USD Importer Xform merge bug fix.

Disallow merging if parent isn't a UsdGeomXform.

2 files changed, 13 insertions, 4 deletions

diff --git a/source/blender/io/usd/import/usd_reader_xformable.cc b/source/blender/io/usd/import/usd_reader_xformable.cc
index 7a830269f00..2d96effa0c1 100644
--- a/source/blender/io/usd/import/usd_reader_xformable.cc
+++ b/source/blender/io/usd/import/usd_reader_xformable.cc
@@ -76,6 +76,18 @@ void USDXformableReader::eval_merged_with_parent()
   }
 }
 
+bool USDXformableReader::can_merge_with_parent() const
+{
+  bool can_merge = false;
+
+  if (valid()) {
+    pxr::UsdPrim parent = prim_.GetParent();
+    can_merge = parent && !parent.IsPseudoRoot() && parent.IsA<pxr::UsdGeomXform>();
+  }
+
+  return can_merge;
+}
+
 void USDXformableReader::set_object_transform(const double time, CacheFile *cache_file)
 {
   if (!object_) {
diff --git a/source/blender/io/usd/import/usd_reader_xformable.h b/source/blender/io/usd/import/usd_reader_xformable.h
index 4f21f153482..65511f8b092 100644
--- a/source/blender/io/usd/import/usd_reader_xformable.h
+++ b/source/blender/io/usd/import/usd_reader_xformable.h
@@ -99,10 +99,7 @@ class USDXformableReader : public USDPrimReader {
 
   virtual void create_object(Main *bmain, double time, USDDataCache *data_cache) = 0;
 
-  virtual bool can_merge_with_parent() const
-  {
-    return true;
-  }
+  virtual bool can_merge_with_parent() const;
 
   void set_object_transform(const double time, CacheFile *cache_file = nullptr);