Fix T88362: Lineart countour rendering error

This is caused by lacking of consideration of
OB_DUPLICOLLECTION in updateDepsgraph() in the
modifier.

Reviewed by: Antonio Vazquez (antoniov)

https://developer.blender.org/D11292

1 files changed, 19 insertions, 9 deletions

diff --git a/source/blender/gpencil_modifiers/intern/MOD_gpencillineart.c b/source/blender/gpencil_modifiers/intern/MOD_gpencillineart.c
index 080a3caa32f..c1a791d460b 100644
--- a/source/blender/gpencil_modifiers/intern/MOD_gpencillineart.c
+++ b/source/blender/gpencil_modifiers/intern/MOD_gpencillineart.c
@@ -194,6 +194,24 @@ static bool isDisabled(GpencilModifierData *md, int UNUSED(userRenderParams))
   return isModifierDisabled(md);
 }
 
+static void add_this_collection(Collection *c,
+                                const ModifierUpdateDepsgraphContext *ctx,
+                                const int mode)
+{
+  FOREACH_COLLECTION_VISIBLE_OBJECT_RECURSIVE_BEGIN (c, ob, mode) {
+    if (ELEM(ob->type, OB_MESH, OB_MBALL, OB_CURVE, OB_SURF, OB_FONT)) {
+      if (ob->lineart.usage != OBJECT_LRT_EXCLUDE) {
+        DEG_add_object_relation(ctx->node, ob, DEG_OB_COMP_GEOMETRY, "Line Art Modifier");
+        DEG_add_object_relation(ctx->node, ob, DEG_OB_COMP_TRANSFORM, "Line Art Modifier");
+      }
+    }
+    if (ob->type == OB_EMPTY && (ob->transflag & OB_DUPLICOLLECTION)) {
+      add_this_collection(ob->instance_collection, ctx, mode);
+    }
+  }
+  FOREACH_COLLECTION_VISIBLE_OBJECT_RECURSIVE_END;
+}
+
 static void updateDepsgraph(GpencilModifierData *md,
                             const ModifierUpdateDepsgraphContext *ctx,
                             const int mode)
@@ -208,15 +226,7 @@ static void updateDepsgraph(GpencilModifierData *md,
         ctx->node, lmd->source_object, DEG_OB_COMP_TRANSFORM, "Line Art Modifier");
   }
   else {
-    FOREACH_COLLECTION_VISIBLE_OBJECT_RECURSIVE_BEGIN (ctx->scene->master_collection, ob, mode) {
-      if (ELEM(ob->type, OB_MESH, OB_MBALL, OB_CURVE, OB_SURF, OB_FONT)) {
-        if (ob->lineart.usage != OBJECT_LRT_EXCLUDE) {
-          DEG_add_object_relation(ctx->node, ob, DEG_OB_COMP_GEOMETRY, "Line Art Modifier");
-          DEG_add_object_relation(ctx->node, ob, DEG_OB_COMP_TRANSFORM, "Line Art Modifier");
-        }
-      }
-    }
-    FOREACH_COLLECTION_VISIBLE_OBJECT_RECURSIVE_END;
+    add_this_collection(ctx->scene->master_collection, ctx, mode);
   }
   DEG_add_object_relation(
       ctx->node, ctx->scene->camera, DEG_OB_COMP_TRANSFORM, "Line Art Modifier");