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+<p align="center">
+<img width="350px" src="docs/artwork/draco3d-vert.svg" />
+</p>
+
+[![Build Status](https://github.com/google/draco/workflows/Build/badge.svg)](https://github.com/google/draco/actions?query=workflow%3ABuild)
+
+News
+=======
+### Version 1.4.1 release
+* Using the versioned www.gstatic.com WASM and Javascript decoders is now
+  recommended. To use v1.4.1, use this URL:
+  * https://www.gstatic.com/draco/versioned/decoders/1.4.1/*
+    * Replace the * with the files to load. E.g.
+    * https://www.gstatic.com/draco/versioned/decoders/1.4.1/draco_decoder.js
+  * This works with the v1.3.6 and v1.4.0 releases, and will work with future
+    Draco releases.
+* Bug fixes
+
+### Version 1.4.0 release
+* WASM and JavaScript decoders are hosted from a static URL.
+  * It is recommended to always pull your Draco WASM and JavaScript decoders from this URL:
+  * https://www.gstatic.com/draco/v1/decoders/*
+    * Replace * with the files to load. E.g.
+    * https://www.gstatic.com/draco/v1/decoders/draco_decoder_gltf.wasm
+  * Users will benefit from having the Draco decoder in cache as more sites start using the static URL
+* Changed npm modules to use WASM, which increased performance by ~200%.
+* Updated Emscripten to 2.0.
+  * This causes the Draco codec modules to return a promise instead of the module directly.
+  * Please see the example code on how to handle the promise.
+* Changed NORMAL quantization default to 8.
+* Added new array API to decoder and deprecated DecoderBuffer.
+  * See PR https://github.com/google/draco/issues/513 for more information.
+* Changed WASM/JavaScript behavior of catching exceptions.
+  * See issue https://github.com/google/draco/issues/629 for more information.
+* Code cleanup.
+* Emscripten builds now disable NODEJS_CATCH_EXIT and NODEJS_CATCH_REJECTION.
+  * Authors of a CLI tool might want to add their own error handlers.
+* Added Maya plugin builds.
+* Unity plugin builds updated.
+  * Builds are now stored as archives.
+  * Added iOS build.
+  * Unity users may want to look into https://github.com/atteneder/DracoUnity.
+* Bug fixes.
+
+### Version 1.3.6 release
+* WASM and JavaScript decoders are now hosted from a static URL
+  * It is recommended to always pull your Draco WASM and JavaScript decoders from this URL:
+  * https://www.gstatic.com/draco/v1/decoders/*
+    * Replace * with the files to load. E.g.
+    * https://www.gstatic.com/draco/v1/decoders/draco_decoder_gltf.wasm
+  * Users will benefit from having the Draco decoder in cache as more sites start using the static URL
+* Changed web examples to pull Draco decoders from static URL
+* Added new API to Draco WASM decoder, which increased performance by ~15%
+* Decreased Draco WASM decoder size by ~20%
+* Added support for generic and multiple attributes to Draco Unity plug-ins
+* Added new API to Draco Unity, which increased decoder performance by ~15%
+* Changed quantization defaults:
+  * POSITION: 11
+  * NORMAL: 7
+  * TEX_COORD: 10
+  * COLOR: 8
+  * GENERIC: 8
+* Code cleanup
+* Bug fixes
+
+### Version 1.3.5 release
+* Added option to build Draco for Universal Scene Description
+* Code cleanup
+* Bug fixes
+
+### Version 1.3.4 release
+* Released Draco Animation code
+* Fixes for Unity
+* Various file location and name changes
+
+### Version 1.3.3 release
+* Added ExpertEncoder to the Javascript API
+  * Allows developers to set quantization options per attribute id
+* Bug fixes
+
+### Version 1.3.2 release
+* Bug fixes
+
+### Version 1.3.1 release
+* Fix issue with multiple attributes when skipping an attribute transform
+
+### Version 1.3.0 release
+* Improved kD-tree based point cloud encoding
+  * Now applicable to point clouds with any number of attributes
+  * Support for all integer attribute types and quantized floating point types
+* Improved mesh compression up to 10% (on average ~2%)
+  * For meshes, the 1.3.0 bitstream is fully compatible with 1.2.x decoders
+* Improved Javascript API
+  * Added support for all signed and unsigned integer types
+  * Added support for point clouds to our Javascript encoder API
+* Added support for integer properties to the PLY decoder
+* Bug fixes
+
+### Previous releases
+https://github.com/google/draco/releases
+
+Description
+===========
+
+Draco is a library for compressing and decompressing 3D geometric [meshes] and
+[point clouds]. It is intended to improve the storage and transmission of 3D
+graphics.
