Fix T73254: Drivers with the object.dimension variable are not updated

This fixes an issue where drivers using `object.dimension` only add a dependency on `GEOMETRY` to the depsgraph, whereas they should also depend on `TRANSFORM`.

This patch adds a new no-op operation that depends on the geometry and transform components to the Parameters component.

An alternative implementation would be to have `RNANodeQuery::construct_node_identifier` return multiple node identifiers. However, this would spread throughout the depsgraph code and unnecessarily force many other functions to either return or handle multiple nodes where in 99.999% of the time a single node would suffice.

The new `DIMENSIONS` node is added for each object. An upcoming patch will go over all no-op operation nodes and remove them from the depsgraph. Since this is a more dangerous operation, it'll be reviewed separately.

Differential Revision: https://developer.blender.org/D7031

1 files changed, 1 insertions, 0 deletions

diff --git a/source/blender/depsgraph/intern/builder/deg_builder_nodes.h b/source/blender/depsgraph/intern/builder/deg_builder_nodes.h
index 54a4768d12a..7ddd8d0ade0 100644
--- a/source/blender/depsgraph/intern/builder/deg_builder_nodes.h
+++ b/source/blender/depsgraph/intern/builder/deg_builder_nodes.h
@@ -192,6 +192,7 @@ class DepsgraphNodeBuilder : public DepsgraphBuilder {
   virtual void build_driver_variables(ID *id, FCurve *fcurve);
   virtual void build_driver_id_property(ID *id, const char *rna_path);
   virtual void build_parameters(ID *id);
+  virtual void build_dimensions(Object *object);
   virtual void build_ik_pose(Object *object, bPoseChannel *pchan, bConstraint *con);
   virtual void build_splineik_pose(Object *object, bPoseChannel *pchan, bConstraint *con);
   virtual void build_rig(Object *object, bool is_object_visible);