hey, couple of simple questions

How do you use 'accelerate' without the system crashing and I mean a simple program I'm literally messing about with script 18 from the online tutorial pack of scripts.

var accel = 5
var accelneg = -5
function main()
{
level_load ("work18.wmb");

}

action move_me()
{
while(!key_cuu) wait(1); // wait for up key
while(1)
{
if (key_cuu) accelerate(NULL, accel, 1) ;
if (key_cud) accelerate(NULL, accelneg, 1);


var distance_fwdorbck = (key_cuu-key_cud) *5*time_step;

c_move(me, vector(distance_fwdorbck,0,0), NULL, GLIDE);
my.pan += (key_cul-key_cur)*2*time_step;
wait(1);
}
}

It runs the program fine, but then says system crash in move_me: SYS in an error window when I run the program and press up.

If you don't know why the above happens could you tell me how to accelerate an object another way

Cheers.

You can't pass NULL as the first parameter to accelerate. It needs a pointer to a var, and it will change the value stored in this var.

Jibb

Cheers, I got rid of the NULL and replaced them both with distance_fwdorbck (which is the variable (key_cuu-key_cud)*5

And it doesn't crash anymore, but it doesn't accelerate either, just stays at a constant speed.

Anyway could I make the object accelerate at a certain rate?

Or is there anyway I could increment the variable above by a certain amount every second the corresponding button is being held down?

Thanks again.

Perhaps reduce the friction (third parameter)?

Jibb