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, 40 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/gpencil.c b/source/blender/blenkernel/intern/gpencil.c
index 00dcaad83db..3b46672f9cd 100644
--- a/source/blender/blenkernel/intern/gpencil.c
+++ b/source/blender/blenkernel/intern/gpencil.c
@@ -1663,6 +1663,31 @@ bGPDlayer *BKE_gpencil_layer_active_get(bGPdata *gpd)
   return NULL;
 }
 
+bGPDlayer *BKE_gpencil_layer_get_by_name(bGPdata *gpd, char *name, int first_if_not_found)
+{
+  bGPDlayer *gpl;
+  int i = 0;
+
+  /* error checking */
+  if (ELEM(NULL, gpd, gpd->layers.first)) {
+    return NULL;
+  }
+
+  /* loop over layers until found (assume only one active) */
+  for (gpl = gpd->layers.first; gpl; gpl = gpl->next) {
+    if (STREQ(name, gpl->info)) {
+      return gpl;
+    }
+    i++;
+  }
+
+  /* no such layer */
+  if (first_if_not_found) {
+    return gpd->layers.first;
+  }
+  return NULL;
+}
+
 /**
  * Set active grease pencil layer.
  * \param gpd: Grease pencil data-block
@@ -2421,6 +2446,21 @@ int BKE_gpencil_object_material_index_get(Object *ob, Material *ma)
   return -1;
 }
 
+int BKE_gpencil_object_material_get_index_name(Object *ob, char *name)
+{
+  short *totcol = BKE_object_material_len_p(ob);
+  Material *read_ma = NULL;
+  for (short i = 0; i < *totcol; i++) {
+    read_ma = BKE_object_material_get(ob, i + 1);
+    /* Material names are like "MAMaterial.001" */
+    if (STREQ(name, &read_ma->id.name[2])) {
+      return i;
+    }
+  }
+
+  return -1;
+}
+
 /**
  * Create a default palette.
  * \param bmain: Main pointer