mood

hello!!!! i almost complete the "mood control", you can choose
"furious"\"angry"\"calm" to see different posture. and i hope you can
add some new actions for the tank if you come up with any ideas~~
HOWEVER, i met a problem to I render a second cannon ball when "furious"
or "angry" is chosen.  You will see what's wrong when you choose these
two modes. And i left some comments before the code rendering the second
but wrong-placed cannon ball. Hope you can find my four-line comments
there and fix that problem. The last thing is : remember you add the
second kind of cannon type? In the code rendering that cannon, I found
there were two "popmatrix()". And in the latest version, I add "//"
before the second  "popmatrix()" which is just in the last line of that
code snippet, hope you can find it. And I really wanna know if it surely
needs two lines of "popmatrix()" or you added the second "popmatrix()"
by mistake.
small change( you can ignore this one

Look at the change before and I left you a long message ^^