Professional.XNA.Game.Programming的中文版本，上海第八中学物理组的一个老师翻译的。翻译的还不错-Professional.XNA.Game.Programming Chinese version, Shanghai, the eighth of a group of secondary school physics teacher translation. Good translation

关于xna shader 编程方面的。主要是介绍点光源和自阴影，希望对大家有帮助。-About xna shader programming aspects. Is to introduce a point source and self-shadows, we want to help.