<dependency>
        <groupId>com.github.danny02</groupId>
        <artifactId>JOpenCTM</artifactId>
        <version>1.5.2</version>
    </dependency>

    float[] vertices = {...};
    float[] normals = {...} // or 'null' of not existing;
    int[] indices = {...};
    
    //provide an empty array if the mesh has no texture coordinates, same goes for the custom attributes
    AttributeData[] texcoordinates = new AttributeData[0];
    //each custom attribute defines an own precision value for the MG2 encoder
    AttributeData[] attributes = {new AttributeData("attribute name", "material name", STANDARD_PRECISION, new float[]{...})};
    
    Mesh mesh = new Mesh(vertices, normals, indices, texcoordinates, attributes);
    
    //you should always check the integrity of the model before encoding
    //report errors with checked exception
    mesh.checkIntegrity();
    //return a list of errors
    mesh.validate();

    InputStream in = new FileInputStream(...);
    CtmFileReader reader = new CtmFileReader(in);
    
    //read a CTM file into memory without checking any mesh properties
    Mesh mesh = reader.decodeWithoutValidation();
    //read a CTM file while checking some propeties, i.e. indicies point to valid verticies, count of normals is equal to vertex count
    Mesh validMesh = reader.decode();

    OutputStream out = new FileOutputStream(...);
    MeshEncoder rawEncoder = new RawEncoder();
    MeshEncoder mg1Encoder = new MG1Encoder();
    //MG2 is an lossy encoding. The precision values define the maximum error of the vertex attributes
    MeshEncoder mg2Encoder = new MG2Encoder(VERTEX_PRECISION, NORMAL_PRECISION);
    
    CtmFileWriter writer = new CtmFileWriter(out, rawEncoder);
    //the compression factor is only used by the two MG encoders and ignored by the raw encoder
    CtmFileWriter compressedWriter = new CtmFileWriter(out, mg2Encoder, lzmaCompressionFactor /*1-9, 5 gives already nearly the best compression*/);
    
    Mesh teapot = ...;
    writer.encode(teapot, "Written by my awesome App!");