	if mouse_motion_event:
+		var rotation_delta = mouse_motion_event.relative.x
+		_rotation_pivot.rotate(Vector3.UP, -rotation_delta * ROTATION_COEFF)
+
+
+func _initialize_pivot():
+	_rotation_pivot = Spatial.new()
+	var camera_parent = get_parent()
+	camera_parent.add_child(_rotation_pivot)
+	camera_parent.remove_child(self)
+	_rotation_pivot.add_child(self)