+
+Draco was designed and built for compression efficiency and speed. The code
+supports compressing points, connectivity information, texture coordinates,
+color information, normals, and any other generic attributes associated with
+geometry. With Draco, applications using 3D graphics can be significantly
+smaller without compromising visual fidelity. For users, this means apps can
+now be downloaded faster, 3D graphics in the browser can load quicker, and VR
+and AR scenes can now be transmitted with a fraction of the bandwidth and
+rendered quickly.
+
+Draco is released as C++ source code that can be used to compress 3D graphics
+as well as C++ and Javascript decoders for the encoded data.
+
+
+_**Contents**_
+
+  * [Building](#building)
+  * [Usage](#usage)
+    * [Unity](#unity)
+    * [WASM and JavaScript Decoders](#WASM-and-JavaScript-Decoders)
+    * [Command Line Applications](#command-line-applications)
+    * [Encoding Tool](#encoding-tool)
+    * [Encoding Point Clouds](#encoding-point-clouds)
+    * [Decoding Tool](#decoding-tool)
+    * [C++ Decoder API](#c-decoder-api)
+    * [Javascript Encoder API](#javascript-encoder-api)
+    * [Javascript Decoder API](#javascript-decoder-api)
+    * [Javascript Decoder Performance](#javascript-decoder-performance)
+    * [Metadata API](#metadata-api)
+    * [NPM Package](#npm-package)
+    * [three.js Renderer Example](#threejs-renderer-example)
+  * [Support](#support)
+  * [License](#license)
+  * [References](#references)
+
+
+Building
+========
+See [BUILDING](BUILDING.md) for building instructions.
+
+
+Usage
+======
+
+Unity
+-----
+For the best information about using Unity with Draco please visit https://github.com/atteneder/DracoUnity
+
+For a simple example of using Unity with Draco see [README](unity/README.md) in the unity folder.
+
+WASM and JavaScript Decoders
+----------------------------
+
+It is recommended to always pull your Draco WASM and JavaScript decoders from:
+
+~~~~~ bash
+https://www.gstatic.com/draco/v1/decoders/
+~~~~~
+
+Users will benefit from having the Draco decoder in cache as more sites start using the static URL.
+
+Command Line Applications
+------------------------
+
+The default target created from the build files will be the `draco_encoder`
+and `draco_decoder` command line applications. For both applications, if you
+run them without any arguments or `-h`, the applications will output usage and
+options.
+
+Encoding Tool
+-------------
+
+`draco_encoder` will read OBJ or PLY files as input, and output Draco-encoded
+files. We have included Stanford's [Bunny] mesh for testing. The basic command
+line looks like this:
+
+~~~~~ bash
+./draco_encoder -i testdata/bun_zipper.ply -o out.drc
+~~~~~
+
+A value of `0` for the quantization parameter will not perform any quantization
+on the specified attribute. Any value other than `0` will quantize the input
+values for the specified attribute to that number of bits. For example:
+
+~~~~~ bash
+./draco_encoder -i testdata/bun_zipper.ply -o out.drc -qp 14
+~~~~~
+
+will quantize the positions to 14 bits (default is 11 for the position
+coordinates).
