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diff --git a/extern/draco/draco/src/draco/compression/attributes/points_sequencer.h b/extern/draco/draco/src/draco/compression/attributes/points_sequencer.h
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+// Copyright 2016 The Draco Authors.
+//
+// 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 DRACO_COMPRESSION_ATTRIBUTES_POINTS_SEQUENCER_H_
+#define DRACO_COMPRESSION_ATTRIBUTES_POINTS_SEQUENCER_H_
+
+#include <vector>
+
+#include "draco/attributes/point_attribute.h"
+
+namespace draco {
+
+// Class for generating a sequence of point ids that can be used to encode
+// or decode attribute values in a specific order.
+// See sequential_attribute_encoders/decoders_controller.h for more details.
+class PointsSequencer {
+ public:
+  PointsSequencer() : out_point_ids_(nullptr) {}
+  virtual ~PointsSequencer() = default;
+
+  // Fills the |out_point_ids| with the generated sequence of point ids.
+  bool GenerateSequence(std::vector<PointIndex> *out_point_ids) {
+    out_point_ids_ = out_point_ids;
+    return GenerateSequenceInternal();
+  }
+
+  // Appends a point to the sequence.
+  void AddPointId(PointIndex point_id) { out_point_ids_->push_back(point_id); }
+
+  // Sets the correct mapping between point ids and value ids. I.e., the inverse
+  // of the |out_point_ids|. In general, |out_point_ids_| does not contain
+  // sufficient information to compute the inverse map, because not all point
+  // ids are necessarily contained within the map.
+  // Must be implemented for sequencers that are used by attribute decoders.
+  virtual bool UpdatePointToAttributeIndexMapping(PointAttribute * /* attr */) {
+    return false;
+  }
+
+ protected:
+  // Method that needs to be implemented by the derived classes. The
+  // implementation is responsible for filling |out_point_ids_| with the valid
+  // sequence of point ids.
+  virtual bool GenerateSequenceInternal() = 0;
+  std::vector<PointIndex> *out_point_ids() const { return out_point_ids_; }
+
+ private:
+  std::vector<PointIndex> *out_point_ids_;
+};
+
+}  // namespace draco
+
+#endif  // DRACO_COMPRESSION_ATTRIBUTES_POINTS_SEQUENCER_H_