msh release

__init__.py

@@ -127,7 +127,7 @@ def add_capped_frustum(bm: bmesh.types.BMesh,
 # Bone → per-end matrices
 # ---------------------------------------------------------------------------
 
-def _end_matrices(world_mat: Matrix, bone_matrix: Matrix, bone_length: float):
+def _end_matrices(bone_matrix: Matrix, bone_length: float):
     """
     Return (head_mat, tail_mat) — world-space matrices for each bone end.
 
@@ -160,15 +160,44 @@ def _end_matrices(world_mat: Matrix, bone_matrix: Matrix, bone_length: float):
     def _make(pos_local):
         local_mat = orient.to_4x4()
         local_mat.col[3][:3] = pos_local
-        return world_mat @ local_mat
+        return local_mat
 
     return _make(head_local), _make(tail_local)
 
+SUFFIX = "_envelope_mesh"
 
 # ---------------------------------------------------------------------------
-# Operator
+# Operators
 # ---------------------------------------------------------------------------
 
+class ARMATURE_OT_release_mesh(bpy.types.Operator):
+    bl_idname  = "armature.release_mesh"
+    bl_label   = "Release Mesh"
+    bl_description = (
+        "Clear the target mesh reference from the panel. "
+        "Does not delete any objects or data, but allows the next build to create a new mesh."
+    )
+    bl_options = {'REGISTER', 'UNDO'}
+
+    @classmethod
+    def poll(cls, context):
+        obj = context.active_object
+        if obj is not None and obj.type == 'ARMATURE':
+            lookup_name = obj.name + SUFFIX
+            for child in obj.children:
+                if child.type == 'MESH' and child.name == lookup_name:
+                    return True
+
+    def execute(self, context):
+        obj = context.active_object
+        for child in obj.children:
+            if child.type == 'MESH' and child.name == obj.name + SUFFIX:
+                m = child.matrix_world.copy()
+                child.parent = None
+                child.matrix_world = m
+                child.name = child.name.replace(SUFFIX, "_snapshot")
+
+        return {'FINISHED'}
 class ARMATURE_OT_build_envelope_mesh(bpy.types.Operator):
     bl_idname  = "armature.build_envelope_mesh"
     bl_label   = "Build Envelope Mesh"
@@ -192,12 +221,11 @@ class ARMATURE_OT_build_envelope_mesh(bpy.types.Operator):
 
     def execute(self, context):
         arm_obj   = context.active_object
-        world_mat = arm_obj.matrix_world
         bm        = bmesh.new()
         tables    = _Tables(self.segments)
 
         def meshify(bone_matrix, bone_length, head_radius, tail_radius, draw_head=True):
-            head_mat, tail_mat = _end_matrices(world_mat, bone_matrix, bone_length)
+            head_mat, tail_mat = _end_matrices(bone_matrix, bone_length)
             if draw_head:
                 add_sphere(bm, head_mat, max(head_radius, 0.001), tables)
             add_sphere(bm, tail_mat, max(tail_radius, 0.001), tables)
@@ -217,8 +245,14 @@ class ARMATURE_OT_build_envelope_mesh(bpy.types.Operator):
                         bone.bone.head_radius, bone.bone.tail_radius,
                         bone.parent is None)
 
-        panel_props = context.scene.envelope_mesher
-        target      = panel_props.target
+        lookup_name = arm_obj.name + SUFFIX
+        target = None
+        for child in arm_obj.children:
+            if child.type == 'MESH' and child.name == lookup_name:
+                target = child
+                break
+
+        print(target)
 
         if target is not None:
             # Destructively replace the target's mesh data.
@@ -231,30 +265,17 @@ class ARMATURE_OT_build_envelope_mesh(bpy.types.Operator):
             bpy.data.meshes.remove(old_mesh)
         else:
             # Create a new object and hand it back to the panel picker.
-            new_mesh = bpy.data.meshes.new(arm_obj.name + "_envelope_mesh")
+            new_mesh = bpy.data.meshes.new(lookup_name)
             bm.to_mesh(new_mesh)
             bm.free()
             new_mesh.update()
-            result_obj = bpy.data.objects.new(arm_obj.name + "_envelope", new_mesh)
+            result_obj = bpy.data.objects.new(lookup_name, new_mesh)
+            result_obj.parent = arm_obj
             context.collection.objects.link(result_obj)
-            panel_props.target = result_obj
 
         return {'FINISHED'}
 
 
-# ---------------------------------------------------------------------------
-# Panel properties
-# ---------------------------------------------------------------------------
-
-class EnvelopeMesherProperties(bpy.types.PropertyGroup):
-    target: bpy.props.PointerProperty(
-        name="Target",
-        description="Object whose mesh will be replaced on each run. "
-                    "Leave empty to create a new object on first run.",
-        type=bpy.types.Object,
-    )
-
-
 # ---------------------------------------------------------------------------
 # Panel
 # ---------------------------------------------------------------------------
@@ -268,9 +289,6 @@ class VIEW3D_PT_armature_mesher(bpy.types.Panel):
 
     def draw(self, context):
         layout = self.layout
-        props  = context.scene.envelope_mesher
-
-        layout.prop(props, "target")
 
         op = layout.operator(
             ARMATURE_OT_build_envelope_mesh.bl_idname,
@@ -279,13 +297,19 @@ class VIEW3D_PT_armature_mesher(bpy.types.Panel):
         )
         op.segments = 16
 
+        op = layout.operator(
+            ARMATURE_OT_release_mesh.bl_idname,
+            text="Release Mesh",
+            icon='OUTLINER_OB_MESH',
+        )
+
 
 # ---------------------------------------------------------------------------
 # Registration
 # ---------------------------------------------------------------------------
 
 classes = (
-    EnvelopeMesherProperties,
+    ARMATURE_OT_release_mesh,
     ARMATURE_OT_build_envelope_mesh,
     VIEW3D_PT_armature_mesher,
 )
@@ -293,12 +317,8 @@ classes = (
 def register():
     for cls in classes:
         bpy.utils.register_class(cls)
-    bpy.types.Scene.envelope_mesher = bpy.props.PointerProperty(
-        type=EnvelopeMesherProperties,
-    )
 
 def unregister():
-    del bpy.types.Scene.envelope_mesher
     for cls in reversed(classes):
         bpy.utils.unregister_class(cls)