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, 78 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_material.c b/source/blender/makesrna/intern/rna_material.c
index 84c831a178e..39dd3059f3d 100644
--- a/source/blender/makesrna/intern/rna_material.c
+++ b/source/blender/makesrna/intern/rna_material.c
@@ -127,6 +127,14 @@ static void rna_MaterialGpencil_update(Main *bmain, Scene *scene, PointerRNA *pt
   WM_main_add_notifier(NC_GPENCIL | ND_DATA, ma);
 }
 
+static void rna_MaterialLineArt_update(Main *UNUSED(bmain), Scene *UNUSED(scene), PointerRNA *ptr)
+{
+  Material *ma = (Material *)ptr->owner_id;
+  /* Need to tag geometry for line art modifier updates. */
+  DEG_id_tag_update(&ma->id, ID_RECALC_GEOMETRY);
+  WM_main_add_notifier(NC_MATERIAL | ND_SHADING_DRAW, ma);
+}
+
 static void rna_Material_draw_update(Main *UNUSED(bmain), Scene *UNUSED(scene), PointerRNA *ptr)
 {
   Material *ma = (Material *)ptr->owner_id;
@@ -671,6 +679,70 @@ static void rna_def_material_greasepencil(BlenderRNA *brna)
   RNA_def_property_ui_text(
       prop, "Is Fill Visible", "True when opacity of fill is set high enough to be visible");
 }
+static void rna_def_material_lineart(BlenderRNA *brna)
+{
+  StructRNA *srna;
+  PropertyRNA *prop;
+
+  srna = RNA_def_struct(brna, "MaterialLineArt", NULL);
+  RNA_def_struct_sdna(srna, "MaterialLineArt");
+  RNA_def_struct_ui_text(srna, "Material Line Art", "");
+
+  prop = RNA_def_property(srna, "use_transparency", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_default(prop, 0);
+  RNA_def_property_boolean_sdna(prop, NULL, "flags", LRT_MATERIAL_TRANSPARENCY_ENABLED);
+  RNA_def_property_ui_text(
+      prop, "Use Transparency", "Use transparency mask from this material in Line Art");
+  RNA_def_property_update(prop, NC_GPENCIL | ND_SHADING, "rna_MaterialLineArt_update");
+
+  prop = RNA_def_property(srna, "transparency_mask_0", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_default(prop, 0);
+  RNA_def_property_boolean_sdna(prop, NULL, "transparency_mask", 1 << 0);
+  RNA_def_property_ui_text(prop, "Mask 0", "Mask bit 0");
+  RNA_def_property_update(prop, NC_GPENCIL | ND_SHADING, "rna_MaterialLineArt_update");
+
+  prop = RNA_def_property(srna, "transparency_mask_1", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_default(prop, 0);
+  RNA_def_property_boolean_sdna(prop, NULL, "transparency_mask", 1 << 1);
+  RNA_def_property_ui_text(prop, "Mask 1", "Mask bit 1");
+  RNA_def_property_update(prop, NC_GPENCIL | ND_SHADING, "rna_MaterialLineArt_update");
+
+  prop = RNA_def_property(srna, "transparency_mask_2", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_default(prop, 0);
+  RNA_def_property_boolean_sdna(prop, NULL, "transparency_mask", 1 << 2);
+  RNA_def_property_ui_text(prop, "Mask 2", "Mask bit 2");
+  RNA_def_property_update(prop, NC_GPENCIL | ND_SHADING, "rna_MaterialLineArt_update");
+
+  prop = RNA_def_property(srna, "transparency_mask_3", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_default(prop, 0);
+  RNA_def_property_boolean_sdna(prop, NULL, "transparency_mask", 1 << 3);
+  RNA_def_property_ui_text(prop, "Mask 3", "Mask bit 3");
+  RNA_def_property_update(prop, NC_GPENCIL | ND_SHADING, "rna_MaterialLineArt_update");
+
+  prop = RNA_def_property(srna, "transparency_mask_4", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_default(prop, 0);
+  RNA_def_property_boolean_sdna(prop, NULL, "transparency_mask", 1 << 4);
+  RNA_def_property_ui_text(prop, "Mask 4", "Mask bit 4");
+  RNA_def_property_update(prop, NC_GPENCIL | ND_SHADING, "rna_MaterialLineArt_update");
+
+  prop = RNA_def_property(srna, "transparency_mask_5", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_default(prop, 0);
+  RNA_def_property_boolean_sdna(prop, NULL, "transparency_mask", 1 << 5);
+  RNA_def_property_ui_text(prop, "Mask 5", "Mask bit 5");
+  RNA_def_property_update(prop, NC_GPENCIL | ND_SHADING, "rna_MaterialLineArt_update");
+
+  prop = RNA_def_property(srna, "transparency_mask_6", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_default(prop, 0);
+  RNA_def_property_boolean_sdna(prop, NULL, "transparency_mask", 1 << 6);
+  RNA_def_property_ui_text(prop, "mask 6", "Mask bit 6");
+  RNA_def_property_update(prop, NC_GPENCIL | ND_SHADING, "rna_MaterialLineArt_update");
+
+  prop = RNA_def_property(srna, "transparency_mask_7", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_default(prop, 0);
+  RNA_def_property_boolean_sdna(prop, NULL, "transparency_mask", 1 << 7);
+  RNA_def_property_ui_text(prop, "Mask 7", "Mask bit 7");
+  RNA_def_property_update(prop, NC_GPENCIL | ND_SHADING, "rna_MaterialLineArt_update");
+}
 
 void RNA_def_material(BlenderRNA *brna)
 {
@@ -836,7 +908,13 @@ void RNA_def_material(BlenderRNA *brna)
   RNA_def_property_ui_text(
       prop, "Is Grease Pencil", "True if this material has grease pencil data");
 
+  /* line art */
+  prop = RNA_def_property(srna, "lineart", PROP_POINTER, PROP_NONE);
+  RNA_def_property_pointer_sdna(prop, NULL, "lineart");
+  RNA_def_property_ui_text(prop, "Line Art Settings", "Line Art settings for material");
+
   rna_def_material_greasepencil(brna);
+  rna_def_material_lineart(brna);
 
   RNA_api_material(srna);
 }