handle inverted orientations

Author: williamchange

material_maker/panels/preview_3d/model_menu.gd

@@ -125,26 +125,25 @@ func _process(delta: float) -> void:
 
 
 func _on_snap_pressed(id: int) -> void:
-	var tween = get_tree().create_tween()
-	var pivot = preview3D.get_node("MaterialPreview/Preview3d/ObjectsPivot/Objects")
-	var cam_control = preview3D.get_node("MaterialPreview/Preview3d/CameraController")
+	var shift_down : bool = Input.is_key_pressed(KEY_SHIFT)
+	var tween := get_tree().create_tween()
+	var pivot := preview3D.get_node("MaterialPreview/Preview3d/ObjectsPivot/Objects")
+	var cam_control := preview3D.get_node("MaterialPreview/Preview3d/CameraController")
 	var camrot2 : Node3D = preview3D.camera_controller.camera_rotation2
 	var camrot1 : Node3D = preview3D.camera_controller.camera_rotation1
-	var rot2 : Vector3
-	var rot1 : Vector3
+	var rot2 := camrot2.rotation
+	var rot1 := Vector3(camrot1.rotation.x, 0.0, camrot2.rotation.z)
 	match id:
 		SnapView.Top:
-			rot2 = Vector3(-PI * 0.5, camrot2.rotation.y, camrot2.rotation.z)
-			rot1 = Vector3(camrot1.rotation.x, 0.0, camrot2.rotation.z)
+			rot2.x = -PI * (-0.5 if shift_down else 0.5)
+			rot1.y = 0.0
 		SnapView.Front:
-			rot2 = Vector3(0.0, camrot2.rotation.y, camrot2.rotation.z)
-			rot1 = Vector3(camrot1.rotation.x, 0.0, camrot2.rotation.z)
+			rot2.x = 0.0
+			rot1.y = PI * (1.0 if shift_down else 0.0)
 		SnapView.Right:
-			rot2 = Vector3(0.0, camrot2.rotation.y, camrot2.rotation.z)
-			rot1 = Vector3(camrot1.rotation.x, -PI * 0.5, camrot2.rotation.z)
-
+			rot2.x = 0.0
+			rot1.y = -PI * (-0.5 if shift_down else 0.5)
 	tween.tween_property(camrot2, "rotation", rot2, 0.2).set_trans(Tween.TRANS_CUBIC)
 	tween.parallel().tween_property(camrot1, "rotation", rot1, 0.2).set_trans(Tween.TRANS_CUBIC)
 	tween.parallel().tween_property(pivot, "transform:origin", Vector3.ZERO, 0.2).set_trans(Tween.TRANS_CUBIC)
 	tween.parallel().tween_property(cam_control, "transform:origin", Vector3.ZERO, 0.2).set_trans(Tween.TRANS_CUBIC)
-