it makes half a sphere invisible

it makes half a sphere invisible by geting an image and making it transparent

                                    ` This code was downloaded from The Game Creators
                                    ` It is reproduced here with full permission
                                    ` http://www.thegamecreators.com
                                    
                                    `half a sphere gone

`change the last two numbers in box lower
`then 635,470 and see what happens
box 0,0,235,400

`gets the image on the screen(dont change) 
get image 1,0,0,635,470

`create sphere
make object sphere 1,10

`texture object
texture object 1,1
set object 1,1,0,0

`loop
do

`see object
if upkey()=1 then pitch object down 1,5
if downkey()=1 then pitch object up 1,5
if leftkey()=1 then turn object left 1,5
if rightkey()=1 then turn object right 1,5
if spacekey()=1
set object 1,1,1,1
else
set object 1,1,0,0
endif
sync 
loop