Volumes: new Mesh to Volume modifier

This modifier can only be added to Volume objects. It takes a mesh
as input and generates a "density" grid near the surface or in
the enclosed volume.

Ref T73201.

Reviewers: brecht

Differential Revision: https://developer.blender.org/D9032

2 files changed, 78 insertions, 0 deletions

diff --git a/source/blender/makesrna/RNA_access.h b/source/blender/makesrna/RNA_access.h
index 10c122171e4..cfd87f14d48 100644
--- a/source/blender/makesrna/RNA_access.h
+++ b/source/blender/makesrna/RNA_access.h
@@ -389,6 +389,7 @@ extern StructRNA RNA_MaterialSlot;
 extern StructRNA RNA_Menu;
 extern StructRNA RNA_Mesh;
 extern StructRNA RNA_MeshCacheModifier;
+extern StructRNA RNA_MeshToVolumeModifier;
 extern StructRNA RNA_MeshColor;
 extern StructRNA RNA_MeshDeformModifier;
 extern StructRNA RNA_MeshEdge;
diff --git a/source/blender/makesrna/intern/rna_modifier.c b/source/blender/makesrna/intern/rna_modifier.c
index 0e83ee150d6..b433c938bd6 100644
--- a/source/blender/makesrna/intern/rna_modifier.c
+++ b/source/blender/makesrna/intern/rna_modifier.c
@@ -193,6 +193,11 @@ const EnumPropertyItem rna_enum_object_modifier_type_items[] = {
      ICON_MOD_WIREFRAME,
      "Wireframe",
      "Convert faces into thickened edges"},
+    {eModifierType_MeshToVolume,
+     "MESH_TO_VOLUME",
+     ICON_VOLUME_DATA,
+     "Mesh to Volume",
+     ""}, /* TODO: Use correct icon. */
     {0, "", 0, N_("Deform"), ""},
     {eModifierType_Armature,
      "ARMATURE",
@@ -6973,6 +6978,77 @@ static void rna_def_modifier_simulation(BlenderRNA *brna)
 }
 #  endif
 
+static void rna_def_modifier_mesh_to_volume(BlenderRNA *brna)
+{
+  StructRNA *srna;
+  PropertyRNA *prop;
+
+  static EnumPropertyItem resolution_mode_items[] = {
+      {MESH_TO_VOLUME_RESOLUTION_MODE_VOXEL_AMOUNT,
+       "VOXEL_AMOUNT",
+       0,
+       "Voxel Amount",
+       "Desired number of voxels along one axis"},
+      {MESH_TO_VOLUME_RESOLUTION_MODE_VOXEL_SIZE,
+       "VOXEL_SIZE",
+       0,
+       "Voxel Size",
+       "Desired voxel side length"},
+      {0, NULL, 0, NULL, NULL},
+  };
+
+  srna = RNA_def_struct(brna, "MeshToVolumeModifier", "Modifier");
+  RNA_def_struct_ui_text(srna, "Mesh to Volume Modifier", "");
+  RNA_def_struct_sdna(srna, "MeshToVolumeModifierData");
+  RNA_def_struct_ui_icon(srna, ICON_VOLUME_DATA); /* TODO: Use correct icon. */
+
+  RNA_define_lib_overridable(true);
+
+  prop = RNA_def_property(srna, "object", PROP_POINTER, PROP_NONE);
+  RNA_def_property_ui_text(prop, "Object", "Object");
+  RNA_def_property_flag(prop, PROP_EDITABLE | PROP_ID_SELF_CHECK);
+  RNA_def_property_update(prop, 0, "rna_Modifier_dependency_update");
+
+  prop = RNA_def_property(srna, "resolution_mode", PROP_ENUM, PROP_NONE);
+  RNA_def_property_enum_items(prop, resolution_mode_items);
+  RNA_def_property_ui_text(
+      prop, "Resolution Mode", "Mode for how the desired voxel size is specified");
+  RNA_def_property_update(prop, 0, "rna_Modifier_update");
+
+  prop = RNA_def_property(srna, "voxel_size", PROP_FLOAT, PROP_NONE);
+  RNA_def_property_ui_text(
+      prop, "Voxel Size", "Smaller values result in a higher resolution output");
+  RNA_def_property_range(prop, 0.1, FLT_MAX);
+  RNA_def_property_update(prop, 0, "rna_Modifier_update");
+
+  prop = RNA_def_property(srna, "voxel_amount", PROP_INT, PROP_NONE);
+  RNA_def_property_ui_text(prop, "Voxel Amount", "Approximate number of voxels along one axis");
+  RNA_def_property_range(prop, 0, INT_MAX);
+  RNA_def_property_update(prop, 0, "rna_Modifier_update");
+
+  prop = RNA_def_property(srna, "fill_volume", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_ui_text(
+      prop, "Fill Volume", "Initialize the density grid in every cell inside the enclosed volume");
+  RNA_def_property_update(prop, 0, "rna_Modifier_update");
+
+  prop = RNA_def_property(srna, "interior_band_width", PROP_FLOAT, PROP_NONE);
+  RNA_def_property_ui_text(prop, "Interior Band Width", "Width of the volume inside of the mesh");
+  RNA_def_property_range(prop, 0.0, FLT_MAX);
+  RNA_def_property_update(prop, 0, "rna_Modifier_update");
+
+  prop = RNA_def_property(srna, "exterior_band_width", PROP_FLOAT, PROP_NONE);
+  RNA_def_property_ui_text(prop, "Exterior Band Width", "Width of the volume outside of the mesh");
+  RNA_def_property_range(prop, 0.0, FLT_MAX);
+  RNA_def_property_update(prop, 0, "rna_Modifier_update");
+
+  prop = RNA_def_property(srna, "density", PROP_FLOAT, PROP_NONE);
+  RNA_def_property_ui_text(prop, "Density", "Density of the new volume");
+  RNA_def_property_range(prop, 0.0, FLT_MAX);
+  RNA_def_property_update(prop, 0, "rna_Modifier_update");
+
+  RNA_define_lib_overridable(false);
+}
+
 void RNA_def_modifier(BlenderRNA *brna)
 {
   StructRNA *srna;
@@ -7104,6 +7180,7 @@ void RNA_def_modifier(BlenderRNA *brna)
 #  ifdef WITH_PARTICLE_NODES
   rna_def_modifier_simulation(brna);
 #  endif
+  rna_def_modifier_mesh_to_volume(brna);
 }
 
 #endif