Depsgraph: build bbone operation if bone segments has animation

This is a part of T61296: Crash with animated b-bone segments.

Consider animated/driven bendy bones segments as something what requires
special bendy-bones operation and relation in the dependency graph.

This is because it is more beneficial from a performance point of view
to not build operations if they are not needed. But if the property is
animated it is not possible to make any reliable decision based on just
a property value.

Differential Revision: https://developer.blender.org/D4739

1 files changed, 3 insertions, 2 deletions

diff --git a/source/blender/depsgraph/intern/builder/deg_builder_rna.cc b/source/blender/depsgraph/intern/builder/deg_builder_rna.cc
index ac4e8e84d44..1238cdc70c6 100644
--- a/source/blender/depsgraph/intern/builder/deg_builder_rna.cc
+++ b/source/blender/depsgraph/intern/builder/deg_builder_rna.cc
@@ -197,8 +197,9 @@ RNANodeIdentifier RNANodeQuery::construct_node_identifier(const PointerRNA *ptr,
       node_identifier.type = NodeType::BONE;
       node_identifier.component_name = pchan->name;
       /* But B-Bone properties should connect to the actual operation. */
-      if (!ELEM(NULL, pchan->bone, prop) && pchan->bone->segments > 1 &&
-          STRPREFIX(RNA_property_identifier(prop), "bbone_")) {
+      Object *object = reinterpret_cast<Object *>(node_identifier.id);
+      if (!ELEM(NULL, pchan->bone, prop) && STRPREFIX(RNA_property_identifier(prop), "bbone_") &&
+          builder_->check_pchan_has_bbone_segments(object, pchan)) {
         node_identifier.operation_code = OperationCode::BONE_SEGMENTS;
       }
     }