Question, where should we post bugs we find in the MDX common framework? For example, this line:

dragRectangle = new System.Drawing.Rectangle(int.MinValue, int.MinValue, int.MaxValue, int.MaxValue);

Does not work as you intended (so the FirstPersonCamera does not work out of the box). The 3rd and 4th parameters are width and height values, not X2,Y2. So the rectangle does not include any positive values.

I forgot to say. I got the 1st person camera working by changing this line to

dragRectangle = new System.Drawing.Rectangle(int.MinValue/2, int.MinValue/2, int.MaxValue, int.MaxValue);

In Chapter 16 using D3D for 2d Graphics
Creating a full screen rendering device
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After I run the application,if I press
Alt+ Tab button ,it will throw a exception.
How can solve this problem?
Thanks!

Here's another one, and I would really appreciate help with this.

Page 149: "it's probably not a great to store multiple versions of a mesh"

Page 157: "It's common to store multiple versions of a mesh"

Which statement is correct? They are both referring to levels of detail in a mesh.

Oops I meant to type "not a great *idea*"