Sketch3D Toolkit is a lightweight sketch-based shape retrieval framework designed to enable people to make use of hand-drawn sketches as queries to retrieve large scale 3D model datasets on lightweight devices without powerful GPGPUs, such as laptops, tablets and mobiles. This project is released under the MIT license, and all code is public domain software. If you use the Sketch3D Toolbox, we appreciate it if you cite an appropriate subset of the following papers:

@article{ZhaoTVC15views,
  author    = {Long Zhao and Shuang Liang and Jinyuan Jia and Yichen Wei},
  title     = {Learning best views of 3D shapes from sketch contour},
  journal   = {The Visual Computer},
  year      = {2015},
  volume    = {31},
  number    = {6-8},
  pages     = {765--774}
}

@inproceedings{LiangPCM14hashing,
  author    = {Shuang Liang and Long Zhao and Yichen Wei and Jinyuan Jia},
  title     = {Sketch-Based Retrieval Using Content-Aware Hashing},
  booktitle = {Proceedings of the 15th Annual Pacific-Rim Conference on Multimedia (PCM)},
  year      = {2014},
  pages     = {133--142}
}

• Quick start
• Project dependency
• What's included
• Working pipeline
• Related projects

This toolkit contains the C++ implementation of the core sketch-based shape retrieval algorithm, MATLAB retrieval interfaces and a retrieval performance evaluation tool suite built upon the evaluation code provided by SHREC'13 and SHREC'14. CMake is utilized to build and package the whole project.

Note that the websites of SHREC'13 & 14 are no longer available, please download the data from Google Drive.

All code has been tested on Windows 10 (64-bit) with CMake v3.5.1, OpenCV v2.4.12 (the pre-compiled 64-bit binaries for Windows are included in msvc folder), Visual Studio 2015 and MATLAB 2015b. Other platforms with compilers supporting C++11 standard are excepted to work but not guaranteed. On Windows platforms, please make sure that cmake.exe and MsBuild.exe (MSBuild is the build system for Visual Studio) are included in the system PATH environment variable before compiling.

Run the following command to download and compile the code. Note that the CMake parameter CMAKE_GENERATOR_PLATFORM=x64 is specified to compile all binaries and libraries in 64-bit mode. You are free to compile the code in 32-bit mode; however, since the hashing functions employed are optimized in 64-bit mode, 32-bit binaries and libraries may result in performance loss.

> git clone https://github.com/garyzhao/Sketch3DToolkit.git
> cd Sketch3DToolkit
> mkdir build
> cd build
> cmake -DCMAKE_GENERATOR_PLATFORM=x64 ..
> MsBuild Sketch3DToolkit.sln /p:Configuration=Release

Or you can also launch Visual Studio to open the solution configuration file Sketch3DToolkit.sln generated by CMake and build the ALL_BUILD subproject with the Release configuration to compile the whole solution. You can find the compiled binaries and runtime/static libraries in build/bin folder and MEX interfaces in build/mex folder.

Go to matlab folder and run install.m under matlab folder in MATLAB to install compiled MEX files, as well as essential OpenGL and OpenCV DLL runtime libraries, into matlab/util folder. Notice: please make sure that the MATLAB installation has been properly detected by CMake, otherwise the MEX files won't be compiled and install.m will be failed.

The following OpenGL and 3D mesh libraries are used in this project for reading, processing and rendering different 3D models. All these dependencies are included in this repository under the lib folder.

• FreeGLUT: a free-software/open-source alternative to the OpenGL Utility Toolkit (GLUT) library
• GLEW: a cross-platform open-source C/C++ extension loading library
• GLUI: a GLUT-based C++ user interface library which provides different controls to OpenGL applications
• Trimesh2: a C++ library and set of utilities for input, output, and basic manipulation of 3D triangle meshes

Within the download you'll find the following directories and files, logically grouping C++ header files and definition files. You'll see main folders organized like this:

• lib: additional OpenGL and 3D mesh library dependencies
• matlab: MATLAB code for sketch/model retrieving and performance evaluating
• mex: MEX code of MATLAB interfaces
• module: core C++ modules for sketch/model feature computing and indexing
• module/hashing: C++ code for MinHash feature hashing
• module/imgproc: C++ code for sketch image processing
• module/meshutil: C++ code for processing and showing 3D models
• module/retrieval: C++ code for sketch-based shape/sketch retrieval
• msvc: Visual Studio configuration files and pre-compiled OpenCV binaries (x64 version) for Windows
• src: C++ example code showing how to use 3D model retrieval/display interfaces in this project

For example, evaluating the performance of our sketch-based 3D model retrieval algorithm on the SHREC'13 dataset can be done as follows:

1. Set DATASET_DIR variable to 'SHREC13' in setupvars.m
2. Download the complete 3D target model dataset of SHREC'13 and put them into matlab\SHREC13\Models
3. Download the training and testing sketches dataset of SHREC'13 and put them into matlab\SHREC13\Sketches

Organize these files so that directory structure looks like this:

SHREC13
|-- Models
    |-- m0.off
    |-- m1.off
    |-- ...
|-- Sketches
    |-- airplane
        |-- test
            |-- 2.png
            |-- ...
        |-- train
            |-- 1.png
            |-- ...
    |-- ant
    |-- ...

3. Run sbsr_select_model_views.m to generate candidate views for all 3D models into matlab\SHREC13\Views
4. Run sbsr_retrieve_model.m to retrieve 3D models for all query sketches, and results are saved into matlab\SHREC13\RetrievalLists
5. Run eval_rank_lists.m to evaluate the retrieval performance
6. Run eval_draw_curves.m to show Precision-Recall Curves (PR Curves) for evaluated methods

Note that we use a MEX file to speed up the evaluation process, which is 100x faster than the original evaluation code provided by SHREC'13.

• SMHasher. A test suite offering various hash functions for feature hashing used in this project.
• SketchBasedShapeRetrieval. A C++/Python implementation of the shape matching pipeline in the paper "Sketch-Based Shape Retrieval", which is adapted for mesh view selection in batch mode in this project.
• Jeroen Baert's Real-time Suggestive Contour Rendering. An efficient implementation of different contour rendering methods. The line rendering algorithm in this project is built upon it.