code: public float[] getFloatArray(String attributeName)
      {
          float[] array = NativeVertexBuffer.getFloatArray(getNative(), attributeName);
          if (array == null)
          {
              throw new IllegalArgumentException("Attribute name " + attributeName + " cannot be accessed");
          }
          return array;
      }
docs: Retrieves a vertex attribute as a float array.
  The attribute name must be one of the
  attributes named in the descriptor passed to the constructor.
  @param attributeName name of the attribute to update
  @throws IllegalArgumentException if attribute name not in descriptor vertex attribute is not <i>float</i>
  @see #setFloatVec(String, FloatBuffer)
  @see #getFloatArray(String)