add ground
Add sort building function to determine the order of reading dat file.
updated the model points, now we can sort the compound models. (the whole building)
make the photo generated from camera is at centre
easy way for setting the camera path.
just set the initial frame and end frame
change the naming way of result files
make the angle translating be corresponding with angle rotating
fixed the bugs of not rotating
changing the shading specially for 2nd path
get back the ground
updated the ground  grass to a larger size,final version