+
+In general, the more you quantize your attributes the better compression rate
+you will get. It is up to your project to decide how much deviation it will
+tolerate. In general, most projects can set quantization values of about `11`
+without any noticeable difference in quality.
+
+The compression level (`-cl`) parameter turns on/off different compression
+features.
+
+~~~~~ bash
+./draco_encoder -i testdata/bun_zipper.ply -o out.drc -cl 8
+~~~~~
+
+In general, the highest setting, `10`, will have the most compression but
+worst decompression speed. `0` will have the least compression, but best
+decompression speed. The default setting is `7`.
+
+Encoding Point Clouds
+---------------------
+
+You can encode point cloud data with `draco_encoder` by specifying the
+`-point_cloud` parameter. If you specify the `-point_cloud` parameter with a
+mesh input file, `draco_encoder` will ignore the connectivity data and encode
+the positions from the mesh file.
+
+~~~~~ bash
+./draco_encoder -point_cloud -i testdata/bun_zipper.ply -o out.drc
+~~~~~
+
+This command line will encode the mesh input as a point cloud, even though the
+input might not produce compression that is representative of other point
+clouds. Specifically, one can expect much better compression rates for larger
+and denser point clouds.
+
+Decoding Tool
+-------------
+
+`draco_decoder` will read Draco files as input, and output OBJ or PLY files.
+The basic command line looks like this:
+
+~~~~~ bash
+./draco_decoder -i in.drc -o out.obj
+~~~~~
+
+C++ Decoder API
+-------------
+
+If you'd like to add decoding to your applications you will need to include
+the `draco_dec` library. In order to use the Draco decoder you need to
+initialize a `DecoderBuffer` with the compressed data. Then call
+`DecodeMeshFromBuffer()` to return a decoded mesh object or call
+`DecodePointCloudFromBuffer()` to return a decoded `PointCloud` object. For
+example:
+
+~~~~~ cpp
+draco::DecoderBuffer buffer;
+buffer.Init(data.data(), data.size());
+
+const draco::EncodedGeometryType geom_type =
+    draco::GetEncodedGeometryType(&buffer);
+if (geom_type == draco::TRIANGULAR_MESH) {
+  unique_ptr<draco::Mesh> mesh = draco::DecodeMeshFromBuffer(&buffer);
+} else if (geom_type == draco::POINT_CLOUD) {
+  unique_ptr<draco::PointCloud> pc = draco::DecodePointCloudFromBuffer(&buffer);
+}
+~~~~~
+
+Please see [src/draco/mesh/mesh.h](src/draco/mesh/mesh.h) for the full `Mesh` class interface and
+[src/draco/point_cloud/point_cloud.h](src/draco/point_cloud/point_cloud.h) for the full `PointCloud` class interface.
+
+
+Javascript Encoder API
+----------------------
+The Javascript encoder is located in `javascript/draco_encoder.js`. The encoder
+API can be used to compress mesh and point cloud. In order to use the encoder,
+you need to first create an instance of `DracoEncoderModule`. Then use this
+instance to create `MeshBuilder` and `Encoder` objects. `MeshBuilder` is used
+to construct a mesh from geometry data that could be later compressed by
+`Encoder`. First create a mesh object using `new encoderModule.Mesh()` . Then,
+use `AddFacesToMesh()` to add indices to the mesh and use
+`AddFloatAttributeToMesh()` to add attribute data to the mesh, e.g. position,
+normal, color and texture coordinates. After a mesh is constructed, you could
+then use `EncodeMeshToDracoBuffer()` to compress the mesh. For example:
+
+~~~~~ js
+const mesh = {
+  indices : new Uint32Array(indices),
+  vertices : new Float32Array(vertices),
+  normals : new Float32Array(normals)
