Merge pull request #17 from guanlun/master

can now change viewport
Merge pull request #18 from guanlun/master

merge
Merge pull request #19 from guanlun/master

changed vertex container to array
what have I done
Merge pull request #20 from liligeng111/master

what have I done
debug
for loop
random changes
Merge branch 'master' of github.com:hkust-psan1/FYP
threshold
merge
added blender script for obj file export