UI: Make Custom Normal naming consistent

This changes the naming of "Custom Split Normals" or "Split Normals" to be "Custom Normals"

This addresses #134744, only UI naming has been adjusted.
Internal/External APIs are left unchanged.

Pull Request: https://projects.blender.org/blender/blender/pulls/140440

scripts/addons_core/io_scene_fbx/__init__.py

@@ -398,7 +398,7 @@ class ExportFBX(bpy.types.Operator, ExportHelper):
                ('SMOOTH_GROUP', "Smoothing Groups", "Write face smoothing groups"),
                ),
         description="Export smoothing information "
-        "(prefer 'Normals Only' option if your target importer understand split normals)",
+        "(prefer 'Normals Only' option if your target importer understands custom normals)",
         default='OFF',
     )
     colors_type: EnumProperty(

source/blender/editors/mesh/mesh_data.cc

@@ -739,9 +739,9 @@ static wmOperatorStatus mesh_customdata_custom_splitnormals_add_exec(bContext *C
 void MESH_OT_customdata_custom_splitnormals_add(wmOperatorType *ot)
 {
   /* identifiers */
-  ot->name = "Add Custom Split Normals Data";
+  ot->name = "Add Custom Normals Data";
   ot->idname = "MESH_OT_customdata_custom_splitnormals_add";
-  ot->description = "Add a custom split normals layer, if none exists yet";
+  ot->description = "Add a custom normals layer, if none exists yet";
 
   /* API callbacks. */
   ot->exec = mesh_customdata_custom_splitnormals_add_exec;
@@ -782,9 +782,9 @@ static wmOperatorStatus mesh_customdata_custom_splitnormals_clear_exec(bContext
 void MESH_OT_customdata_custom_splitnormals_clear(wmOperatorType *ot)
 {
   /* identifiers */
-  ot->name = "Clear Custom Split Normals Data";
+  ot->name = "Clear Custom Normals Data";
   ot->idname = "MESH_OT_customdata_custom_splitnormals_clear";
-  ot->description = "Remove the custom split normals layer, if it exists";
+  ot->description = "Remove the custom normals layer, if it exists";
 
   /* API callbacks. */
   ot->exec = mesh_customdata_custom_splitnormals_clear_exec;

source/blender/editors/transform/transform_ops.cc

@@ -1401,7 +1401,7 @@ static void TRANSFORM_OT_rotate_normal(wmOperatorType *ot)
 {
   /* Identifiers. */
   ot->name = "Rotate Normals";
-  ot->description = "Rotate split normal of selected items";
+  ot->description = "Rotate custom normal of selected items";
   ot->idname = OP_NORMAL_ROTATION;
   ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO | OPTYPE_BLOCKING;
 

source/blender/makesrna/intern/rna_mesh.cc

@@ -2189,8 +2189,8 @@ static void rna_def_mlooptri(BlenderRNA *brna)
   RNA_def_property_float_funcs(prop, "rna_MeshLoopTriangle_split_normals_get", nullptr, nullptr);
   RNA_def_property_ui_text(
       prop,
-      "Split Normals",
-      "Local space unit length split normal vectors of the face corners of this triangle");
+      "Custom Normals",
+      "Local space unit length custom normal vectors of the face corners of this triangle");
 
   prop = RNA_def_property(srna, "area", PROP_FLOAT, PROP_UNSIGNED);
   RNA_def_property_clear_flag(prop, PROP_EDITABLE);
@@ -3309,7 +3309,7 @@ static void rna_def_mesh(BlenderRNA *brna)
   RNA_def_property_boolean_sdna(prop, nullptr, "", 0);
   RNA_def_property_clear_flag(prop, PROP_EDITABLE);
   RNA_def_property_ui_text(
-      prop, "Has Custom Normals", "True if there are custom split normals data in this mesh");
+      prop, "Has Custom Normals", "True if there is custom normal data for this mesh");
   RNA_def_property_boolean_funcs(prop, "rna_Mesh_has_custom_normals_get", nullptr);
   RNA_define_verify_sdna(true);
 