+};
+
+const encoderModule = DracoEncoderModule();
+const encoder = new encoderModule.Encoder();
+const meshBuilder = new encoderModule.MeshBuilder();
+const dracoMesh = new encoderModule.Mesh();
+
+const numFaces = mesh.indices.length / 3;
+const numPoints = mesh.vertices.length;
+meshBuilder.AddFacesToMesh(dracoMesh, numFaces, mesh.indices);
+
+meshBuilder.AddFloatAttributeToMesh(dracoMesh, encoderModule.POSITION,
+  numPoints, 3, mesh.vertices);
+if (mesh.hasOwnProperty('normals')) {
+  meshBuilder.AddFloatAttributeToMesh(
+    dracoMesh, encoderModule.NORMAL, numPoints, 3, mesh.normals);
+}
+if (mesh.hasOwnProperty('colors')) {
+  meshBuilder.AddFloatAttributeToMesh(
+    dracoMesh, encoderModule.COLOR, numPoints, 3, mesh.colors);
+}
+if (mesh.hasOwnProperty('texcoords')) {
+  meshBuilder.AddFloatAttributeToMesh(
+    dracoMesh, encoderModule.TEX_COORD, numPoints, 3, mesh.texcoords);
+}
+
+if (method === "edgebreaker") {
+  encoder.SetEncodingMethod(encoderModule.MESH_EDGEBREAKER_ENCODING);
+} else if (method === "sequential") {
+  encoder.SetEncodingMethod(encoderModule.MESH_SEQUENTIAL_ENCODING);
+}
+
+const encodedData = new encoderModule.DracoInt8Array();
+// Use default encoding setting.
+const encodedLen = encoder.EncodeMeshToDracoBuffer(dracoMesh,
+                                                   encodedData);
+encoderModule.destroy(dracoMesh);
+encoderModule.destroy(encoder);
+encoderModule.destroy(meshBuilder);
+
+~~~~~
+Please see [src/draco/javascript/emscripten/draco_web_encoder.idl](src/draco/javascript/emscripten/draco_web_encoder.idl) for the full API.
+
+Javascript Decoder API
+----------------------
+
+The Javascript decoder is located in [javascript/draco_decoder.js](javascript/draco_decoder.js). The
+Javascript decoder can decode mesh and point cloud. In order to use the
+decoder, you must first create an instance of `DracoDecoderModule`. The
+instance is then used to create `DecoderBuffer` and `Decoder` objects. Set
+the encoded data in the `DecoderBuffer`. Then call `GetEncodedGeometryType()`
+to identify the type of geometry, e.g. mesh or point cloud. Then call either
+`DecodeBufferToMesh()` or `DecodeBufferToPointCloud()`, which will return
+a Mesh object or a point cloud. For example:
+
+~~~~~ js
+// Create the Draco decoder.
+const decoderModule = DracoDecoderModule();
+const buffer = new decoderModule.DecoderBuffer();
+buffer.Init(byteArray, byteArray.length);
+
+// Create a buffer to hold the encoded data.
+const decoder = new decoderModule.Decoder();
+const geometryType = decoder.GetEncodedGeometryType(buffer);
+
+// Decode the encoded geometry.
+let outputGeometry;
+let status;
+if (geometryType == decoderModule.TRIANGULAR_MESH) {
+  outputGeometry = new decoderModule.Mesh();
+  status = decoder.DecodeBufferToMesh(buffer, outputGeometry);
+} else {
+  outputGeometry = new decoderModule.PointCloud();
+  status = decoder.DecodeBufferToPointCloud(buffer, outputGeometry);
+}
+
+// You must explicitly delete objects created from the DracoDecoderModule
+// or Decoder.
+decoderModule.destroy(outputGeometry);
+decoderModule.destroy(decoder);
+decoderModule.destroy(buffer);
+~~~~~
+
+Please see [src/draco/javascript/emscripten/draco_web_decoder.idl](src/draco/javascript/emscripten/draco_web_decoder.idl) for the full API.
+
+Javascript Decoder Performance
+------------------------------
+
+The Javascript decoder is built with dynamic memory. This will let the decoder
+work with all of the compressed data. But this option is not the fastest.
