zewt · August 19, 2020 06:14 · Aug 19, 2020
diff --git a/gistfile1.txt b/gistfile1.txt
@@ -0,0 +1,59 @@
+# Public domain
+
+from pymel import core as pm
+import re
+
+def resetJointOnCluster(joint, skinClusterPreMatrixPlug):
+    inverseMatrix = joint.attr('worldInverseMatrix').get()
+    curMatrix = skinClusterPreMatrixPlug.get()
+    if curMatrix is not None:
+        different = any(abs(a-b) > 0.00001 for a, b in zip(inverseMatrix, curMatrix))
+        if not different:
+            return False
+
+    skinClusterPreMatrixPlug.set(inverseMatrix, type='matrix')
+    return True
+
+def resetSkinnedJoints():
+    """Reset skin deformation for selected skinClusters."""
+    selection = pm.ls(sl=True) or []
+    if not selection:
+        print 'Select one or more skinClusters or joints.'
+        return
+
+    skinClustersToReset = []
+    jointsReset = []
+    for node in selection:
+        if isinstance(node, pm.nodetypes.Joint):
+            # If a joint is selected, reset the joint on all skinClusters that it's attached to.
+            skinClustersOnJoint = pm.listConnections(node.attr('worldMatrix'), type='skinCluster', p=True) or []
+            for skinClusterMatrixConnection in skinClustersOnJoint:
+                skinCluster = skinClusterMatrixConnection.node()
+                idx = skinClusterMatrixConnection.index()
+
+                if resetJointOnCluster(node, skinCluster.attr('bindPreMatrix').elementByLogicalIndex(idx)):
+                    jointsReset.append(node)
+                    skinClustersToReset.append(skinCluster)
+            continue
+
+        if isinstance(node, pm.nodetypes.SkinCluster):
+            # Reset all joints attached to this skinCluster.
+            print 'Resetting joints on skinCluster %s' % node
+            for idx in node.attr('matrix').get(mi=True):
+                joints = pm.listConnections(node.attr('matrix').elementByLogicalIndex(idx), type='joint')
+                if not joints:
+                    print 'No joints attached to %s' % node
+                    continue
+
+                joint = joints[0]
+                if resetJointOnCluster(joint, node.attr('bindPreMatrix').elementByLogicalIndex(idx)):
+                    jointsReset.append(joint)
+                skinClustersToReset.append(node)
+        else:
+            print 'Selected node %s isn\'t a skinCluster or a joint' % (node)
+            continue
+
+    print 'Reset %i joints: %s' % (len(jointsReset), ', '.join(node.nodeName() for node in jointsReset))
+
+resetSkinnedJoints()
+