Geometry Nodes: Experimental rigid body integration.

This is an exploration of how geometry nodes might be coupled with
rigid bodies and iterative simulations in general. It's a very
rough-and-ready implementation, not meant as a final version, but rather
to prove the possiblity and to find challenging areas where redesign is
needed.

The core additions are:
- Geometry nodes to flag points and/or instances as rigid bodies.
- Depsgraph integration to ensure the necessary order of operations
    between modifiers and rigid body pre/post simulation updates.
- Simple cache feature to store arbitrary geometry and loop back into
    the next iteration.

1 files changed, 2 insertions, 1 deletions

diff --git a/source/blender/blenkernel/BKE_geometry_set.h b/source/blender/blenkernel/BKE_geometry_set.h
index a28e9e6bdf6..845825780c3 100644
--- a/source/blender/blenkernel/BKE_geometry_set.h
+++ b/source/blender/blenkernel/BKE_geometry_set.h
@@ -23,9 +23,10 @@ typedef enum GeometryComponentType {
   GEO_COMPONENT_TYPE_INSTANCES = 2,
   GEO_COMPONENT_TYPE_VOLUME = 3,
   GEO_COMPONENT_TYPE_CURVE = 4,
+  GEO_COMPONENT_TYPE_SIMULATION = 5,
 } GeometryComponentType;
 
-#define GEO_COMPONENT_TYPE_ENUM_SIZE 5
+#define GEO_COMPONENT_TYPE_ENUM_SIZE 6
 
 void BKE_geometry_set_free(struct GeometrySet *geometry_set);