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
* 
	 * @throws ChartException
	 */
	protected void renderBlock( IPrimitiveRenderer ipr, Block b, Object oSource )
			throws ChartException
	{
		final double dScale = getDeviceScale( );
		final RectangleRenderEvent rre = (RectangleRenderEvent) ( (EventObjectCache) ipr ).getEventObject( oSource,
				RectangleRenderEvent.class );
		rre.updateFrom( b, dScale );
		ipr.fillRectangle( rre );
		ipr.drawRectangle( rre );
	}
	/**
	 * Renders the chart block.
	 * 
	 * @param ipr
	 * @param b
	 * 
	 * @throws ChartException
	 */
	protected void renderChartBlock( IPrimitiveRenderer ipr, Block b,
			Object oSource ) throws ChartException
	{
		final double dScale = getDeviceScale( );
		final RectangleRenderEvent rre = (RectangleRenderEvent) ( (EventObjectCache) ipr ).getEventObject( oSource,
				RectangleRenderEvent.class );
		rre.updateFrom( b, dScale );
		ipr.fillRectangle( rre );
		ipr.drawRectangle( rre );