Painting-to-3D Model Alignment source code

Here you will find a Matlab implementation of the algorithm described in the following paper:

Mathieu Aubry, Bryan C. Russell and Josef Sivic Painting-to-3D Model Alignment Via Discriminative Visual Elements ACM Transactions on Graphics, 2014 (presented at SIGGRAPH 2014) PDF | bibtex | project webpage

DOWNLOADING THE CODE:

You can download a zip file of the source code directly.

Alternatively, you can clone it from GitHub as follows:

$ git clone https://github.com/mathieuaubry/paintingTo3D.git

DOWNLOADING THE DATA

If you want to use one of our models, you have to download the rendered views and corresponding data for the 3D model you want to use:

• CAD model of San Marco Basilica (614MB). The original 3D model is available here.
• CAD model of Notre Dame (2GB). The original 3D model is available here.
• CAD model of Trevi fountain (792MB). The original 3D model is available here.

Additionaly, you can download our pre-computed discriminative elements for:

• CAD model of San Marco Basilica (104MB).
• CAD model of Notre Dame (107MB).
• CAD model of Trevi fountain (131MB).

The paintings we used to test our method are available here (40MB)

To test the renderer, you can also download a test camera recovered by our algorithm with the associated painting and the 3D model converted for use with our renderer (see READING SKETCHUP MODELS section).

RUNNING THE CODE:

1. Start by compiling the code. At the Matlab command prompt run:

   >> compile;

2. Download or generate the rendered views of the model you want to work with.

3. (Optional) demoSelectDEs.m is a script that computes the discriminative elements from a set of rendered views of a 3D model and their associated Cameras and 3D points. It must be run before doing detection. Alternatively, you can download our pre-computed discriminative elements (see DOWNLOAD THE DATA section).

4. demoAlignPainting.m is a script that uses the discriminative elements to recover the camera parameters corresponding to the viewpoint of the painting. To render the recovered viewpoint, you must first compile the renderer code (see next section).

COMPILING THE RENDERER:

To view the final results you will need to render from the 3D model. The following are instructions for compiling the renderer.

1. Download trimesh2 and uncompress the tarball.

2. Define the following variables:

   • $PAINTING_CODE - location of "paintingTo3D" code

   • $TRIMESH2 - location of trimesh2 folder

   • $MEX - command-line location of mex compiler; get the location by running in Matlab:

     >> fullfile(matlabroot,'bin','mex')

   • $ARCH - set this to one of {Linux | Linux64 | Darwin | Darwin64} depending on which architecture you are compiling (e.g. "Darwin64" is 64-bit Mac)

3. Run the following in a Bash shell:

   $ cd $PAINTING_CODE/renderer
   $ make TRIMESHDIR=$TRIMESH2
   $ $MEX mexReadPly.cpp -I$TRIMESH2/include -L$TRIMESH2/lib.$ARCH -ltrimesh -lgomp
   $ $MEX mexWritePly.cpp -I$TRIMESH2/include -L$TRIMESH2/lib.$ARCH -ltrimesh -lgomp

4. To test the renderer, download this test camera, the associated 3D model converted for use with our renderer (see READING SKETCHUP MODELS section) and run the script inside demoRendering.m.

Common problems:

• If you are compiling on Mac and get a "library not found for -lgomp" error, then you are using a CLANG compiler (recent versions of Mac use this), which does not contain openmp. To resolve this you can install an older gcc compiler via homebrew. Replace "Step 3" above with the following:

  $ brew install homebrew/versions/gcc49
  $ cd $PAINTING_CODE/renderer
  $ make TRIMESHDIR=$TRIMESH2 CC=gcc-4.9 CXX=g++-4.9
  $ $MEX mexReadPly.cpp -I$TRIMESH2/include -L$TRIMESH2/lib.$ARCH -ltrimesh -lgomp CXX=g++-4.9 CXXFLAGS="-fno-common -arch x86_64 -fexceptions"
  $ $MEX mexWritePly.cpp -I$TRIMESH2/include -L$TRIMESH2/lib.$ARCH -ltrimesh -lgomp CXX=g++-4.9 CXXFLAGS="-fno-common -arch x86_64 -fexceptions"

• If you are compiling on Linux and get an error saying to recompile with -fPIC, then you need to recompile trimesh2. Run inside a Bash shell:

  $ cd $TRIMESH2
  $ make clean
  $ make ARCHOPTS=-fPIC

  Then re-run "Step 3" above.

• If you're running on Linux and the code hangs, first make sure you can display X windows (i.e. if you're running over SSH make sure you have X forwarding enabled; you can test this by running "xterm" in the bash shell). If you can display X windows but the code hangs, then run the following in the Bash shell:

  $ export LIBGL_ALWAYS_INDIRECT=1

  Then try to run demoRendering.m again.

READING SKETCHUP MODELS:

To interact with Sketchup models, we provide a function to convert to our renderer. Look at the instructions inside BuildTexturedModel.m for more details.

ACKNOWLEDGMENTS:

The functions features.cc and bboverlap.m have been adapted from Ross Girshick's and Pedro Felzenswalb's implementation available at https://github.com/rbgirshick/voc-dpm