Add apply shapekey to basis

add apply shapekey to basis to shapekey menu

I believe I wrote this simple implementation for Tuxedo, I don't remember how I came up with it.

__init__.py

@@ -33,6 +33,11 @@ def register():
     #finally register properties that may use some classes.
     core.register.register_properties()
 
+    from functions.mesh_tools import AvatarToolkit_OT_ApplyShapeKey
+    
+    bpy.types.MESH_MT_shape_key_context_menu.append((lambda self, context: self.layout.separator()))
+    bpy.types.MESH_MT_shape_key_context_menu.append((lambda self, context: self.layout.operator(AvatarToolkit_OT_ApplyShapeKey.bl_idname, icon="KEY_HLT")))
+
 def unregister():
     print("Unregistering Avatar Toolkit")
     # Unregister the UI classes

core/common.py

@@ -144,6 +144,36 @@ def select_current_armature(context: Context) -> bool:
         return True
     return False
 
+def apply_shapekey_to_basis(context: bpy.types.Context, obj: bpy.types.Object, shape_key_name: str, delete_old: bool = False) -> bool:
+    if shape_key_name not in obj.data.shape_keys.key_blocks:
+       return False
+    shapekeynum = obj.data.shape_keys.key_blocks.find(shape_key_name)
+
+    bpy.ops.object.mode_set(mode="EDIT")
+
+    bpy.ops.mesh.select_all(action='SELECT')
+
+
+    obj.active_shape_key_index = 0
+    bpy.ops.mesh.blend_from_shape(shape = shape_key_name, add=True, blend=1)
+    obj.active_shape_key_index = shapekeynum
+    bpy.ops.mesh.select_all(action='SELECT')
+    bpy.ops.mesh.blend_from_shape(shape = shape_key_name, add=True, blend=-2)
+
+
+    bpy.ops.mesh.select_all(action='DESELECT')
+
+    bpy.ops.object.mode_set(mode="OBJECT")
+    print("blended!")
+
+    if delete_old:
+        obj.active_shape_key_index = shapekeynum
+        bpy.ops.object.shape_key_remove(all=False)
+    else:
+        mesh: bpy.types.Mesh = obj.data
+        mesh.shape_keys.key_blocks[shape_key_name].name = shape_key_name + "_reversed"
+    return True
+
 def apply_pose_as_rest(context: Context, armature_obj: bpy.types.Object, meshes: list[bpy.types.Object]) -> bool:
     for obj in meshes:
         mesh_data: Mesh = obj.data

functions/mesh_tools.py

@@ -1,7 +1,7 @@
 import numpy as np
 import bpy
 from bpy.types import Context
-from ..core.common import get_selected_armature, get_all_meshes, is_valid_armature
+from ..core.common import get_selected_armature, get_all_meshes, is_valid_armature, apply_shapekey_to_basis, has_shapekeys
 from ..functions.translations import t
 from ..core.register import register_wrap
 
@@ -54,3 +54,28 @@ class AvatarToolkit_OT_RemoveUnusedShapekeys(bpy.types.Operator):
                 if ("-" in kb_name) or ("=" in kb_name) or ("~" in kb_name): #don't delete category names. - @989onan
                     continue
                 ob.shape_key_remove(ob.data.shape_keys.key_blocks[kb_name])
+
+
+
+@register_wrap
+class AvatarToolkit_OT_ApplyShapeKey(bpy.types.Operator):
+    bl_idname = "avatar_toolkit.apply_shape_key"
+    bl_label = t("Tools.apply_shape_key.label")
+    bl_description = t("Tools.apply_shape_key.desc")
+    bl_options = {'REGISTER', 'UNDO'}
+    
+
+    @classmethod
+    def poll(cls, context: Context) -> bool:
+        armature = get_selected_armature(context)
+        return armature is not None and is_valid_armature(armature) and (len(get_all_meshes(context)) > 0) and (context.mode == "OBJECT") and context.view_layer.objects.active is not None and has_shapekeys(context.view_layer.objects.active)
+
+    def execute(self, context: Context) -> set[str]:
+        obj: bpy.types.Object = context.view_layer.objects.active
+
+        
+        if (apply_shapekey_to_basis(context,obj,obj.active_shape_key.name,False)):
+            return {'FINISHED'}
+        else:
+            self.report({'ERROR'}, t("Tools.apply_shape_key.error"))
+            return {'FINISHED'}

resources/translations/en_US.json

@@ -151,6 +151,9 @@
     "Tools.remove_unused_shapekeys.tolerance.desc": "Min movement for position on any coordinate\n for any vertex for a shapekey to be kept.",
     "Tools.remove_unused_shapekeys.desc": "Remove shapekeys that don't move anything.\nDoesn't get rid of category shapekeys.\n(ex: has \"~\", \"-\", or \"=\" in the name.)",
     "Tools.remove_unused_shapekeys.tolerance.label": "Position Tolerance",
+    "Tools.apply_shape_key.label": "Apply Shapekey to Basis",
+    "Tools.apply_shape_key.desc": "Apply the selected shapekey to the basis, making it default on.",
+    "Tools.apply_shape_key.error": "The shape keys were not merged for some reason!",
     "Tools.remove_zero_weight_bones.success": "Zero weight bones removed successfully",
     "Tools.remove_zero_weight_bones.label": "Remove Zero Weight Bones",
     "Tools.remove_zero_weight_bones.desc": "Remove bones from the armature that have weights less than threshold.",