ccVertex3F CCGrid3DAction::vertex(const CCPoint& position)
{
    CCGrid3D *g = (CCGrid3D*)m_pTarget->getGrid();
    return g->vertex(position);
}
	ccVertex3F CCGrid3DAction::vertex(cocos2d::ccGridSize pos)
	{
		CCGrid3D *g = (CCGrid3D*)m_pTarget->getGrid();
		return g->vertex(pos);
	}