yeah shadows working again

I actually got stuck on this for several days,  which was frustrating, I have a shadow demo already and transferred the code to my main test demo, and it didn't work.. Utter confusion, why would it work one demo and not another... it took me several days to realize that my shadow demo project used a much smaller terrain and this one was much bigger and also the light source was stuck in a corner.....

grrr, oh well, its like most bugs, if you have never seen the behaviour before you simple can't see it. I assumed something was up with my code or the new Rasbpian Stretch..but no it was me, I didn't set it up right...but there you are, fixed now...with help from some of my facebook friends.

Behold shadowmapping shadows.
Not the best system for shadows, they tend to be hard and pixelly, but the fact is the Pi's GPU does not really have the power to do the sampling needed to create softer AA shadows so its as good as it will get for now.

Ahthankyew