source/blender/makesrna/intern/rna_mesh_api.cc

@@ -266,9 +266,9 @@ void RNA_api_mesh(StructRNA *srna)
   RNA_def_function_flag(func, FUNC_USE_REPORTS);
   RNA_def_function_ui_description(
       func,
-      "Compute tangents and bitangent signs, to be used together with the split normals "
+      "Compute tangents and bitangent signs, to be used together with the custom normals "
       "to get a complete tangent space for normal mapping "
-      "(split normals are also computed if not yet present)");
+      "(custom normals are also computed if not yet present)");
   RNA_def_string(func,
                  "uvmap",
                  nullptr,
@@ -305,7 +305,7 @@ void RNA_api_mesh(StructRNA *srna)
 
   func = RNA_def_function(srna, "normals_split_custom_set", "rna_Mesh_normals_split_custom_set");
   RNA_def_function_ui_description(func,
-                                  "Define custom split normals of this mesh "
+                                  "Define custom normals of this mesh "
                                   "(use zero-vectors to keep auto ones)");
   RNA_def_function_flag(func, FUNC_USE_REPORTS);
   /* TODO: see how array size of 0 works, this shouldn't be used. */
@@ -316,10 +316,9 @@ void RNA_api_mesh(StructRNA *srna)
   func = RNA_def_function(srna,
                           "normals_split_custom_set_from_vertices",
                           "rna_Mesh_normals_split_custom_set_from_vertices");
-  RNA_def_function_ui_description(
-      func,
-      "Define custom split normals of this mesh, from vertices' normals "
-      "(use zero-vectors to keep auto ones)");
+  RNA_def_function_ui_description(func,
+                                  "Define custom normals of this mesh, from vertices' normals "
+                                  "(use zero-vectors to keep auto ones)");
   RNA_def_function_flag(func, FUNC_USE_REPORTS);
   /* TODO: see how array size of 0 works, this shouldn't be used. */
   parm = RNA_def_float_array(func, "normals", 1, nullptr, -1.0f, 1.0f, "", "Normals", 0.0f, 0.0f);

source/blender/makesrna/intern/rna_modifier.cc

@@ -7812,7 +7812,7 @@ static void rna_def_modifier_weightednormal(BlenderRNA *brna)
   RNA_def_property_boolean_sdna(prop, nullptr, "flag", MOD_WEIGHTEDNORMAL_KEEP_SHARP);
   RNA_def_property_ui_text(prop,
                            "Keep Sharp",
-                           "Keep sharp edges as computed for default split normals, "
+                           "Keep sharp edges as computed for default custom normals, "
                            "instead of setting a single weighted normal for each vertex");
   RNA_def_property_update(prop, 0, "rna_Modifier_update");
 

source/blender/makesrna/intern/rna_space.cc

@@ -4967,7 +4967,7 @@ static void rna_def_space_view3d_overlay(BlenderRNA *brna)
   prop = RNA_def_property(srna, "show_split_normals", PROP_BOOLEAN, PROP_NONE);
   RNA_def_property_boolean_sdna(prop, nullptr, "overlay.edit_flag", V3D_OVERLAY_EDIT_LOOP_NORMALS);
   RNA_def_property_ui_text(
-      prop, "Display Split Normals", "Display vertex-per-face normals as lines");
+      prop, "Display Custom Normals", "Display vertex-per-face normals as lines");
   RNA_def_property_update(prop, NC_SPACE | ND_SPACE_VIEW3D, nullptr);
 
   prop = RNA_def_property(srna, "show_faces", PROP_BOOLEAN, PROP_NONE);

source/blender/makesrna/intern/rna_userdef.cc

@@ -2773,7 +2773,7 @@ static void rna_def_userdef_theme_space_view3d(BlenderRNA *brna)
   prop = RNA_def_property(srna, "split_normal", PROP_FLOAT, PROP_COLOR_GAMMA);
   RNA_def_property_float_sdna(prop, nullptr, "loop_normal");
   RNA_def_property_array(prop, 3);
-  RNA_def_property_ui_text(prop, "Split Normal", "");
+  RNA_def_property_ui_text(prop, "Custom Normal", "");
   RNA_def_property_update(prop, 0, "rna_userdef_update");
 
   /* Armature Object specific. */