Geometry Nodes: Handle multiple grids in the volume to mesh node

In future use cases, a volume can contain many grids that represent the
density information. In this case, it's better if the volume to mesh node
creates a mesh based on all of the grids in the volume.

This is also a benefit to share-ability, since one doesn't have to
specify the grid name in the node. Instead, in the future we can have
a way to split particular grids into separate volumes, if only one
grid should be considered.

The code changes are relatively simple:
 - Move the old volume to mesh node to the legacy folder.
 - Run the volume to mesh node on all instance geometry, like elsewhere.
 - Make the blenkernel's volume to mesh API a bit more specific.

Differential Revision: https://developer.blender.org/D12997

1 files changed, 1 insertions, 0 deletions

diff --git a/source/blender/nodes/NOD_geometry.h b/source/blender/nodes/NOD_geometry.h
index 6702443e20e..d6f0b511861 100644
--- a/source/blender/nodes/NOD_geometry.h
+++ b/source/blender/nodes/NOD_geometry.h
@@ -47,6 +47,7 @@ void register_node_type_geo_legacy_curve_subdivide(void);
 void register_node_type_geo_legacy_edge_split(void);
 void register_node_type_geo_legacy_subdivision_surface(void);
 void register_node_type_geo_legacy_raycast(void);
+void register_node_type_geo_legacy_volume_to_mesh(void);
 
 void register_node_type_geo_align_rotation_to_vector(void);
 void register_node_type_geo_attribute_capture(void);