Allow triggering MSBs from Responders.

korman/nodes/node_messages.py

@@ -831,6 +831,34 @@ class PlasmaTimerCallbackMsgNode(PlasmaMessageWithCallbacksNode, bpy.types.Node)
         return msg
 
 
+class PlasmaTriggerMultiStageMsgNode(PlasmaMessageNode, bpy.types.Node):
+    bl_category = "MSG"
+    bl_idname = "PlasmaTriggerMultiStageMsgNode"
+    bl_label = "Trigger MultiStage"
+
+    output_sockets = OrderedDict([
+        ("satisfies", {
+            "text": "Trigger",
+            "type": "PlasmaConditionSocket",
+            "valid_link_nodes": "PlasmaMultiStageBehaviorNode",
+            "valid_link_sockets": "PlasmaConditionSocket",
+            "link_limit": 1,
+        })
+    ])
+
+    def convert_message(self, exporter, so):
+        # Yeah, this is not a REAL Plasma message, but the Korman way is to try to hide these little
+        # low-level notifications behind higher level abstractions, so here you go. A notify message
+        # that only targets plMultiStageBehMod. You're welcome!
+        msg = self.generate_notify_msg(exporter, so, "satisfies")
+
+        # The MultiStageBehMod needs to receive the avatar key that whatdonetriggeredit. We don't know
+        # this information at export-time, but plResponderModifier::IContinueSending will interpret
+        # a collision event as "ohey, let's add the avatar key for MSBs" - nice.
+        msg.addEvent(proCollisionEventData())
+        return msg
+
+
 class PlasmaFootstepSoundMsgNode(PlasmaMessageNode, bpy.types.Node):
     bl_category = "MSG"
     bl_idname = "PlasmaFootstepSoundMsgNode"