DirectX 中实现MMORPG类游戏中的HUD功能。即人物头顶文字、血条等效果。因为HUD是在3D空间中，所以可以实现远近缩放效果。-DirectX implementation of MMORPG games in HUD functionality. That the figures above characters, the effect of blood, etc.. Since HUD is in the 3D space, so can achieve the effect of