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
* 
	 * @param loa
	 *            Location list.
	 * @param iProperty
	 *            This value must be one of following:
	 *            <ul>
	 *            <li>IConstants.MIN
	 *            <li>IConstants.MAX
	 *            <li>IConstants.AVERAGE
	 *            </ul>
	 * 
	 * @return
	 */
	public static final double getX( Location[] loa, int iProperty )
	{
		int iCount = loa.length;
		double dX = 0;
		if ( iProperty == IConstants.MIN )
		{
			dX = loa[0].getX( );
			for ( int i = 1; i < iCount; i++ )
			{
				dX = Math.min( dX, loa[i].getX( ) );
			}
		}
		else if ( iProperty == IConstants.MAX )
		{
			dX = loa[0].getX( );
			for ( int i = 1; i < iCount; i++ )
			{