draw_tool.py

@@ -11,11 +11,11 @@ def node_group_settings(ng_settings, op_settings):
     
     return
 
-class SCRIB_OT_draw_curves(bpy.types.Operator):
+class SCRIB_OT_draw(bpy.types.Operator):
     """
     Custom draw operation for hair curves
     """
-    bl_idname = "scribble_buddy.draw_curves"
+    bl_idname = "scribble_buddy.draw"
     bl_label = "Custom Draw"
     bl_options = {'REGISTER', 'UNDO'}
     
@@ -48,8 +48,8 @@ class SCRIB_OT_draw_curves(bpy.types.Operator):
     def invoke(self, context, event):
         utils.ensure_resources()
         if True:
-            SCRIB_OT_draw_curves.gp = None
-            SCRIB_OT_draw_curves.ng_process = bpy.data.node_groups['.scribble-buddy.processing']
+            SCRIB_OT_draw.gp = None
+            SCRIB_OT_draw.ng_process = bpy.data.node_groups['.scribble-buddy.processing']
 
             context.tool_settings.curve_paint_settings.curve_type = 'POLY' # TODO: restore later
             context.tool_settings.curve_paint_settings.depth_mode = 'SURFACE' # TODO: restore later
@@ -66,7 +66,7 @@ class ScribbleCurves(WorkSpaceTool):
     bl_space_type = 'VIEW_3D'
     bl_context_mode = 'EDIT_CURVES'
 
-    bl_idname = "scribble_buddy.draw_curves"
+    bl_idname = "scribble_buddy.draw"
     bl_label = "Scribble Draw"
     bl_description = (
         "Scribble on the visible surface"
@@ -74,17 +74,17 @@ class ScribbleCurves(WorkSpaceTool):
     bl_icon = "brush.gpencil_draw.draw"
     bl_widget = None
     bl_keymap = (
-        ("scribble_buddy.draw_curves", {"type": 'LEFTMOUSE', "value": 'CLICK_DRAG'},
+        ("scribble_buddy.draw", {"type": 'LEFTMOUSE', "value": 'CLICK_DRAG'},
          {"properties": [("wait_for_input", False)]}),
     )
 
     def draw_settings(context, layout, tool):
-        props = tool.operator_properties("scribble_buddy.draw_curves")
+        props = tool.operator_properties("scribble_buddy.draw")
         layout.prop(context.tool_settings.curve_paint_settings , "radius_max")
         layout.prop(props, "brush_color")
 
 classes = [
-    SCRIB_OT_draw_curves,
+    SCRIB_OT_draw,
 ]
 
 def register():

ops.py

@@ -24,12 +24,25 @@ class SCRIB_OT_new_scribble(bpy.types.Operator):
 
         surface_object = context.object if context.object in context.selected_objects else None
 
-        scribble_object = bpy.data.objects.new('Scribble', bpy.data.hair_curves.new('Scribble'))
-        context.collection.objects.link(scribble_object)
-        context.view_layer.objects.active = scribble_object
-        for ob in bpy.data.objects:
-            ob.select_set(False)
-        scribble_object.select_set(True)
+        name = 'Scribble'
+
+        if settings.curve_mode == 'GP':
+            bpy.ops.object.grease_pencil_add(type='EMPTY')
+            context.object.name = name
+            context.object.data.name = name
+            scribble_object = context.object
+        else:
+            if settings.curve_mode == 'CURVE':
+                scribble_data = bpy.data.curves.new(name, type='CURVE')
+                scribble_data.dimensions = '3D'
+            elif settings.curve_mode == 'CURVES':
+                scribble_data = bpy.data.hair_curves.new(name)
+            scribble_object = bpy.data.objects.new(name, scribble_data)
+            context.collection.objects.link(scribble_object)
+            context.view_layer.objects.active = scribble_object
+            for ob in bpy.data.objects:
+                ob.select_set(False)
+            scribble_object.select_set(True)
 
         # attach surface object pointer
         scribble_object['SCRIB_surface_object'] = surface_object
@@ -91,8 +104,14 @@ class SCRIB_OT_new_scribble(bpy.types.Operator):
             mod.show_group_selector = False
 
         # enter mode and tool context
-        bpy.ops.object.mode_set(mode='EDIT')
-        bpy.ops.wm.tool_set_by_id(name="scribble_buddy.draw_curves")
+            
+        if settings.curve_mode == 'GP':
+            bpy.ops.object.mode_set(mode='PAINT_GREASE_PENCIL')
+            bpy.ops.wm.tool_set_by_id(name="builtin.draw")
+            context.scene.tool_settings.gpencil_stroke_placement_view3d = 'SURFACE'
+        else:
+            bpy.ops.object.mode_set(mode='EDIT')
+            bpy.ops.wm.tool_set_by_id(name="scribble_buddy.draw")
 
         return {"FINISHED"}
         

settings.py

@@ -18,6 +18,19 @@ class SCRIB_Settings(bpy.types.PropertyGroup):
                                                ('SCRIBBLE', 'Scribble', 'Specify the style of the currently active scribble', '', 1),
                                                ('AUTO', 'Auto', 'Specify the style of either the active scribble or the preset depending on the context', '', 2),
                                                ])
+    
+    if 'experimental' in dir(bpy.context.preferences):
+        gpv3 = bpy.context.preferences.experimental.use_grease_pencil_version3
+    else:
+        gpv3 = False
+    curve_mode: bpy.props.EnumProperty(default='CURVES',
+                                       items= [('CURVE', 'Legacy', 'Use legacy curve type (Limited Support)', 'CURVE_DATA', 0),\
+                                               ('CURVES', 'Hair', 'Use hair curves (Fully supported)', 'CURVES_DATA', 1),
+                                               ('GP', 'Grease Pencil', 'Use Grease Pencil (Limited Support)', 'OUTLINER_OB_GREASEPENCIL', 2),
+                                               ] if gpv3 else 
+                                               [('CURVE', 'Legacy', 'Use legacy curve type (Limited Support)', 'CURVE_DATA', 0),\
+                                               ('CURVES', 'Hair', 'Use hair curves (Full Support)', 'CURVES_DATA', 1),
+                                               ])
     #preset_mode
 
 classes = [

ui.py

@@ -71,8 +71,11 @@ class SCRIB_PT_scribble_buddy_panel(bpy.types.Panel):
             else:
                 surface_object = context.object
             layout.label(text=surface_object.name, icon='OUTLINER_OB_SURFACE')
-        if surface_object:
-            layout.operator("scribble_buddy.new_scribble", icon='GREASEPENCIL')
+        
+        layout.prop(settings, 'curve_mode', expand=True)
+        if settings.curve_mode in ['CURVE', 'GP']:
+            layout.label(text='Curve mode does not support drawing on deformed geometry', icon='ERROR')
+        layout.operator("scribble_buddy.new_scribble", icon='GREASEPENCIL')
         
         settings_header, settings_panel = layout.panel("scribble_settings", default_closed=True)
         settings_header.label(text="Settings")