xna 4.0 在3D 场景中用spritebatch 写2D文字3D显示不正常的问题

     用SpriteBatch 在3D场景中写文字时，会把GraphicsDevice中的参数改掉，因此为了正确显示3D场景，需要在spriteBatch.end() 结束后，把改动过的参数恢复回来。

    具体代码如下： 

    

 // Draw info
            spriteBatch.Begin();
            string str = "Avatar position " + avatarPosition.ToString();
            Vector2 ms = Font.MeasureString(str);
            Vector2 position;
            position.X = (this.Window.ClientBounds.Width - ms.X) / 2.0f;
            position.Y = 0;
            spriteBatch.DrawString(Font, str, position, Color.BlueViolet);
            str = "Avatar direction" + avatarDirection.ToString();
            position.Y = position.Y + 20;
            spriteBatch.DrawString(Font, str, position, Color.BlueViolet);

            str = "Camera Target" + camera.Target.ToString();
            position.Y = position.Y + 20;
            spriteBatch.DrawString(Font, str, position, Color.BlueViolet);

            str = "Camera Position" + camera.Position.ToString();
            position.Y = position.Y + 20;
            spriteBatch.DrawString(Font, str, position, Color.BlueViolet);

            str = " Avatar rotation radion" + avatarLeftRightRot.ToString();
            position.Y = position.Y + 20;
            spriteBatch.DrawString(Font, str, position, Color.BlueViolet);
            spriteBatch.End();

　　恢复原来的参数：

GraphicsDevice.BlendState = BlendState.Opaque;
            GraphicsDevice.DepthStencilState = DepthStencilState.Default;
            GraphicsDevice.SamplerStates[0] = SamplerState.LinearWrap;

            // TODO: Add your drawing code here
            basicEffect.VertexColorEnabled = false;
            basicEffect.TextureEnabled = true;
            basicEffect.Texture = textureFloor;
            basicEffect.World = Matrix.Identity;
            basicEffect.View = camera.ViewMatrix;
            basicEffect.Projection = camera.ProjectionMatrix;

            foreach (EffectPass pass in basicEffect.CurrentTechnique.Passes)
            {
                pass.Apply();
                device.SetVertexBuffer(groundVertexBuf);
                device.DrawPrimitives(PrimitiveType.TriangleStrip, 0, 2);
            }

比较下 恢复GraphicsDevices之前和之后的状态

看，这回地板出来了吧！

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参考文章链接：

http://blogs.msdn.com/b/shawnhar/archive/2010/06/18/spritebatch-and-renderstates-in-xna-game-studio-4-0.aspx?CommentPosted=true#commentmessage