function PMXHeader(buffer){
    this.signature = buffer.readByte(4);
    this.version = buffer.readFloat();
    this.globalsCount = buffer.readByte(1)[0];
    this.globals = buffer.readByte(this.globalsCount);
    this.nameLocal = new Text();
    this.nameLocal.readFromFile(buffer);
    this.nameUniversal = new Text();
    this.nameUniversal.readFromFile(buffer);
    this.commentsLocal = new Text();
    this.commentsLocal.readFromFile(buffer);
    this.commentsUniversal = new Text();
    this.commentsUniversal.readFromFile(buffer);
}

function PMXVertex(buffer, addVec4, boneIndex){
    this.position = new Vec3();
    this.position.readFromFile(buffer);
    this.normal = new Vec3();
    this.normal.readFromFile(buffer);
    this.uv = new Vec2();
    this.uv.readFromFile(buffer);
    
	...
}

function PMXFile(buffer){
    this.header = new PMXHeader(buffer);

    this.vertexCount = buffer.readUint();
    this.vertices = [];
    this.vertexData = new Float32Array(this.vertexCount*3);
    this.uvData = new Float32Array(this.vertexCount*2);
    for(var i = 0; i < this.vertexCount; i++){
        var vertex = new PMXVertex(buffer,this.header.globals[1], this.header.globals[5]);
        this.vertices.push(vertex);
        var vertexData = vertex.position.getData();
        this.vertexData[3*i] = vertexData[0];
        this.vertexData[3*i+1] = vertexData[1];
        this.vertexData[3*i+2] = vertexData[2];
        this.uvData[2*i] = vertex.uv.x;
        this.uvData[2*i+1] = vertex.uv.y;
    }
}