# VolumeIO Input/Output for the structures describing 3D volumes, such as the Geometry class, and voxels in 3D arrays such as the Matrix class. Geometries can be read from STL format, both binary and ascii format. ## Interface
      template <typename T>
      bool writeSTL(const Geometry<T> &geometry,
      		const std::string fileName,
      		const bool binary = true)
| Write a Geometry to an STL-file in binary format (default), or, if binary is false in ascii format.
    template <typename T>
      bool readSTL(Geometry<T> &geometry,
    	     const std::string fileName);
| Read a Geometry from an STL-file.
      bool writeVoxels(const Array<T, N, Aux> &voxels,
    		const std::string fileName,
    		const bool compress = true);
| Identical to writeArray in ArrayIO, except that compression is enabled by default.
      bool readVoxels(Array<T, N, Aux> &voxels,
    		const std::string fileName);
| Identical to readArray in ArrayIO.
## Example ### Facets to Voxels Read a 3D Geometry in facet representation from an STL file, transform it to voxels with the Voxelizer, then write the 3D array of voxels to disk in compressed format:
    #include <cvmlcpp/base/Matrix>
    #include <cvmlcpp/volume/Geometry>
    #include <cvmlcpp/volume/VolumeIO>
    #include <cvmlcpp/volume/Voxelizer>

    using namespace cvmlcpp;

    Geometry<float> geometry;
    readSTL(geometry, "cube.stl");

    Matrix<char, 3> voxels;

    // Use greater precision during calculations
    Voxelizer<double>::voxelize(geometry, voxels, voxelSize, 1);
    writeArray(voxels, "voxels.dat");
### Voxels to Facets Read voxels from a file, transform it to facet representation with the SurfaceExtractor.
    #include <cvmlcpp/base/Matrix>
    #include <cvmlcpp/volume/Geometry>
    #include <cvmlcpp/volume/SurfaceExtractor>
    #include <cvmlcpp/volume/VolumeIO>

    using namespace cvmlcpp;

    Matrix<char, 3> voxels;
    readArray(voxels, "voxels.dat");
    Geometry<float> geometry;

    // Use greater precision during calculations
    SurfaceExtractor<double>::extract(voxels, geometry);