OpenGL Book Progress Report for March 2007

I haven't posted anything about the OpenGL book for a while, but I am writing to let you know I am still working on it. Progress has been excruciatingly slow, which has been very frustrating to me. On the code front, I've been working on the physics code. On the writing front, I have a lot of material written on several chapters, but I still don't have a finished chapter. Whenever I write about something, it brings up several additional topics I have to write about. When I write about those topics, it brings up more things to write about, which makes finishing difficult.