Bug 194727 Pyramid chart with 2d+ dimension should like a pyramid
Pyramid chart in 2d+ dimension should like a pyramid, rather than a triangle with depth effect. In addition, pyramid in 2d+ should like itself in 3d as well. Take a look at attached screenshot to compare the charts.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/render/BaseRenderer.java
{
	/**
	 * This key is to reference the location array of last stacked series.
	 */
	protected final static String STACKED_SERIES_LOCATION_KEY = "stacked_series_location_key"; 
	/**
	 * This key is to reference the fixed location array of last stacked series.
	 */
	protected final static String FIXED_STACKED_SERIES_LOCATION_KEY = "fixed_stacked_series_location_key"; 
	/**
	 * This key is to reference the fixed index value of last stacked series.
	 */
	protected final static String FIXED_STACKED_SERIES_INDEX_KEY = "fixed_stacked_series_index_key"; 
	
	
	protected final static String STACKED_SERIES_SIZE_KEY = "stacked_series_size_key"; 
	protected static final String TIMER = "T"; 
	protected ISeriesRenderingHints srh;
	protected IDisplayServer xs;
	protected IDeviceRenderer ir;
	protected DeferredCache dc;