Add global seed node

README.md

@@ -6,6 +6,7 @@ generator without writing image batches.
 The node is registered as:
 
 - `prompt_builder / SxCP Prompt Builder`
+- `prompt_builder / SxCP Global Seed`
 - `prompt_builder / SxCP Seed Control`
 - `prompt_builder / SxCP Seed Locker`
 - `prompt_builder / SxCP Camera Control`
@@ -231,6 +232,13 @@ like an auto-labeled slot and can participate in couple/group casts. The outfit,
 scene, pose, expression, and composition can still change while the saved
 character appearance remains stable.
 
+`SxCP Global Seed` is the simplest reproducibility node. Set `global_seed`,
+connect its `seed` output to the prompt node's `seed` input, and connect its
+`seed_config` output to the prompt node's `seed_config` input. With the same
+row number, settings, category files, and sampler seed, this recreates the same
+prompt result. Manual fields and explicitly fixed per-axis or character-slot
+seeds still override the global seed for those parts.
+
 `SxCP Seed Control` outputs `seed_config`, which can be connected to the prompt
 builder's optional `seed_config` input. When an axis is set to `random`, the
 visible seed value is materialized before the workflow queues, and that exact
@@ -716,6 +724,14 @@ axis has its own mode plus seed value:
 The `Lock Random Seeds Now` button turns every current `random` axis into a
 visible concrete seed and switches those axes to `fixed`.
 
+For exact prompt reproduction, `SxCP Global Seed` is the shortest path:
+
+- Connect `seed` to the generator `seed` input.
+- Connect `seed_config` to the generator `seed_config` input.
+- Keep character `slot_seed=-1` when that character should follow the global
+  person seed; set `slot_seed` only when that character should be independently
+  pinned.
+
 For normal prompt iteration, `SxCP Seed Locker` is usually simpler:
 
 - `base_seed`: the seed whose character/location/etc. you want to keep.

__init__.py

@@ -317,6 +317,27 @@ class SxCPSeedControl:
         )
 
 
+class SxCPGlobalSeed:
+    @classmethod
+    def INPUT_TYPES(cls):
+        seed_spec = {"default": 20260614, "min": 0, "max": 0xFFFFFFFF, "step": 1}
+        return {
+            "required": {
+                "global_seed": ("INT", seed_spec),
+            }
+        }
+
+    RETURN_TYPES = ("INT", "STRING", "STRING")
+    RETURN_NAMES = ("seed", "seed_config", "summary")
+    FUNCTION = "build"
+    CATEGORY = "prompt_builder"
+
+    def build(self, global_seed):
+        seed = max(0, min(0xFFFFFFFF, int(global_seed)))
+        config = build_seed_lock_config_json(base_seed=seed, reroll_axis="none", reroll_seed=-1)
+        return seed, config, f"global seed {seed}; all axes locked"
+
+
 class SxCPSeedLocker:
     @classmethod
     def INPUT_TYPES(cls):
@@ -1457,6 +1478,7 @@ class SxCPInstaOFPromptPair:
 
 NODE_CLASS_MAPPINGS = {
     "SxCPPromptBuilder": SxCPPromptBuilder,
+    "SxCPGlobalSeed": SxCPGlobalSeed,
     "SxCPSeedControl": SxCPSeedControl,
     "SxCPSeedLocker": SxCPSeedLocker,
     "SxCPCameraControl": SxCPCameraControl,
@@ -1481,6 +1503,7 @@ NODE_CLASS_MAPPINGS.update(LOOP_NODE_CLASS_MAPPINGS)
 
 NODE_DISPLAY_NAME_MAPPINGS = {
     "SxCPPromptBuilder": "SxCP Prompt Builder",
+    "SxCPGlobalSeed": "SxCP Global Seed",
     "SxCPSeedControl": "SxCP Seed Control",
     "SxCPSeedLocker": "SxCP Seed Locker",
     "SxCPCameraControl": "SxCP Camera Control",