code: function( array, offset ){
      var gl = this.gl;
      gl.bindBuffer(    TGT, this.buffer );
      gl.bufferSubData( TGT, offset, array );
      gl.bindBuffer(    TGT, null );
    }
docs: Set a part of the buffer with the given data, starting a offset (in bytes)
  @param {typedArray} array the data to send to buffer
  @param {uint} offset the offset in byte where the data will be written