use
added color opacity, corrected a few errors
initial commit
use
continued edits
add 3D light test to chapter 9
Merge pull request #7 from lvlonggame/master

add 3D light test to chapter 9
initial commit
use
initial commit
fixed demo title
Merge remote-tracking branch 'upstream/master'

Conflicts:
	proj.ios_mac/Programmers Guide.xcodeproj/project.pbxproj
add chapter 6 target