Geometry Nodes: support instancing collections

The Point Instance node can instance entire collections now.
Before, only individual collections were supported.

Randomly selecting objects from the collection on a per point basis
is not support, yet.

Last part of D9739.

Ref T82372.

1 files changed, 12 insertions, 3 deletions

diff --git a/source/blender/blenkernel/BKE_geometry_set.hh b/source/blender/blenkernel/BKE_geometry_set.hh
index b7cb9320086..617e0c45ae4 100644
--- a/source/blender/blenkernel/BKE_geometry_set.hh
+++ b/source/blender/blenkernel/BKE_geometry_set.hh
@@ -35,6 +35,7 @@
 struct Mesh;
 struct PointCloud;
 struct Object;
+struct Collection;
 
 /* Each geometry component has a specific type. The type determines what kind of data the component
  * stores. Functions modifying a geometry will usually just modify a subset of the component types.
@@ -358,7 +359,7 @@ class InstancesComponent : public GeometryComponent {
   blender::Vector<blender::float3> positions_;
   blender::Vector<blender::float3> rotations_;
   blender::Vector<blender::float3> scales_;
-  blender::Vector<const Object *> objects_;
+  blender::Vector<InstancedData> instanced_data_;
 
  public:
   InstancesComponent();
@@ -366,12 +367,20 @@ class InstancesComponent : public GeometryComponent {
   GeometryComponent *copy() const override;
 
   void clear();
-  void add_instance(const Object *object,
+  void add_instance(Object *object,
                     blender::float3 position,
                     blender::float3 rotation = {0, 0, 0},
                     blender::float3 scale = {1, 1, 1});
+  void add_instance(Collection *collection,
+                    blender::float3 position,
+                    blender::float3 rotation = {0, 0, 0},
+                    blender::float3 scale = {1, 1, 1});
+  void add_instance(InstancedData data,
+                    blender::float3 position,
+                    blender::float3 rotation,
+                    blender::float3 scale);
 
-  blender::Span<const Object *> objects() const;
+  blender::Span<InstancedData> instanced_data() const;
   blender::Span<blender::float3> positions() const;
   blender::Span<blender::float3> rotations() const;
   blender::Span<blender::float3> scales() const;