Fix T96748: split IK toe control does not respect stretch limit.

Split the parent mch bone and its rigging together with the control.

1 files changed, 20 insertions, 2 deletions

diff --git a/rigify/rigs/limbs/leg.py b/rigify/rigs/limbs/leg.py
index 05c606ef..77433101 100644
--- a/rigify/rigs/limbs/leg.py
+++ b/rigify/rigs/limbs/leg.py
@@ -98,9 +98,13 @@ class Rig(BaseLimbRig):
     #     Toe spin control.
     #   heel:
     #     Foot roll control
+    #   ik_toe:
+    #     If enabled, toe control for IK chain.
     # mch:
     #   heel[]:
     #     Chain of bones implementing foot roll.
+    #   ik_toe_parent:
+    #      If using split IK toe, parent of the IK toe control.
     #
     ####################################################
 
@@ -208,21 +212,35 @@ class Rig(BaseLimbRig):
     @stage.generate_bones
     def make_ik_toe_control(self):
         if self.use_ik_toe:
-            self.bones.ctrl.ik_toe = self.make_ik_toe_control_bone(self.bones.org.main[3])
+            toe = self.bones.org.main[3]
+            self.bones.ctrl.ik_toe = self.make_ik_toe_control_bone(toe)
+            self.bones.mch.ik_toe_parent = self.make_ik_toe_parent_mch_bone(toe)
 
     def make_ik_toe_control_bone(self, org):
         return self.copy_bone(org, make_derived_name(org, 'ctrl', '_ik'))
 
+    def make_ik_toe_parent_mch_bone(self, org):
+        return self.copy_bone(org, make_derived_name(org, 'mch', '_ik_parent'), scale=1/3)
+
     @stage.parent_bones
     def parent_ik_toe_control(self):
         if self.use_ik_toe:
-            self.set_bone_parent(self.bones.ctrl.ik_toe, self.get_mch_heel_toe_output())
+            mch = self.bones.mch
+            align_bone_orientation(self.obj, mch.ik_toe_parent, self.get_mch_heel_toe_output())
+
+            self.set_bone_parent(mch.ik_toe_parent, mch.ik_target, use_connect=True)
+            self.set_bone_parent(self.bones.ctrl.ik_toe, mch.ik_toe_parent)
 
     @stage.configure_bones
     def configure_ik_toe_control(self):
         if self.use_ik_toe:
             self.copy_bone_properties(self.bones.org.main[3], self.bones.ctrl.ik_toe, props=False)
 
+    @stage.rig_bones
+    def rig_ik_toe_control(self):
+        if self.use_ik_toe:
+            self.make_constraint(self.bones.mch.ik_toe_parent, 'COPY_TRANSFORMS', self.get_mch_heel_toe_output())
+
     @stage.generate_widgets
     def make_ik_toe_control_widget(self):
         if self.use_ik_toe: