code: public FloatBuffer getColorBuffer(int colorset) {
          if (m_colorsets[colorset] == null) {
              return null;
          }
          
          return m_colorsets[colorset].asFloatBuffer();
      }
docs: Returns a buffer containing vertex colors for a color set.<p>
  
  A vertex color consists of 4 floats (red, green, blue and alpha), the
  buffer will therefore contain <code>4 * getNumVertices()</code> floats
  
  @param colorset the color set
  
  @return a native-order direct buffer, or null if no data is available