UI: Tweak labels, descriptions, and panel layout for line art

Changes include:
 - Use `IFACE_` for UI labels set in the modifier panels
 - Use a sub-sub-panel for transparency
 - Fix grammar and spelling mistakes
 - Use more natural user-friendly wording
 - Make descriptions more specific and more useful
 - Don't capitalize "line art" in descriptions (tooltips)

These changes are aimed at making the UI strings more consistent with
the rest of the UI and being more helpful to someone trying to understand
how to use the modifier.

Differential Revision: https://developer.blender.org/D10750

1 files changed, 20 insertions, 16 deletions

diff --git a/source/blender/makesrna/intern/rna_object.c b/source/blender/makesrna/intern/rna_object.c
index 621245f2a68..77a4d636adc 100644
--- a/source/blender/makesrna/intern/rna_object.c
+++ b/source/blender/makesrna/intern/rna_object.c
@@ -164,17 +164,17 @@ const EnumPropertyItem rna_enum_object_gpencil_type_items[] = {
      "LRT_SCENE",
      ICON_SCENE_DATA,
      "Scene Line Art",
-     "Quickly set up Line Art for the whole scene"},
+     "Quickly set up line art for the entire scene"},
     {GP_LRT_COLLECTION,
      "LRT_COLLECTION",
      ICON_OUTLINER_COLLECTION,
      "Collection Line Art",
-     "Quickly set up Line Art for active collection"},
+     "Quickly set up line art for the active collection"},
     {GP_LRT_OBJECT,
      "LRT_OBJECT",
      ICON_OBJECT_DATA,
      "Object Line Art",
-     "Quickly set up Line Art for the active object"},
+     "Quickly set up line art for the active object"},
     {0, NULL, 0, NULL, NULL}};
 
 static const EnumPropertyItem parent_type_items[] = {
@@ -2673,23 +2673,27 @@ static void rna_def_object_lineart(BlenderRNA *brna)
   PropertyRNA *prop;
 
   static EnumPropertyItem prop_feature_line_usage_items[] = {
-      {OBJECT_LRT_INHERENT,
-       "INHEREIT",
+      {OBJECT_LRT_INHERENT, "INHEREIT", 0, "Inhereit", "Use settings from the parent collection"},
+      {OBJECT_LRT_INCLUDE,
+       "INCLUDE",
        0,
-       "Inhereit",
-       "Follow settings from the parent collection"},
-      {OBJECT_LRT_INCLUDE, "INCLUDE", 0, "Include", "Include this object into LRT calculation"},
+       "Include",
+       "Generate feature lines for this object's data"},
       {OBJECT_LRT_OCCLUSION_ONLY,
        "OCCLUSION_ONLY",
        0,
        "Occlusion Only",
-       "Don't produce lines, only used as occlusion object"},
-      {OBJECT_LRT_EXCLUDE, "EXCLUDE", 0, "Exclude", "Don't use this object for LRT rendering"},
+       "Only use the object data to produce occlusion"},
+      {OBJECT_LRT_EXCLUDE,
+       "EXCLUDE",
+       0,
+       "Exclude",
+       "Don't use this object for Line Art rendering"},
       {OBJECT_LRT_INTERSECTION_ONLY,
        "INTERSECTION_ONLY",
        0,
        "Intersection Only",
-       "Only to generate intersection lines with this object"},
+       "Only generate intersection lines for this collection"},
       {OBJECT_LRT_NO_INTERSECTION,
        "NO_INTERSECTION",
        0,
@@ -2699,7 +2703,7 @@ static void rna_def_object_lineart(BlenderRNA *brna)
   };
 
   srna = RNA_def_struct(brna, "ObjectLineArt", NULL);
-  RNA_def_struct_ui_text(srna, "Object Line Art", "Object lineart settings");
+  RNA_def_struct_ui_text(srna, "Object Line Art", "Object line art settings");
   RNA_def_struct_sdna(srna, "ObjectLineArt");
 
   prop = RNA_def_property(srna, "usage", PROP_ENUM, PROP_NONE);
@@ -2709,14 +2713,14 @@ static void rna_def_object_lineart(BlenderRNA *brna)
 
   prop = RNA_def_property(srna, "use_crease_override", PROP_BOOLEAN, PROP_NONE);
   RNA_def_property_boolean_sdna(prop, NULL, "flags", OBJECT_LRT_OWN_CREASE);
-  RNA_def_property_ui_text(prop, "Own Crease", "Use own crease setting to overwrite scene global");
+  RNA_def_property_ui_text(
+      prop, "Use Crease", "Use this object's crease setting to overwrite scene global");
   RNA_def_property_update(prop, 0, "rna_object_lineart_update");
 
   prop = RNA_def_property(srna, "crease_threshold", PROP_FLOAT, PROP_ANGLE);
   RNA_def_property_range(prop, 0, DEG2RAD(180.0f));
   RNA_def_property_ui_range(prop, 0.0f, DEG2RAD(180.0f), 0.01f, 1);
-  RNA_def_property_ui_text(
-      prop, "Own Crease", "Angles smaller than this will be treated as creases");
+  RNA_def_property_ui_text(prop, "Crease", "Angles smaller than this will be treated as creases");
   RNA_def_property_update(prop, 0, "rna_object_lineart_update");
 }
 
@@ -3492,7 +3496,7 @@ static void rna_def_object(BlenderRNA *brna)
   /* Line Art */
   prop = RNA_def_property(srna, "lineart", PROP_POINTER, PROP_NONE);
   RNA_def_property_struct_type(prop, "ObjectLineArt");
-  RNA_def_property_ui_text(prop, "Line Art", "Line Art settings for the object");
+  RNA_def_property_ui_text(prop, "Line Art", "Line art settings for the object");
 
   RNA_define_lib_overridable(false);