Rigify: constraints are now copied over from metarig.

This allows advanced users to do certain limited custom rigging work
in the metarig, and have it transfer to the generated rig.
Custom properties are also copied when using the copy_bone function
in utils.
TODO: transfer drivers from the metarig as well.

rigify/generate.py

@@ -130,6 +130,15 @@ def generate_rig(context, metarig):
     obj.select = True
     scene.objects.active = obj
 
+    # Copy over bone properties
+    for bone in metarig.data.bones:
+        bone_gen = obj.data.bones[bone.name]
+
+        # B-bone stuff
+        bone_gen.bbone_segments = bone.bbone_segments
+        bone_gen.bbone_in = bone.bbone_in
+        bone_gen.bbone_out = bone.bbone_out
+
     # Copy over the pose_bone properties
     for bone in metarig.pose.bones:
         bone_gen = obj.pose.bones[bone.name]
@@ -146,14 +155,28 @@ def generate_rig(context, metarig):
         for prop in bone.keys():
             bone_gen[prop] = bone[prop]
 
-    # Copy over bone properties
-    for bone in metarig.data.bones:
-        bone_gen = obj.data.bones[bone.name]
-
-        # B-bone stuff
-        bone_gen.bbone_segments = bone.bbone_segments
-        bone_gen.bbone_in = bone.bbone_in
-        bone_gen.bbone_out = bone.bbone_out
+        # Constraints
+        for con1 in bone.constraints:
+            con2 = bone_gen.constraints.new(type=con1.type)
+
+            # Copy attributes
+            keys = dir(con1)
+            for key in keys:
+                if not key.startswith("_") \
+                and not key.startswith("error_") \
+                and key != "is_valid" \
+                and key != "rna_type" \
+                and key != "type" \
+                and key != "bl_rna":
+                    try:
+                        setattr(con2, key, getattr(con1, key))
+                    except AttributeError:
+                        print("Could not write to constraint attribute '%s'" % key)
+
+            # Set metarig target to rig target
+            if "target" in keys:
+                if getattr(con2, "target") == metarig:
+                    setattr(con2, "target", obj)
 
     t.tick("Duplicate rig: ")
     #----------------------------------

rigify/utils.py

@@ -185,6 +185,17 @@ def copy_bone(obj, bone_name, assign_name=''):
         pose_bone_2.lock_rotation_w = pose_bone_1.lock_rotation_w
         pose_bone_2.lock_rotations_4d = pose_bone_1.lock_rotations_4d
 
+        # Copy custom properties
+        for key in pose_bone_1.keys():
+            if key != "_RNA_UI" \
+            and key != "rigify_parameters" \
+            and key != "rigify_type":
+                prop1 = rna_idprop_ui_prop_get(pose_bone_1, key, create=False)
+                prop2 = rna_idprop_ui_prop_get(pose_bone_2, key, create=True)
+                pose_bone_2[key] = pose_bone_1[key]
+                for key in prop1.keys():
+                    prop2[key] = prop1[key]
+
         bpy.ops.object.mode_set(mode='EDIT')
 
         return bone_name_2