Created
May 1, 2022 07:45
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Blender remove empty Vertex Groups and Shape Keys
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| ## Remove empty vertex groups and shape keys | |
| ## Credits: | |
| ## https://blender.stackexchange.com/questions/237599/is-there-a-way-to-automatically-delete-shape-keys-that-are-identical-to-the-basi | |
| ## https://blender.stackexchange.com/questions/16517/how-to-quickly-remove-all-zero-weight-vertex-groups | |
| import bpy | |
| import numpy as np | |
| # Tolerance to small differences, change it if you want | |
| tolerance = 0.001 | |
| assert bpy.context.mode == 'OBJECT', "Must be in object mode!" | |
| def survey(obj): | |
| maxWeight = {} | |
| for i in obj.vertex_groups: | |
| maxWeight[i.index] = 0 | |
| for v in obj.data.vertices: | |
| for g in v.groups: | |
| gn = g.group | |
| w = obj.vertex_groups[g.group].weight(v.index) | |
| if (maxWeight.get(gn) is None or w>maxWeight[gn]): | |
| maxWeight[gn] = w | |
| return maxWeight | |
| for obj in bpy.context.selected_objects: | |
| if obj.type != 'MESH': continue | |
| if not obj.data.shape_keys: continue | |
| if not obj.data.shape_keys.use_relative: continue | |
| kbs = obj.data.shape_keys.key_blocks | |
| nverts = len(obj.data.vertices) | |
| to_delete = [] | |
| # Cache locs for rel keys since many keys have the same rel key | |
| cache = {} | |
| locs = np.empty(3*nverts, dtype=np.float32) | |
| for kb in kbs: | |
| if kb == kb.relative_key or 'vrc.v_' in kb.name: | |
| continue | |
| kb.data.foreach_get("co", locs) | |
| if kb.relative_key.name not in cache: | |
| rel_locs = np.empty(3*nverts, dtype=np.float32) | |
| kb.relative_key.data.foreach_get("co", rel_locs) | |
| cache[kb.relative_key.name] = rel_locs | |
| rel_locs = cache[kb.relative_key.name] | |
| locs -= rel_locs | |
| if (np.abs(locs) < tolerance).all(): | |
| to_delete.append(kb.name) | |
| for kb_name in to_delete: | |
| obj.shape_key_remove(obj.data.shape_keys.key_blocks[kb_name]) | |
| maxWeight = survey(obj) | |
| # fix bug pointed out by user2859 | |
| ka = [] | |
| ka.extend(maxWeight.keys()) | |
| ka.sort(key=lambda gn: -gn) | |
| print (ka) | |
| for gn in ka: | |
| if maxWeight[gn]<=0: | |
| print ("delete %d"%gn) | |
| obj.vertex_groups.remove(obj.vertex_groups[gn]) # actually remove the group |
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