vertex_group_operators.py

@@ -1,7 +1,8 @@
 from typing import List, Tuple
 
-import bpy
+import bpy, sys
 from bpy.types import Operator, Mesh, VertexGroup, MeshVertex, Object
+import itertools
 import bmesh
 from .utils.naming import flip_name
 
@@ -268,10 +269,7 @@ def build_vert_index_map(mesh) -> dict:
 
 def find_weight_island_vertices(mesh: Mesh, vert_idx: int, group_index: int, vert_idx_map: dict, island=[]) -> List[int]:
 	"""Recursively find all vertices that are connected to a vertex by edges, and are also in the same vertex group."""
-	# I am sick of bmesh, so you must build a vertex connection map with build_vert_index_map and pass it in here.
 
-
-	mesh.vertices[vert_idx].select = True
 	island.append(vert_idx)
 	for connected_vert_idx in vert_idx_map[vert_idx]:		# For each edge connected to the vert
 		if connected_vert_idx in island:					# Avoid infinite recursion!
@@ -281,11 +279,11 @@ def find_weight_island_vertices(mesh: Mesh, vert_idx: int, group_index: int, ver
 				find_weight_island_vertices(mesh, connected_vert_idx, group_index, vert_idx_map, island)	# Continue recursion
 	return island
 
-def find_any_vertex_in_group(mesh: Mesh, vgroup: VertexGroup, is_selected=None) -> MeshVertex:
+def find_any_vertex_in_group(mesh: Mesh, vgroup: VertexGroup, excluded_indicies=[]) -> MeshVertex:
 	"""Return the index of the first vertex we find which is part of the 
 	vertex group and optinally, has a specified selection state."""
 	for v in mesh.vertices:
-		if is_selected != None and v.select != is_selected:
+		if v.index in excluded_indicies:
 			continue
 		for g in v.groups:
 			if vgroup.index == g.group:
@@ -296,10 +294,13 @@ def build_weight_islands_in_group(mesh: Mesh, vgroup: VertexGroup, vert_index_ma
 	"""Return a list of lists of vertex indicies: Weight islands within this vertex group."""
 	islands = []
 	while True:
-		any_unselected_vertex_in_group = find_any_vertex_in_group(mesh, vgroup, is_selected=False)
+		flat_islands = set(itertools.chain.from_iterable(islands))
+		any_unselected_vertex_in_group = find_any_vertex_in_group(mesh, vgroup, excluded_indicies=flat_islands)
 		if not any_unselected_vertex_in_group:
 			break
-		island = find_weight_island_vertices(mesh, any_unselected_vertex_in_group.index, vgroup.index, vert_index_map, [])
+		sys.setrecursionlimit(len(mesh.vertices))	# TODO: I guess recursion is bad and we should avoid it here?
+		island = find_weight_island_vertices(mesh, any_unselected_vertex_in_group.index, vgroup.index, vert_index_map, island=[])
+		sys.setrecursionlimit(990)
 		islands.append(island)
 	return islands
 
@@ -309,7 +310,7 @@ def select_vertices(mesh: Mesh, vert_indicies: List[int]):
 		mesh.vertices[vi].select = True
 
 class FocusRogueDeformingWeights(WeightPaintOperator):
-	"""While in weight paint mode, find and focus a deforming vertex group which consists of several islands. Automatic fixing is dangerous, so this operator does not remove weights automatically. Keep using this until no more rogue weights are found"""
+	"""While in weight paint mode, find and focus a deforming vertex group which consists of several islands. The smallest weight island is selected, but no weights are removed. Keep running this until no more rogue weights are found"""
 	bl_idname = "object.focus_rogue_weights"
 	bl_label = "Focus Rogue Weights"
 	bl_options = {'REGISTER', 'UNDO'}
@@ -326,10 +327,10 @@ class FocusRogueDeformingWeights(WeightPaintOperator):
 		obj['skip_groups'] = l
 
 	@staticmethod
-	def find_vgroup_with_multiple_islands(obj: Object, vert_index_map: dict) -> Tuple[VertexGroup, List[List[int]]]:
+	def find_rogue_deform_weights(obj: Object, vert_index_map: dict) -> Tuple[VertexGroup, List[List[int]]]:
 		"""Return the first vertex group we find that has multiple islands, as well as the islands."""
 		mesh = obj.data
-		for vgroup in obj.vertex_groups:
+		for vgroup in get_deforming_vgroups(obj):
 			if 'skip_groups' in obj and vgroup.name in obj['skip_groups']:
 				continue
 			obj.vertex_groups.active_index = vgroup.index
@@ -339,6 +340,8 @@ class FocusRogueDeformingWeights(WeightPaintOperator):
 			if len(islands) > 1:
 				return vgroup, islands
 		
+		return None, None
+
 	def execute(self, context):
 		rig = context.pose_object
 		obj = context.object
@@ -347,35 +350,35 @@ class FocusRogueDeformingWeights(WeightPaintOperator):
 
 		bpy.ops.object.mode_set(mode='EDIT')
 		bpy.ops.mesh.select_mode(type='VERT')
+		bpy.ops.mesh.reveal()
 		bpy.ops.mesh.select_all(action='DESELECT')
 
 		mesh = obj.data
 		vert_index_map = build_vert_index_map(mesh)
 		bpy.ops.object.mode_set(mode='OBJECT')
 
-		vgroup, islands = self.find_vgroup_with_multiple_islands(obj, vert_index_map)
+		vgroup, islands = self.find_rogue_deform_weights(obj, vert_index_map)
 
 		if vgroup:
-			# Select islands except the one with the most verts.
+			# Select the smallest island.
-			largest_island = max(islands, key=len)
+			select_vertices(mesh, min(islands, key=len))
-			for island in islands:
-				if island == largest_island: continue
-				select_vertices(mesh, island)
 
 			# Support the case where the user chooses not to fix the rogue weights: Perhaps they are intentional
 			self.save_skip_group(obj, vgroup)
 
 			self.report({'INFO'}, f'Found Vertex Group "{vgroup.name}" with {len(islands)} islands. Fix or ignore it, then keep running this operator to find the next group with rogue weights.')
 
-			mesh.use_paint_mask_vertex = True
 			if rig:
 				rig.select_set(True)
+			mesh.use_paint_mask_vertex = True
 			bpy.ops.object.mode_set(mode='WEIGHT_PAINT')
 		else:
+			if rig:
+				rig.select_set(True)
 			obj.vertex_groups.active_index = org_vg_idx
 			bpy.ops.object.mode_set(mode=org_mode)
 			if 'skip_groups' in obj and len(obj['skip_groups']) > 0:
-				self.report({'INFO'}, f"No rogue weights found, but {len(obj['skip_groups'])} were skipped. Run the operator again to cycle through groups with rogue weights.")
+				self.report({'INFO'}, f"No rogue weights found, but {len(obj['skip_groups'])} were skipped. Keep running the operator to cycle through groups with multiple weight islands to make sure they are desired.")
 				del obj['skip_groups']
 			else:
 				self.report({'INFO'}, "No rogue weights found!")