Implemented outline for face selection. (Face selection itself is not yet implemented though.)

game/addons/mesh_data_resource_editor/MIDGizmo.gd

@@ -124,6 +124,8 @@ func redraw():
 	
 	if selection_mode == SelectionMode.SELECTION_MODE_EDGE:
 		_mesh_outline_generator.generate_mark_edges()
+	elif selection_mode == SelectionMode.SELECTION_MODE_FACE:
+		_mesh_outline_generator.generate_mark_faces()
 	else:
 		_mesh_outline_generator.generate()
 	

game/addons/mesh_data_resource_editor/utilities/mesh_outline.gd

@@ -75,3 +75,51 @@ func generate_mark_edges():
 				lines.append(pmid + Vector3(0, 0, -l))
 				lines.append(pmid + Vector3(0, l, 0))
 				lines.append(pmid + Vector3(0, -l, 0))
+
+func generate_mark_faces():
+	lines.resize(0)
+
+	if !_mdr:
+		return
+	
+	if _mdr.array.size() != ArrayMesh.ARRAY_MAX:
+		return
+	
+	if _mdr.array[ArrayMesh.ARRAY_VERTEX] == null || _mdr.array[ArrayMesh.ARRAY_INDEX] == null:
+		return
+	
+	var arr : Array = _mdr.array
+	
+	var vertices : PoolVector3Array = arr[ArrayMesh.ARRAY_VERTEX]
+	var indices : PoolIntArray = arr[ArrayMesh.ARRAY_INDEX]
+	
+	if vertices.size() == 0:
+		return
+
+	if indices.size() % 3 != 0:
+		return
+		
+	for i in range(0, indices.size(), 3):
+		for j in range(3):
+			lines.append(vertices[indices[i + j]])
+			lines.append(vertices[indices[i + ((j + 1) % 3)]])
+
+	for i in range(0, indices.size(), 3):
+			var i0 : int = indices[i + 0]
+			var i1 : int = indices[i + 1]
+			var i2 : int = indices[i + 2]
+				
+			var v0 : Vector3 = vertices[i0]
+			var v1 : Vector3 = vertices[i1]
+			var v2 : Vector3 = vertices[i2]
+
+			var pmid : Vector3 = v0 + v1 + v2
+			pmid /= 3
+			var l : float = (v0 - v1).length() / 20.0
+				
+			lines.append(pmid + Vector3(l, 0, 0))
+			lines.append(pmid + Vector3(-l, 0, 0))
+			lines.append(pmid + Vector3(0, 0, l))
+			lines.append(pmid + Vector3(0, 0, -l))
+			lines.append(pmid + Vector3(0, l, 0))
+			lines.append(pmid + Vector3(0, -l, 0))