Building OpenSCAD with remeshing to fix fast-csg's performance on very large models

README.md

fast-csg is still a work in progress.

For large models it works best with CGAL/cgal#5461 in CGAL and used in OpenSCAD by openscad/openscad#4107.

If you want a sneak peek of the new world, enable fast-csg-remesh in the following build:

( git clone https://github.com/sloriot/cgal \
    -b PMP-decimation --depth=1 \
    cgal-sloriot-PMP-decimation && \
  cd cgal-sloriot-PMP-decimation && \
  mkdir -p build && \
  cd build && \
  cmake .. -DCMAKE_INSTALL_PREFIX=$PWD && \
  make install )

( git clone https://github.com/ochafik/openscad\
    -b remesh-support --depth=1 \
    openscad-ochafik-remesh-support && \
  cd openscad-ochafik-remesh-support && \
  git submodule update --init && \
  mkdir -p build && \
  cd build && \
  cmake .. \
    -DCMAKE_BUILD_TYPE=Release \
    -DEXPERIMENTAL=1 \
    -DSORT_BUILD=1 \
    -DENABLE_CGAL_REMESHING=1 \
    -DCGAL_DIR=$PWD/../../cgal-sloriot-PMP-decimation/build && \
  make -j12 )
  
cd openscad-ochafik-remesh-support/build
# On Mac: 
#   alias openscad=$PWD/OpenSCAD.app/Contents/MacOS/OpenSCAD
alias openscad=$PWD/openscad

openscad \
  --enable=fast-csg \
  --enable=fast-csg-trust-corefinement \
  --enable=fast-csg-remesh \
  -o $PWD/out.stl \
  <some input file>

(if you haven't done so already, you'll need to install build dependencies as explained here)