LineArt: Invert collection option.

Allows conveniently selecting an inverse of a collection.

Reviewed By: Antonio Vazquez (antoniov)

Differential Revision: https://developer.blender.org/D13846

2 files changed, 12 insertions, 3 deletions

diff --git a/source/blender/gpencil_modifiers/intern/MOD_gpencillineart.c b/source/blender/gpencil_modifiers/intern/MOD_gpencillineart.c
index b35ebd4be9a..59937bb0757 100644
--- a/source/blender/gpencil_modifiers/intern/MOD_gpencillineart.c
+++ b/source/blender/gpencil_modifiers/intern/MOD_gpencillineart.c
@@ -314,7 +314,9 @@ static void panel_draw(const bContext *UNUSED(C), Panel *panel)
     uiItemR(layout, ptr, "source_object", 0, NULL, ICON_OBJECT_DATA);
   }
   else if (source_type == LRT_SOURCE_COLLECTION) {
-    uiItemR(layout, ptr, "source_collection", 0, NULL, ICON_OUTLINER_COLLECTION);
+    uiLayout *sub = uiLayoutRow(layout, true);
+    uiItemR(sub, ptr, "source_collection", 0, NULL, ICON_OUTLINER_COLLECTION);
+    uiItemR(sub, ptr, "use_invert_collection", 0, "", ICON_ARROW_LEFTRIGHT);
   }
   else {
     /* Source is Scene. */
diff --git a/source/blender/gpencil_modifiers/intern/lineart/lineart_cpu.c b/source/blender/gpencil_modifiers/intern/lineart/lineart_cpu.c
index f08d35891ce..5461b80cad1 100644
--- a/source/blender/gpencil_modifiers/intern/lineart/lineart_cpu.c
+++ b/source/blender/gpencil_modifiers/intern/lineart/lineart_cpu.c
@@ -4363,8 +4363,15 @@ static void lineart_gpencil_generate(LineartCache *cache,
       continue;
     }
     if (orig_col && ec->object_ref) {
-      if (!BKE_collection_has_object_recursive_instanced(orig_col, (Object *)ec->object_ref)) {
-        continue;
+      if (BKE_collection_has_object_recursive_instanced(orig_col, (Object *)ec->object_ref)) {
+        if (modifier_flags & LRT_GPENCIL_INVERT_COLLECTION) {
+          continue;
+        }
+      }
+      else {
+        if (!(modifier_flags & LRT_GPENCIL_INVERT_COLLECTION)) {
+          continue;
+        }
       }
     }
     if (mask_switches & LRT_GPENCIL_MATERIAL_MASK_ENABLE) {