Collision detection of a source, from top to bottom http://www.gamasutra.com/features/19991018/Gomez_5.htm

Packet : 11912885greenvalley_demo1.0_win32.zip filelist
exe/
exe/bb.bat
exe/BB.opt
exe/brickbreaker/
exe/BRICKBREAKER.mod
exe/brickbreaker/actor_ball.gc
exe/brickbreaker/actor_bat.gc
exe/brickbreaker/actor_brick.gc
exe/brickbreaker/actor_brick_breakable.gc
exe/brickbreaker/actor_sprite.gc
exe/brickbreaker/ball.tga
exe/brickbreaker/bat.tga
exe/brickbreaker/brick.tga
exe/brickbreaker/dependence.txt
exe/brickbreaker/game_brickbreaker.gc
exe/brickbreaker/option_brickbreaker.gc
exe/brickbreaker/ouput_window.gc
exe/brickbreaker/readme.txt
exe/button0.tga
exe/CollisionTest.dll
exe/ct.bat
exe/Default.opt
exe/GRASS.TGA
exe/GVC.exe
exe/GV_Base.dll
exe/GV_Drv_DX8.dll
exe/GV_Engine.dll
exe/GV_Launch.exe
exe/GV_Math.dll
exe/GV_Physics.dll
exe/GV_Render.dll
exe/GV_UI.dll
exe/GV_Utility.dll
exe/GV_VM.dll
exe/readme.txt
exe/TEST.mod
exe/wood.TGA
exe/yylex.log

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