Fix T80121: Forcefield F-curve modifier changes don't reset cache

Add a dependency graph relation Force Object Animation → Scene Rigid
Body World Rebuild. This ensures that the rigid body world is rebuilt
when a force object is re-tagged for animation updates.

The extra relation doesn't add any new calculations when the animation
is running, as the Time Source node already had a relation to the
scene's `RIGIDBODY_REBUILD` node.

The relation is created directly to the `RIGIDBODY_REBUILD` Operation. I
would have liked to target the containing Component instead. However,
that has the `RIGIDBODY_SIM` operation as entry node, which isn't enough
to actually fix T80121.

Reviewers: Sergey

Differential Revision: https://developer.blender.org/T80121

1 files changed, 1 insertions, 0 deletions

diff --git a/source/blender/depsgraph/intern/builder/deg_builder_relations.h b/source/blender/depsgraph/intern/builder/deg_builder_relations.h
index 39768b9fdb6..7f5e4cafeea 100644
--- a/source/blender/depsgraph/intern/builder/deg_builder_relations.h
+++ b/source/blender/depsgraph/intern/builder/deg_builder_relations.h
@@ -241,6 +241,7 @@ class DepsgraphRelationBuilder : public DepsgraphBuilder {
                                                OperationNode *operation_from,
                                                ListBase *strips);
   virtual void build_animdata_drivers(ID *id);
+  virtual void build_animdata_force(ID *id);
   virtual void build_animation_images(ID *id);
   virtual void build_action(bAction *action);
   virtual void build_driver(ID *id, FCurve *fcurve);