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diff --git a/intern/cycles/bvh/unaligned.h b/intern/cycles/bvh/unaligned.h
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+/*
+ * Copyright 2011-2016 Blender Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __BVH_UNALIGNED_H__
+#define __BVH_UNALIGNED_H__
+
+#include "util/vector.h"
+
+CCL_NAMESPACE_BEGIN
+
+class BoundBox;
+class BVHObjectBinning;
+class BVHRange;
+class BVHReference;
+struct Transform;
+class Object;
+
+/* Helper class to perform calculations needed for unaligned nodes. */
+class BVHUnaligned {
+ public:
+  BVHUnaligned(const vector<Object *> &objects);
+
+  /* Calculate alignment for the oriented node for a given range. */
+  Transform compute_aligned_space(const BVHObjectBinning &range,
+                                  const BVHReference *references) const;
+  Transform compute_aligned_space(const BVHRange &range, const BVHReference *references) const;
+
+  /* Calculate alignment for the oriented node for a given reference.
+   *
+   * Return true when space was calculated successfully.
+   */
+  bool compute_aligned_space(const BVHReference &ref, Transform *aligned_space) const;
+
+  /* Calculate primitive's bounding box in given space. */
+  BoundBox compute_aligned_prim_boundbox(const BVHReference &prim,
+                                         const Transform &aligned_space) const;
+
+  /* Calculate bounding box in given space. */
+  BoundBox compute_aligned_boundbox(const BVHObjectBinning &range,
+                                    const BVHReference *references,
+                                    const Transform &aligned_space,
+                                    BoundBox *cent_bounds = NULL) const;
+  BoundBox compute_aligned_boundbox(const BVHRange &range,
+                                    const BVHReference *references,
+                                    const Transform &aligned_space,
+                                    BoundBox *cent_bounds = NULL) const;
+
+  /* Calculate affine transform for node packing.
+   * Bounds will be in the range of 0..1.
+   */
+  static Transform compute_node_transform(const BoundBox &bounds, const Transform &aligned_space);
+
+ protected:
+  /* List of objects BVH is being created for. */
+  const vector<Object *> &objects_;
+};
+
+CCL_NAMESPACE_END
+
+#endif /* __BVH_UNALIGNED_H__ */