Geometry Nodes: new Geometry to Instance node

This adds a new Geometry to Instance node that turns every
connected input geometry into an instance. Those instances
can for example be used in the Instance on Points node.

Differential Revision: https://developer.blender.org/D13500

7 files changed, 61 insertions, 0 deletions

diff --git a/release/scripts/startup/nodeitems_builtins.py b/release/scripts/startup/nodeitems_builtins.py
index 7a4210f0d0c..bf75ebcd5d8 100644
--- a/release/scripts/startup/nodeitems_builtins.py
+++ b/release/scripts/startup/nodeitems_builtins.py
@@ -174,6 +174,7 @@ def geometry_node_items(context):
     yield NodeItem("GeometryNodeBoundBox")
     yield NodeItem("GeometryNodeConvexHull")
     yield NodeItem("GeometryNodeDeleteGeometry")
+    yield NodeItem("GeometryNodeGeometryToInstance")
     yield NodeItem("GeometryNodeProximity")
     yield NodeItem("GeometryNodeJoinGeometry")
     yield NodeItem("GeometryNodeRaycast")
diff --git a/source/blender/blenkernel/BKE_node.h b/source/blender/blenkernel/BKE_node.h
index f460aaf0d6a..4bfbffcbb1d 100644
--- a/source/blender/blenkernel/BKE_node.h
+++ b/source/blender/blenkernel/BKE_node.h
@@ -1715,6 +1715,7 @@ int ntreeTexExecTree(struct bNodeTree *ntree,
 #define GEO_NODE_INPUT_MESH_FACE_AREA 1139
 #define GEO_NODE_INPUT_MESH_FACE_NEIGHBORS 1140
 #define GEO_NODE_INPUT_MESH_VERTEX_NEIGHBORS 1141
+#define GEO_NODE_GEOMETRY_TO_INSTANCE 1142
 /** \} */
 
