preview gen in autobuild

1.3.1

- added: preview generation in autobuild

OP_auto_build.py

@@ -4,7 +4,7 @@ from pathlib import Path
 from . import gen_vlayer, fn
 
 
-def batch_setup_render_scene(context=None, render_scn=None):
+def batch_setup_render_scene(context=None, render_scn=None, preview=True):
     '''A series of setup actions for Render scene:
     - renumber fileout
     - Clean compo Tree
@@ -111,6 +111,8 @@ class GPEXP_OT_render_auto_build(bpy.types.Operator):
         \n- Swap to bg cam'
         )
 
+    add_preview : bpy.props.BoolProperty(name='Add Preview', default=True,
+        description='Create preview with stacked alpha over on render layers')
 
     def invoke(self, context, event):
         # return self.execute(context)
@@ -138,6 +140,7 @@ class GPEXP_OT_render_auto_build(bpy.types.Operator):
         col.prop(self, 'group_all_adjacent_layer_type')
         col.prop(self, 'change_to_gp_workspace')
         col.prop(self, 'batch_setup_render_scene')
+        col.prop(self, 'add_preview')
 
         # layout.prop(self, 'clear_unused_view_layers')
 
@@ -267,6 +270,12 @@ class GPEXP_OT_render_auto_build(bpy.types.Operator):
         ## Batch setup render scene
         batch_setup_render_scene(render_scn=render_scn)
 
+        ## create preview
+
+        if self.add_preview:
+            from .OP_merge_layers import merge_compositor_preview
+            merge_compositor_preview(scene=render_scn)
+
         ## No need for timer anymore !
         # if batch_setup_render_scene:
         #     if self.timer > 0: