Geometry Nodes: Add Mesh To Volume Node

This adds a Mesh To Volume Node T86838 based on the existing modifier.
The mesh to volume conversion is implemented in the geometry module,
and shared between the node and the modifier.

Currently the node outputs a grid with the name "density". This may
change in the future depending on the decisions made in T91668.

The original patch was by Kris (@Metricity), further implementation
by Geramy Loveless (@GeramyLoveless), then finished by Erik Abrahamsson
(@erik85).

Differential Revision: https://developer.blender.org/D10895

1 files changed, 26 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_nodetree.c b/source/blender/makesrna/intern/rna_nodetree.c
index 1a8f47605a3..0ad109e711f 100644
--- a/source/blender/makesrna/intern/rna_nodetree.c
+++ b/source/blender/makesrna/intern/rna_nodetree.c
@@ -9970,6 +9970,32 @@ static void def_geo_volume_to_mesh(StructRNA *srna)
   RNA_def_property_update(prop, NC_NODE | NA_EDITED, "rna_Node_socket_update");
 }
 
+static void def_geo_mesh_to_volume(StructRNA *srna)
+{
+  PropertyRNA *prop;
+
+  static EnumPropertyItem resolution_mode_items[] = {
+      {MESH_TO_VOLUME_RESOLUTION_MODE_VOXEL_AMOUNT,
+       "VOXEL_AMOUNT",
+       0,
+       "Amount",
+       "Desired number of voxels along one axis"},
+      {MESH_TO_VOLUME_RESOLUTION_MODE_VOXEL_SIZE,
+       "VOXEL_SIZE",
+       0,
+       "Size",
+       "Desired voxel side length"},
+      {0, NULL, 0, NULL, NULL},
+  };
+
+  RNA_def_struct_sdna_from(srna, "NodeGeometryMeshToVolume", "storage");
+
+  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", "How the voxel size is specified");
+  RNA_def_property_update(prop, NC_NODE | NA_EDITED, "rna_Node_socket_update");
+}
+
 static void def_geo_mesh_circle(StructRNA *srna)
 {
   PropertyRNA *prop;