bl_info = { "name": "Bake Vertex to Target Vector", "blender": (3, 0, 0), "category": "Mesh", "version": (2, 3, 0), "author": "yum_food", "description": "Bake vertex vectors with automatic center and scale calculation in Edit Mode, with submesh deduplication" } import bpy import mathutils import bmesh from bpy.props import BoolProperty, FloatProperty from bpy.types import Panel, Operator class MESH_OT_bake_vertex_vectors(Operator): bl_idname = "mesh.bake_vertex_vectors" bl_label = "Bake Vertex Vectors" bl_description = "Bake selected vertices with automatic center and scale calculation" bl_options = {'REGISTER', 'UNDO'} contiguous_mode: BoolProperty( name="Contiguous Groups", description="Process each contiguous group of vertices separately with its own center and scale", default=False ) @classmethod def poll(cls, context): obj = context.active_object return (obj is not None and obj.type == 'MESH' and context.mode == 'EDIT_MESH') def get_vertex_islands(self, mesh, selected_indices): """Find contiguous groups of vertices using edge connectivity""" adjacency = {idx: set() for idx in selected_indices} for edge in mesh.edges: v0, v1 = edge.vertices if v0 in selected_indices and v1 in selected_indices: adjacency[v0].add(v1) adjacency[v1].add(v0) islands = [] visited = set() for start_idx in selected_indices: if start_idx in visited: continue island = set() queue = [start_idx] while queue: current = queue.pop(0) if current in visited: continue visited.add(current) island.add(current) for neighbor in adjacency[current]: if neighbor not in visited: queue.append(neighbor) islands.append(island) return islands def get_island_info(self, mesh, island_indices): """Calculate center and scale for a single island""" verts = [] for idx in island_indices: verts.append(mesh.vertices[idx].co) if not verts: return None, None, None center = mathutils.Vector((0, 0, 0)) for co in verts: center += co center /= len(verts) max_dist = 0.0 for co in verts: vec = co - center max_component = max(abs(vec.x), abs(vec.y), abs(vec.z)) max_dist = max(max_dist, max_component) if max_dist > 0: scale = 1.0 / max_dist else: scale = 1.0 return center, max_dist, scale def execute(self, context): obj = context.active_object mesh = obj.data try: bpy.ops.object.mode_set(mode='OBJECT') except Exception as e: self.report({'ERROR'}, f"Failed to switch to object mode: {str(e)}") return {'CANCELLED'} selected_indices = {v.index for v in mesh.vertices if v.select} if not selected_indices: self.report({'WARNING'}, "No vertices selected") try: bpy.ops.object.mode_set(mode='EDIT') except: pass return {'CANCELLED'} # Check if mesh has faces if not mesh.polygons: self.report({'ERROR'}, "Mesh has no faces. Vertex colors require faces to store data.") try: bpy.ops.object.mode_set(mode='EDIT') except: pass return {'CANCELLED'} if not mesh.vertex_colors: mesh.vertex_colors.new(name="BakedVectors") color_layer = mesh.vertex_colors.active if not color_layer: self.report({'ERROR'}, "Failed to create vertex color layer") try: bpy.ops.object.mode_set(mode='EDIT') except: pass return {'CANCELLED'} source_matrix = obj.matrix_world if self.contiguous_mode: islands = self.get_vertex_islands(mesh, selected_indices) total_updated = 0 for island_indices in islands: center, max_dist, scale = self.get_island_info(mesh, island_indices) if center is None: continue center_world = source_matrix @ center for poly in mesh.polygons: for loop_idx in poly.loop_indices: vertex_idx = mesh.loops[loop_idx].vertex_index if vertex_idx in island_indices: vertex = mesh.vertices[vertex_idx] vertex_world = source_matrix @ vertex.co vector_world = center_world - vertex_world vector_object = source_matrix.inverted_safe().to_3x3() @ vector_world vector_scaled = vector_object * scale color = mathutils.Vector(( (vector_scaled.x + 1.0) * 0.5, (vector_scaled.y + 1.0) * 0.5, (vector_scaled.z + 1.0) * 0.5, scale )) color_layer.data[loop_idx].color = color total_updated += 1 mesh.update() try: bpy.ops.object.mode_set(mode='EDIT') except Exception as e: self.report({'WARNING'}, f"Could not return to edit mode: {str(e)}") self.report({'INFO'}, f"Baked {len(islands)} contiguous groups ({len(selected_indices)} vertices)") return {'FINISHED'} else: verts = [] for idx in selected_indices: verts.append(mesh.vertices[idx].co) center = mathutils.Vector((0, 0, 0)) for co in verts: center += co center /= len(verts) max_dist = 0.0 for co in verts: vec = co - center max_component = max(abs(vec.x), abs(vec.y), abs(vec.z)) max_dist = max(max_dist, max_component) if max_dist > 0: scale = 1.0 / max_dist else: scale = 1.0 center_world = source_matrix @ center updated_count = 0 for poly in mesh.polygons: for loop_idx in poly.loop_indices: vertex_idx = mesh.loops[loop_idx].vertex_index if vertex_idx in selected_indices: vertex = mesh.vertices[vertex_idx] vertex_world = source_matrix @ vertex.co vector_world = center_world - vertex_world vector_object = source_matrix.inverted_safe().to_3x3() @ vector_world vector_scaled = vector_object * scale color = mathutils.Vector(( (vector_scaled.x + 1.0) * 0.5, (vector_scaled.y + 1.0) * 0.5, (vector_scaled.z + 1.0) * 0.5, scale )) color_layer.data[loop_idx].color = color updated_count += 1 mesh.update() try: bpy.ops.object.mode_set(mode='EDIT') except Exception as e: self.report({'WARNING'}, f"Could not return to edit mode: {str(e)}") self.report({'INFO'}, f"Baked {len(selected_indices)} vertices with scale {scale:.3f}") return {'FINISHED'} def draw(self, context): layout = self.layout layout.prop(self, "contiguous_mode") def invoke(self, context, event): return context.window_manager.invoke_props_dialog(self) class MESH_OT_select_all_linked_submeshes(Operator): bl_idname = "mesh.select_all_linked_submeshes" bl_label = "Select All Linked Submeshes" bl_description = "Select all vertices in any submesh that has at least one vertex selected" bl_options = {'REGISTER', 'UNDO'} @classmethod def poll(cls, context): obj = context.active_object return (obj is not None and obj.type == 'MESH' and context.mode == 'EDIT_MESH') def execute(self, context): obj = context.active_object mesh = obj.data # Switch to object mode for reliable selection updates bpy.ops.object.mode_set(mode='OBJECT') # Get currently selected vertices initially_selected = set() for v in mesh.vertices: if v.select: initially_selected.add(v.index) if not initially_selected: self.report({'WARNING'}, "No vertices selected") bpy.ops.object.mode_set(mode='EDIT') return {'CANCELLED'} # Build adjacency from edges adjacency = {i: set() for i in range(len(mesh.vertices))} for edge in mesh.edges: v0, v1 = edge.vertices adjacency[v0].add(v1) adjacency[v1].add(v0) # Find all islands all_indices = set(range(len(mesh.vertices))) islands = [] visited = set() for start_idx in all_indices: if start_idx in visited: continue island = set() queue = [start_idx] while queue: current = queue.pop(0) if current in visited: continue visited.add(current) island.add(current) for neighbor in adjacency[current]: if neighbor not in visited: queue.append(neighbor) islands.append(island) # Select vertices in islands that have any selected vertex expanded_count = 0 affected_islands = 0 for island in islands: if island & initially_selected: # If island has any selected vertices new_selections = island - initially_selected expanded_count += len(new_selections) if new_selections: affected_islands += 1 # Select all vertices in this island for idx in island: mesh.vertices[idx].select = True # Select edges where both vertices are selected for edge in mesh.edges: v0, v1 = edge.vertices if mesh.vertices[v0].select and mesh.vertices[v1].select: edge.select = True # Select faces where all vertices are selected for face in mesh.polygons: all_verts_selected = all(mesh.vertices[v].select for v in face.vertices) if all_verts_selected: face.select = True # Return to edit mode bpy.ops.object.mode_set(mode='EDIT') self.report({'INFO'}, f"Expanded selection in {affected_islands} submeshes ({expanded_count} new vertices)") return {'FINISHED'} class MESH_PT_bake_vertex_panel(Panel): bl_label = "Bake Vertex Vectors" bl_idname = "MESH_PT_bake_vertex_vectors" bl_space_type = 'VIEW_3D' bl_region_type = 'UI' bl_category = "Tool" def draw(self, context): layout = self.layout obj = context.active_object col = layout.column() if obj and obj.type == 'MESH': if context.mode == 'EDIT_MESH': col.operator("mesh.select_all_linked_submeshes", icon='SELECT_EXTEND') col.separator() col.operator("mesh.bake_vertex_vectors", icon='EXPORT') box = col.box() box.label(text="Info:", icon='INFO') box.label(text="Select All Linked: Expand selection to full submeshes") box.label(text="Bake: Auto-scale selected vertices") box.label(text="Toggle Contiguous Groups for separate islands") box.label(text="Scale factor stored in alpha channel") mesh = obj.data if mesh.vertex_colors and len(mesh.vertex_colors) > 0: col.separator() col.label(text=f"Active: {mesh.vertex_colors.active.name}", icon='GROUP_VCOL') else: col.label(text="Enter Edit Mode to bake vertices", icon='INFO') else: col.label(text="Select a mesh object", icon='ERROR') classes = [ MESH_OT_bake_vertex_vectors, MESH_OT_select_all_linked_submeshes, MESH_PT_bake_vertex_panel ] def menu_func(self, context): self.layout.separator() self.layout.operator("mesh.select_all_linked_submeshes", icon='SELECT_EXTEND') self.layout.operator("mesh.bake_vertex_vectors", icon='EXPORT') def register(): for cls in classes: bpy.utils.register_class(cls) bpy.types.VIEW3D_MT_edit_mesh.append(menu_func) def unregister(): bpy.types.VIEW3D_MT_edit_mesh.remove(menu_func) for cls in reversed(classes): bpy.utils.unregister_class(cls) if __name__ == "__main__": register()