much thanks

i think i understand what u mean
first i try to use 2d collision, it will work for now
but i think i need 3d collision later :roll:

thank u again for trying to read the tutorial, i hope u can help me
with the slide effect

what mean the first parameter by glusphere?
Code:
GLusphere(gluNewQuadric, radius,singlevar1,singlevar2);
can anyone give me an example plz?

or how i can create a sphere?