The glass part I totally understand! thankz for the good example!
I tried to understand the last part but I can't make something out of it....

I really tried to figure it out but I still have nothing adchieved...
I have add another attach. so maybe you have an idea >>?

I really want to show the people what I did with cps because it's a hell of a tut!! and I like it a lot! GREAT JOB!
thankz for looking!