Added operators for adding the data paths to Freestyle edge/face mark properties of

selected edges/polygons into the active keying set.  This makes it easy to keyframe
a number of Freestyle edge/face marks.

release/scripts/startup/bl_operators/freestyle.py

@@ -69,3 +69,65 @@ class SCENE_OT_freestyle_fill_range_by_selection(bpy.types.Operator):
             m.range_min = min_dist
             m.range_max = max_dist
         return {'FINISHED'}
+
+
+class SCENE_OT_freestyle_add_edge_marks_to_keying_set(bpy.types.Operator):
+    '''Add the data paths to the Freestyle Edge Mark property of selected edges to the active keying set'''
+    bl_idname = "scene.freestyle_add_edge_marks_to_keying_set"
+    bl_label = "Add Edge Marks to Keying Set"
+    bl_options = {'UNDO'}
+
+    @classmethod
+    def poll(cls, context):
+        ob = context.active_object
+        return (ob and ob.type == 'MESH')
+
+    def execute(self, context):
+        # active keying set
+        scene = context.scene
+        ks = scene.keying_sets.active
+        if ks is None:
+            ks = scene.keying_sets.new(idname="FreestyleEdgeMarkKeyingSet", name="Freestyle Edge Mark Keying Set")
+            ks.bl_description = ""
+        # add data paths to the keying set
+        ob = context.active_object
+        ob_mode = ob.mode
+        mesh = ob.data
+        bpy.ops.object.mode_set(mode='OBJECT', toggle=False)
+        for i, edge in enumerate(mesh.edges):
+            if not edge.hide and edge.select:
+                path = 'edges[%d].use_freestyle_edge_mark' % i
+                ks.paths.add(mesh, path, index=0)
+        bpy.ops.object.mode_set(mode=ob_mode, toggle=False)
+        return {'FINISHED'}
+
+
+class SCENE_OT_freestyle_add_face_marks_to_keying_set(bpy.types.Operator):
+    '''Add the data paths to the Freestyle Face Mark property of selected polygons to the active keying set'''
+    bl_idname = "scene.freestyle_add_face_marks_to_keying_set"
+    bl_label = "Add Face Marks to Keying Set"
+    bl_options = {'UNDO'}
+
+    @classmethod
+    def poll(cls, context):
+        ob = context.active_object
+        return (ob and ob.type == 'MESH')
+
+    def execute(self, context):
+        # active keying set
+        scene = context.scene
+        ks = scene.keying_sets.active
+        if ks is None:
+            ks = scene.keying_sets.new(idname="FreestyleFaceMarkKeyingSet", name="Freestyle Face Mark Keying Set")
+            ks.bl_description = ""
+        # add data paths to the keying set
+        ob = context.active_object
+        ob_mode = ob.mode
+        mesh = ob.data
+        bpy.ops.object.mode_set(mode='OBJECT', toggle=False)
+        for i, polygon in enumerate(mesh.polygons):
+            if not polygon.hide and polygon.select:
+                path = 'polygons[%d].use_freestyle_face_mark' % i
+                ks.paths.add(mesh, path, index=0)
+        bpy.ops.object.mode_set(mode=ob_mode, toggle=False)
+        return {'FINISHED'}

source/blender/makesrna/intern/rna_mesh.c

@@ -1596,6 +1596,11 @@ static void rna_def_mpolygon(BlenderRNA *brna)
 	RNA_def_property_ui_text(prop, "Smooth", "");
 	RNA_def_property_update(prop, 0, "rna_Mesh_update_data");
 
+	prop = RNA_def_property(srna, "use_freestyle_face_mark", PROP_BOOLEAN, PROP_NONE);
+	RNA_def_property_boolean_sdna(prop, NULL, "flag", ME_FREESTYLE_FACE);
+	RNA_def_property_ui_text(prop, "Freestyle Face Mark", "Face mark for Freestyle feature edge detection");
+	RNA_def_property_update(prop, 0, "rna_Mesh_update_data");
+
 	prop = RNA_def_property(srna, "normal", PROP_FLOAT, PROP_DIRECTION);
 	RNA_def_property_array(prop, 3);
 	RNA_def_property_range(prop, -1.0f, 1.0f);