vec_set(temp.x, my.x);
temp.z -= 10000;
floor = c_trace(my.x, temp.x, IGNORE_ME | IGNORE_PASSABLE | USE_BOX | GLIDE); // compute the distance between player's origin and the floor below its feet


if(key_space && floor < 30 && jump == 0 && J == 0)
{
jump = 1;
}
if(jump == 1)
{

c_move(me,vector(0, 0, 20*time_step), nullvector, GLIDE);
J = 1;
}
if(floor > 30)
{
jump = 2;
}
if(floor < 30 && !key_space)
{
jump = 0;
J = 0;
}

i've wrote this code for jumping but i found a problem: when i jump on a plataform and the player is in th air, there seem to be a tracing problem because when there's an obstacle beneath the player the tracing sets to 0 and it keep increasing altitude.

ah, you need a floor on z < 10000. Otherwise the c_trace cant find a reason to push ur player to the ground. With reason I mean anything the trace could hit.

oh, i dont know where should i put that z < 10000 on my code help please?

Ah man, you need a floor or a ground in your level. The c_trace will not hit anything else if you dont have a ground/floor and you will fly...

but i do have a floor. tee level is a hollow cube with blocks and models as plataforms

if im correct here glide is not a mode flag for c_trace
each mode flag has a value and your giving a value
that should not be used with c_trace ,it might aswell
have the same value as another mode flag like ignore_world
and then c_trace wont work...(not sure)
if floor<=0 then no polygon's hit!

try: floor = c_trace(my.x, temp.x, IGNORE_ME | IGNORE_PASSABLE | USE_BOX );

Woah didnt see this^^