Method readMesh

src/main/java/trace/graphics/PlyReader.java:658–763

Reads a mesh from this file. @return the mesh contained in the file @throws IOException if an I/O error occurs @throws InvalidPlyFormatException if the format of the file is incorrect @throws IllegalStateException if the file doesn't contain any faces (#hasFaces() returns false)

()

    /**
     * Reads a mesh from this file.
     * @return the mesh contained in the file
     * @throws IOException if an I/O error occurs
     * @throws InvalidPlyFormatException if the format of the file is incorrect
     * @throws IllegalStateException if the file doesn't contain any faces ({@link #hasFaces()} returns {@code false})
     */
    public Pair<List<Vertex>, List<int[]>> readMesh() throws IOException, InvalidPlyFormatException {
        if (!hasFaces) throw new IllegalStateException("No faces");

        List<Vertex> vertices=new ArrayList<>(vertexElement.count);
        List<int[]> triangles=new ArrayList<>(faceElement.count);

        try (Input input=getInput()) {

            for (Element currentElement: elements) {
                if (currentElement==vertexElement) {
					/* Parse vertices */
                    for (int elemIndex=0; elemIndex<currentElement.count; elemIndex++) {
                        Vertex v=new Vertex();
                        vertices.add(v);
                        for (int propIndex=0; propIndex<currentElement.properties.size(); propIndex++) {
                            Property prop=currentElement.properties.get(propIndex);
                            if (propIndex==vertexXPropIndex) {
                                v.x(input.read(((ScalarProperty)prop).type).doubleValue());
                            } else if (propIndex==vertexYPropIndex) {
                                v.y(input.read(((ScalarProperty)prop).type).doubleValue());
                            } else if (propIndex==vertexZPropIndex) {
                                v.z(input.read(((ScalarProperty)prop).type).doubleValue());
                            } else {
                                if (prop instanceof ListProperty) {
                                    List<Float> d = new ArrayList<>();
                                    int count=input.read(((ListProperty)prop).countType).intValue();
                                    if (count<0) throw new InvalidPlyFormatException("List with negative number of elements");
                                    for (int i=0; i<count; i++) {
                                        d.add(input.read(((ListProperty)prop).elemType).floatValue());
                                    }
                                    v.attributes.put(prop.name, d);
                                } else {
                                    float d = input.read(((ScalarProperty)prop).type).floatValue();
                                    v.attributes.put(prop.name, Collections.singletonList(d));
                                }
                            }
                        }
                    }
                } else if (currentElement==faceElement) {
					/* Parse faces */
                    for (int elemIndex=0; elemIndex<currentElement.count; elemIndex++) {
                        for (int propIndex=0; propIndex<currentElement.properties.size(); propIndex++) {
                            Property prop=currentElement.properties.get(propIndex);
                            if (propIndex==vertexIndicesPropIndex) {
                                ListProperty lp=(ListProperty)prop;
                                int count=input.read(lp.countType).intValue();
                                if (count<3) throw new InvalidPlyFormatException("Face with "+count+" vertices");
                                switch (count) {
                                    case 3:
                                        Number v1,v2,v3,v4;
                                        v1=input.read(lp.elemType);
                                        if (v1.longValue()<0 || v1.longValue()>=vertexElement.count) throw new InvalidPlyFormatException("Invalid vertex index: "+v1.longValue());