 /* -------------------------------------------------------------------- */
diff --git a/source/blender/blenkernel/intern/node.cc b/source/blender/blenkernel/intern/node.cc
index 14ba87d51eb..1efa4a2cdd2 100644
--- a/source/blender/blenkernel/intern/node.cc
+++ b/source/blender/blenkernel/intern/node.cc
@@ -5799,6 +5799,7 @@ static void registerGeometryNodes()
   register_node_type_geo_distribute_points_on_faces();
   register_node_type_geo_dual_mesh();
   register_node_type_geo_edge_split();
+  register_node_type_geo_geometry_to_instance();
   register_node_type_geo_image_texture();
   register_node_type_geo_input_curve_handles();
   register_node_type_geo_input_curve_tilt();
diff --git a/source/blender/nodes/NOD_geometry.h b/source/blender/nodes/NOD_geometry.h
index a64c53c32e1..0081cec0c2d 100644
--- a/source/blender/nodes/NOD_geometry.h
+++ b/source/blender/nodes/NOD_geometry.h
@@ -97,6 +97,7 @@ void register_node_type_geo_delete_geometry(void);
 void register_node_type_geo_distribute_points_on_faces(void);
 void register_node_type_geo_dual_mesh(void);
 void register_node_type_geo_edge_split(void);
+void register_node_type_geo_geometry_to_instance(void);
 void register_node_type_geo_image_texture(void);
 void register_node_type_geo_input_curve_handles(void);
 void register_node_type_geo_input_curve_tilt(void);
diff --git a/source/blender/nodes/NOD_static_types.h b/source/blender/nodes/NOD_static_types.h
index 5ef0fc52877..6adc6a45c77 100644
--- a/source/blender/nodes/NOD_static_types.h
+++ b/source/blender/nodes/NOD_static_types.h
@@ -350,6 +350,7 @@ DefNode(GeometryNode, GEO_NODE_DISTRIBUTE_POINTS_ON_FACES, def_geo_distribute_po
 DefNode(GeometryNode, GEO_NODE_DUAL_MESH, 0, "DUAL_MESH", DualMesh, "Dual Mesh", "")
 DefNode(GeometryNode, GEO_NODE_FILL_CURVE, def_geo_curve_fill, "FILL_CURVE", FillCurve, "Fill Curve", "")
 DefNode(GeometryNode, GEO_NODE_FILLET_CURVE, def_geo_curve_fillet, "FILLET_CURVE", FilletCurve, "Fillet Curve", "")
+DefNode(GeometryNode, GEO_NODE_GEOMETRY_TO_INSTANCE, 0, "GEOMETRY_TO_INSTANCE", GeometryToInstance, "Geometry to Instance", "")
 DefNode(GeometryNode, GEO_NODE_IMAGE_TEXTURE, def_geo_image_texture, "IMAGE_TEXTURE", ImageTexture, "Image Texture", "")
 DefNode(GeometryNode, GEO_NODE_INPUT_CURVE_HANDLES, 0, "INPUT_CURVE_HANDLES", InputCurveHandlePositions, "Curve Handle Positions", "")
 DefNode(GeometryNode, GEO_NODE_INPUT_CURVE_TILT, 0, "INPUT_CURVE_TILT", InputCurveTilt, "Curve Tilt", "")
diff --git a/source/blender/nodes/geometry/CMakeLists.txt b/source/blender/nodes/geometry/CMakeLists.txt
index 2d7e0293b62..de3184ab198 100644
--- a/source/blender/nodes/geometry/CMakeLists.txt
+++ b/source/blender/nodes/geometry/CMakeLists.txt
@@ -115,6 +115,7 @@ set(SRC
   nodes/node_geo_distribute_points_on_faces.cc
   nodes/node_geo_dual_mesh.cc
   nodes/node_geo_edge_split.cc
+  nodes/node_geo_geometry_to_instance.cc
   nodes/node_geo_image_texture.cc
   nodes/node_geo_input_curve_handles.cc
   nodes/node_geo_input_curve_tilt.cc
diff --git a/source/blender/nodes/geometry/nodes/node_geo_geometry_to_instance.cc b/source/blender/nodes/geometry/nodes/node_geo_geometry_to_instance.cc
new file mode 100644
index 00000000000..7faf104737f
--- /dev/null
+++ b/source/blender/nodes/geometry/nodes/node_geo_geometry_to_instance.cc
@@ -0,0 +1,55 @@
+/*
+ * 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.
+ */
+
+#include "node_geometry_util.hh"
+
+namespace blender::nodes::node_geo_geometry_to_instance_cc {
+
+static void node_declare(NodeDeclarationBuilder &b)
+{
+  b.add_input<decl::Geometry>(N_("Geometry")).multi_input();
+  b.add_output<decl::Geometry>(N_("Instances"));
+}
+
+static void node_geo_exec(GeoNodeExecParams params)
+{
+  Vector<GeometrySet> geometries = params.extract_multi_input<GeometrySet>("Geometry");
+  GeometrySet instances_geometry;
+  InstancesComponent &instances_component =
+      instances_geometry.get_component_for_write<InstancesComponent>();
+  for (GeometrySet &geometry : geometries) {
+    geometry.ensure_owns_direct_data();
+    const int handle = instances_component.add_reference(std::move(geometry));
+    instances_component.add_instance(handle, float4x4::identity());
+  }
+  params.set_output("Instances", std::move(instances_geometry));
+}
+
+}  // namespace blender::nodes::node_geo_geometry_to_instance_cc
+
+void register_node_type_geo_geometry_to_instance()
+{
+  namespace file_ns = blender::nodes::node_geo_geometry_to_instance_cc;
+
+  static bNodeType ntype;
+
+  geo_node_type_base(
+      &ntype, GEO_NODE_GEOMETRY_TO_INSTANCE, "Geometry to Instance", NODE_CLASS_GEOMETRY, 0);
+  node_type_size(&ntype, 160, 100, 300);
+  ntype.geometry_node_execute = file_ns::node_geo_exec;
+  ntype.declare = file_ns::node_declare;
+  nodeRegisterType(&ntype);
+}