Grease Pencil: Add LineArt modifier

This adds the LineArt grease pencil modifier.

It takes objects or collections as input and generates various grease
pencil lines from these objects with the help of the active scene
camera. For example it can generate contour lines, intersection lines
and crease lines to name a few.

This is really useful as artists can then use 3D meshes to automatically
generate grease pencil lines for characters, enviroments or other
visualization purposes.

These lines can then be baked and edited as regular grease pencil lines.

Reviewed By: Sebastian Parborg, Antonio Vazquez, Matias Mendiola

Differential Revision: http://developer.blender.org/D8758

1 files changed, 3 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_collection.h b/source/blender/blenkernel/BKE_collection.h
index d15aebfe03d..d0fca5e3796 100644
--- a/source/blender/blenkernel/BKE_collection.h
+++ b/source/blender/blenkernel/BKE_collection.h
@@ -82,6 +82,8 @@ struct Collection *BKE_collection_master_add(void);
 
 bool BKE_collection_has_object(struct Collection *collection, const struct Object *ob);
 bool BKE_collection_has_object_recursive(struct Collection *collection, struct Object *ob);
+bool BKE_collection_has_object_recursive_instanced(struct Collection *collection,
+                                                   struct Object *ob);
 struct Collection *BKE_collection_object_find(struct Main *bmain,
                                               struct Scene *scene,
                                               struct Collection *collection,
@@ -123,6 +125,7 @@ bool BKE_collection_object_cyclic_check(struct Main *bmain,
 /* Object list cache. */
 
 struct ListBase BKE_collection_object_cache_get(struct Collection *collection);
+ListBase BKE_collection_object_cache_instanced_get(struct Collection *collection);
 void BKE_collection_object_cache_free(struct Collection *collection);
 
 struct Base *BKE_collection_or_layer_objects(const struct ViewLayer *view_layer,