+Pre-allocating the memory sees about a 2x decoder speed improvement. If you
+know all of your project's memory requirements, you can turn on static memory
+by changing `CMakeLists.txt` accordingly.
+
+Metadata API
+------------
+Starting from v1.0, Draco provides metadata functionality for encoding data
+other than geometry. It could be used to encode any custom data along with the
+geometry. For example, we can enable metadata functionality to encode the name
+of attributes, name of sub-objects and customized information.
+For one mesh and point cloud, it can have one top-level geometry metadata class.
+The top-level metadata then can have hierarchical metadata. Other than that,
+the top-level metadata can have metadata for each attribute which is called
+attribute metadata. The attribute metadata should be initialized with the
+correspondent attribute id within the mesh. The metadata API is provided both
+in C++ and Javascript.
+For example, to add metadata in C++:
+
+~~~~~ cpp
+draco::PointCloud pc;
+// Add metadata for the geometry.
+std::unique_ptr<draco::GeometryMetadata> metadata =
+  std::unique_ptr<draco::GeometryMetadata>(new draco::GeometryMetadata());
+metadata->AddEntryString("description", "This is an example.");
+pc.AddMetadata(std::move(metadata));
+
+// Add metadata for attributes.
+draco::GeometryAttribute pos_att;
+pos_att.Init(draco::GeometryAttribute::POSITION, nullptr, 3,
+             draco::DT_FLOAT32, false, 12, 0);
+const uint32_t pos_att_id = pc.AddAttribute(pos_att, false, 0);
+
+std::unique_ptr<draco::AttributeMetadata> pos_metadata =
+    std::unique_ptr<draco::AttributeMetadata>(
+        new draco::AttributeMetadata(pos_att_id));
+pos_metadata->AddEntryString("name", "position");
+
+// Directly add attribute metadata to geometry.
+// You can do this without explicitly add |GeometryMetadata| to mesh.
+pc.AddAttributeMetadata(pos_att_id, std::move(pos_metadata));
+~~~~~
+
+To read metadata from a geometry in C++:
+
+~~~~~ cpp
+// Get metadata for the geometry.
+const draco::GeometryMetadata *pc_metadata = pc.GetMetadata();
+
+// Request metadata for a specific attribute.
+const draco::AttributeMetadata *requested_pos_metadata =
+  pc.GetAttributeMetadataByStringEntry("name", "position");
+~~~~~
+
+Please see [src/draco/metadata](src/draco/metadata) and [src/draco/point_cloud](src/draco/point_cloud) for the full API.
+
+NPM Package
+-----------
+Draco NPM NodeJS package is located in [javascript/npm/draco3d](javascript/npm/draco3d). Please see the
+doc in the folder for detailed usage.
+
+three.js Renderer Example
+-------------------------
+
+Here's an [example] of a geometric compressed with Draco loaded via a
+Javascript decoder using the `three.js` renderer.
+
+Please see the [javascript/example/README.md](javascript/example/README.md) file for more information.
+
+Support
+=======
+
+For questions/comments please email <draco-3d-discuss@googlegroups.com>
+
+If you have found an error in this library, please file an issue at
+<https://github.com/google/draco/issues>
+
+Patches are encouraged, and may be submitted by forking this project and
+submitting a pull request through GitHub. See [CONTRIBUTING] for more detail.
+
+License
+=======
+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.
+
+References
+==========
+[example]:https://storage.googleapis.com/demos.webmproject.org/draco/draco_loader_throw.html
+[meshes]: https://en.wikipedia.org/wiki/Polygon_mesh
+[point clouds]: https://en.wikipedia.org/wiki/Point_cloud
+[Bunny]: https://graphics.stanford.edu/data/3Dscanrep/
+[CONTRIBUTING]: https://raw.githubusercontent.com/google/draco/master/CONTRIBUTING.md
+
+Bunny model from Stanford's graphic department <https://graphics.stanford.edu/data/3Dscanrep/>