1 files changed, 8 insertions, 0 deletions
diff --git a/thirdparty/embree/kernels/bvh/bvh_node_aabb_mb4d.h b/thirdparty/embree/kernels/bvh/bvh_node_aabb_mb4d.h
index 46a81d7581..3b966fd054 100644
--- a/thirdparty/embree/kernels/bvh/bvh_node_aabb_mb4d.h
+++ b/thirdparty/embree/kernels/bvh/bvh_node_aabb_mb4d.h
@@ -41,6 +41,14 @@ namespace embree
       template<typename BuildRecord>
       __forceinline void operator() (const BuildRecord&, const BuildRecord*, NodeRef ref, NodeRecordMB4D* children, const size_t num) const
       {
+#if defined(DEBUG)
+        // check that empty children are only at the end of the child list
+        bool emptyChild = false;
+        for (size_t i=0; i<num; i++) {
+          emptyChild |= (children[i].ref == NodeRef::emptyNode);
+          assert(emptyChild == (children[i].ref == NodeRef::emptyNode));
+        }
+#endif
         if (likely(ref.isAABBNodeMB())) {
           for (size_t i=0; i<num; i++)
             ref.getAABBNodeMB()->set(i, children[i]);