diff --git a/CHANGELOG.md b/CHANGELOG.md
index def6b62..e711729 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,11 @@ Activate / deactivate layer opacity according to prefix
 Activate / deactivate all masks using MA layers
 -->
 
+1.8.1
+
+- added: `Reset Layer State` (Check layer) in Autobuild
+- added: environment variable `GP_RENDER_LAYER_GROUP_PATTERN` for layer merging regex pattern
+
 1.8.0
 
 - added: Allow to rename output on the fly using `connect selection to output`
diff --git a/OP_auto_build.py b/OP_auto_build.py
index c2248c6..b5829df 100644
--- a/OP_auto_build.py
+++ b/OP_auto_build.py
@@ -88,7 +88,7 @@ class GPEXP_OT_render_auto_build(bpy.types.Operator):
         description='Clean material stack. i.e: Replace "mat.001" in material stack if "mat" exists and has same color')
 
     prefix_filter : StringProperty(name='Prefix Filter', default='CO, CU, FX, TO', # , MA # exclude MA if mask are applied
-        description='Comma separated prefix to render. Set the other prefix and non-prefixed layer to exluded viewlayer')
+        description='Comma separated prefix to render, Layer with those prefix will be made visible')
 
     set_layers_colors : BoolProperty(name='Set Layers Colors', default=True,
         description='Set colors for on layers according to prefix (hadrcoded color set)')
@@ -102,6 +102,9 @@ class GPEXP_OT_render_auto_build(bpy.types.Operator):
     export_layer_infos : BoolProperty(name='Export Layer Infos', default=True,
         description='Export layers infos to a Json file')
 
+    reset_layers_state : BoolProperty(name='Reset Layer State', default=True,
+        description='Set layer opacity to 100%, Disable use light on all layer, set regular blend mode, hide invisible')
+
     group_all_adjacent_layer_type : BoolProperty(name='Group All Adjacent Layer Type', default=False,
         description='Fuse output Viewlayer according to adjacent Prefix in layer stack')
 
@@ -150,6 +153,7 @@ class GPEXP_OT_render_auto_build(bpy.types.Operator):
         col.prop(self, 'trigger_rename_lowercase')
         col.prop(self, 'trigger_renumber_by_distance')
         col.prop(self, 'export_layer_infos')
+        col.prop(self, 'reset_layers_state')
 
         col.label(text='Send prefixed layer to render scene (except excluded)')
         col.prop(self, 'excluded_prefix', text='Excluded')
@@ -246,6 +250,10 @@ class GPEXP_OT_render_auto_build(bpy.types.Operator):
             print('Export layer infos (skip if json already exists)')
             bpy.ops.gp.export_infos_for_compo('INVOKE_DEFAULT', skip_check=True)
 
+        ## Reset layer states -> 100% opacity (except mask layer 'MA' by default), remove use light, set default blend mode, hide material named "invisible".
+        if self.reset_layers_state:
+            bpy.ops.gp.layers_state()
+
         ## Set GP object data to single user (Individual viewlayers)
         if self.make_gp_single_user:
             for o in ob_list:
diff --git a/README.md b/README.md
index 29bb2ee..f02f33e 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,8 @@ Organise export of gp layers through compositor output
 
 `FILE_FORMAT` : Define file_format used for output. If not specified, use `OPEN_EXR_MULTILAYER` (set `OPEN_EXR` for separate sequences)
 
+`GP_RENDER_MERGE_PATTERN` : Regex pattern for GP layer group merge. If not specified, pattern is `^([A-Z]{2})_` to match gp_toolbox two-capital-letter prefix system)
+
 
 ### Notable operator arguments for automatisation
 
diff --git a/__init__.py b/__init__.py
index 783cc63..e608e74 100644
--- a/__init__.py
+++ b/__init__.py
@@ -2,7 +2,7 @@ bl_info = {
     "name": "GP Render",
     "description": "Organise export of gp layers through compositor output",
     "author": "Samuel Bernou",
-    "version": (1, 8, 0),
+    "version": (1, 8, 1),
     "blender": (3, 0, 0),
     "location": "View3D",
     "warning": "",
diff --git a/fn.py b/fn.py
index 59d43ef..5e952c1 100644
--- a/fn.py
+++ b/fn.py
@@ -1,13 +1,14 @@
-from typing import Coroutine
 import bpy
 import os
 import re
+import json
+
 from mathutils import Vector
 from pathlib import Path
+from itertools import groupby
 from math import isclose
 from collections import defaultdict
 from time import time
-import json
 
 from . constant import RD_SCENE_NAME
 
@@ -579,8 +580,8 @@ def group_adjacent_layer_prefix_rlayer(ob, excluded_prefix=[], first_name=True):
     :first_name: Keep the viewlayer of the bottom layer in group, else last
     '''
 
-    from itertools import groupby
-    re_prefix = re.compile(r'^([A-Z]{2})_')
+    pattern = os.environ.get('GP_RENDER_MERGE_PATTERN', r'^([A-Z]{2})_')
+    re_prefix = re.compile(pattern)
 
     if isinstance(excluded_prefix, str):
         excluded_prefix = [p.strip() for p in excluded_prefix.split(',')]