Updated

Scripts/Animation/MotionCapHelper/extra_scripts/trace back(追踪对象或层).py

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+import maya.cmds as cmds
+objs = cmds.ls(selection = True,type = "dagNode",long = True)
+
+selectobjflag = True
+selectmultiobjflag = False
+if len(objs) == 0:
+    selectobjflag = False
+else:
+    if len(objs) != 1:
+        selectmultiobjflag = True
+    
+
+if objs == None:
+    selectobjflag = False
+
+curves = cmds.keyframe(query = True , selected = True , name  = True)
+print(type(curves))
+selectkeyflag = True
+if curves == None:
+    selectkeyflag = False
+
+if selectobjflag:
+    if selectkeyflag:
+        nodes = set()
+        for cv in curves:
+            node = cmds.listConnections(cv)[0]
+            nodes.add(node)
+        cmds.select(clear = True)
+        cmds.select(nodes)
+        print("TRACE BACK OBJS FROM KEY: " + str(nodes))
+    else:
+        obj = cmds.ls(objs[0])[0]
+        
+        layer = cmds.ls(cmds.listConnections(obj,t = "displayLayer"))
+        if len(layer) == 0:
+            print("this obj has no layer,or you have selected multiple objs.")
+        elif cmds.editDisplayLayerGlobals(cdl = True,q = True) == "defaultLayer":
+            print("no display layer selected,trace back won\'t work.")
+        else:
+            cmds.editDisplayLayerGlobals(cdl = layer[0])
+            
+            if selectmultiobjflag:
+                print("TRACE BACK LAYER FROM OBJ: " + layer[0] + "BUT WITH MULTIPLE OBJS SELECTED,SO RESULE IS UNEXPECTED.")
+            else:
+                print("TRACE BACK LAYER FROM OBJ: " + layer[0] )
+else :
+    print("no objs selected!")