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, 70 insertions, 0 deletions

diff --git a/source/blender/makesdna/DNA_lineart_types.h b/source/blender/makesdna/DNA_lineart_types.h
new file mode 100644
index 00000000000..2eb36cfb9d3
--- /dev/null
+++ b/source/blender/makesdna/DNA_lineart_types.h
@@ -0,0 +1,70 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2010 Blender Foundation.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): none yet.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#ifndef __DNA_LRT_TYPES_H__
+#define __DNA_LRT_TYPES_H__
+
+/** \file DNA_lineart_types.h
+ *  \ingroup DNA
+ */
+
+#include "DNA_ID.h"
+#include "DNA_listBase.h"
+
+struct Object;
+struct Material;
+
+/* Notice that we need to have this file although no struct defines.
+ * Edge flags and usage flags are used by with scene/object/gpencil modifier bits, and those values
+ * needs to stay consistent throughout. */
+
+typedef enum eLineartMainFlags {
+  LRT_INTERSECTION_AS_CONTOUR = (1 << 0),
+  LRT_EVERYTHING_AS_CONTOUR = (1 << 1),
+  LRT_ALLOW_DUPLI_OBJECTS = (1 << 2),
+  LRT_ALLOW_OVERLAPPING_EDGES = (1 << 3),
+  LRT_ALLOW_CLIPPING_BOUNDARIES = (1 << 4),
+  LRT_REMOVE_DOUBLES = (1 << 5),
+} eLineartMainFlags;
+
+typedef enum eLineartEdgeFlag {
+  LRT_EDGE_FLAG_EDGE_MARK = (1 << 0),
+  LRT_EDGE_FLAG_CONTOUR = (1 << 1),
+  LRT_EDGE_FLAG_CREASE = (1 << 2),
+  LRT_EDGE_FLAG_MATERIAL = (1 << 3),
+  LRT_EDGE_FLAG_INTERSECTION = (1 << 4),
+  /**  floating edge, unimplemented yet */
+  LRT_EDGE_FLAG_FLOATING = (1 << 5),
+  /**  also used as discarded line mark */
+  LRT_EDGE_FLAG_CHAIN_PICKED = (1 << 6),
+  LRT_EDGE_FLAG_CLIPPED = (1 << 7),
+  /* Maxed out for 8 bits, DON'T ADD ANYMORE until improvements on the data structure. */
+} eLineartEdgeFlag;
+
+#define LRT_EDGE_FLAG_ALL_TYPE 0x3f
+
+#endif