Clean GP material stack

1.1.3

- added: clean material stack in auto-build

CHANGELOG.md

@@ -14,6 +14,10 @@ Activate / deactivate layer opacity according to prefix
 Activate / deactivate all masks using MA layers
 -->
 
+1.1.3
+
+- added: clean material stack in auto-build
+
 1.1.2
 
 - added: popup panel with options for autobuild

OP_auto_build.py

@@ -64,8 +64,11 @@ class GPEXP_OT_render_auto_build(bpy.types.Operator):
     clean_name_and_visibility : bpy.props.BoolProperty(name='Clean Name And Visibility', default=True, 
         description='Add object name to layer name when there is only prefix (ex: "CO_")\
             \nEnable visibility for layer with prefix included in Prefix Filter')
+    
+    clean_material_duplication : bpy.props.BoolProperty(name='Clean Material Duplication', default=True, 
+        description='Clean material stack. i.e: Replace "mat.001" in material stack if "mat" exists and has same color')
 
-    prefix_filter : bpy.props.StringProperty(name='Prefix Filter', default='CO, CU, FX, TO, MA',
+    prefix_filter : bpy.props.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')
 
     set_layers_colors : bpy.props.BoolProperty(name='Set Layers Colors', default=True, 
@@ -98,6 +101,7 @@ class GPEXP_OT_render_auto_build(bpy.types.Operator):
         layout = self.layout
         col = layout.column()
         col.prop(self, 'clean_name_and_visibility')
+        col.prop(self, 'clean_material_duplication')
         row = col.row()
         row.prop(self, 'prefix_filter')
         row.active = self.clean_name_and_visibility
@@ -129,9 +133,10 @@ class GPEXP_OT_render_auto_build(bpy.types.Operator):
             self.report({'ERROR'}, 'A "Render" scene already exists')
             return {'CANCELLED'}
         
+        all_gp_objects = [o for o in context.scene.objects if o.type == 'GPENCIL']
         ## clean name and visibility
         if self.clean_name_and_visibility:
-            for o in [o for o in context.scene.objects if o.type == 'GPENCIL']:
+            for o in all_gp_objects:
                 if o.hide_render:
                     print(f'skip: {o.name} hide render')
                     continue
@@ -145,8 +150,13 @@ class GPEXP_OT_render_auto_build(bpy.types.Operator):
                         if res.group(1) in prefix_to_render and l.hide == True:
                             print(f'{o.name} -> {l.info} : Switch visibility On')
                             l.hide = False
-        
-        ob_list = [o for o in context.scene.objects if o.type == 'GPENCIL' and not o.hide_get() and fn.is_valid_name(o.name)]
+
+        if self.clean_material_duplication:
+            print('Clean material duplicates')
+            for ob in all_gp_objects:
+                fn.clean_mats_duplication(ob)
+
+        ob_list = [o for o in all_gp_objects if not o.hide_get() and fn.is_valid_name(o.name)]
         if not ob_list:
             self.report({'ERROR'}, 'No GP object to render found')
             return {'CANCELLED'}

__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, 1, 2),
+    "version": (1, 1, 3),
     "blender": (2, 93, 0),
     "location": "View3D",
     "warning": "",

fn.py

@@ -1576,4 +1576,64 @@ def set_layer_colors(skip_if_colored=False):
             print(l.info, '->', color)
             l.channel_color = color
     
-    bpy.context.preferences.edit.use_anim_channel_group_colors = True
+    bpy.context.preferences.edit.use_anim_channel_group_colors = True
+
+
+def different_gp_mat(mata, matb):
+    '''return None if no difference (False), string describing color difference (True)'''
+    a = mata.grease_pencil
+    b = matb.grease_pencil
+    if a.color[:] != b.color[:]:
+        return f'{mata.name} and {matb.name} stroke color is different'
+    if a.fill_color[:] != b.fill_color[:]:
+        return f'{mata.name} and {matb.name} fill_color color is different'
+    if a.show_stroke != b.show_stroke:
+        return f'{mata.name} and {matb.name} stroke has different state'
+    if a.show_fill != b.show_fill:
+        return f'{mata.name} and {matb.name} fill has different state'
+
+## Clean dups
+def clean_mats_duplication(ob, skip_different_materials=True):
+    '''Clean object material stack of duplication
+    if a material is named "mat.001" and a "mat" exists, replace with the one with original name
+
+    :skip_different_materials: Don't replace a "mat.???" if orignal "mat" has different color
+    '''
+
+    import re
+    diff_ct = 0
+    todel = []
+    if ob.type != 'GPENCIL':
+        return
+    if not hasattr(ob, 'material_slots'):
+        return
+    for i, ms in enumerate(ob.material_slots):
+        mat = ms.material
+        if not mat:
+            continue
+        match = re.search(r'(.*)\.\d{3}$', mat.name)
+        if not match:
+            continue
+        basemat = bpy.data.materials.get(match.group(1))
+        if not basemat:
+            continue
+        diff = different_gp_mat(mat, basemat)
+        if diff:
+            print(f'! {ob.name} : {diff}')
+            diff_ct += 1
+            if skip_different_materials:
+                continue
+
+        if mat not in todel:
+            todel.append(mat)
+        ms.material = basemat
+        print(f'{ob.name} : slot {i} >> replaced {mat.name}')
+        mat.use_fake_user = False
+
+    ### delete (only when using on all objects loop, else can delete another objects mat...)
+    ## for m in reversed(todel):
+    ##     bpy.data.materials.remove(m)
+
+    if diff_ct:
+        print(f'{diff_ct} mat skipped >> same name but different color settings!')
+        # return ('INFO', f'{diff_ct} mat skipped >> same name but different color settings!')