entity passing through everything

#include <default.c>
#include <acknex.h>

ENTITY* player_box;
var jump = 0;

function cam()
{
	while (1)
	{
		camera.x = player_box.x - 100;
		camera.z = 300;
		camera.y = 0;
		camera.tilt = -50;
		wait (1);
	}
}

function land()
{
	if (event_type == EVENT_BLOCK)
	{
		jump = 0;
	}
}
function shoot()
{
	while (1)
	{
		if (key_space)
		{
			jump = 20;
			while (1)
			{
				c_move (player_box, nullvector, vector(0, 0, jump*time_step), GLIDE);
				jump = jump - 0.2;
				if (event_type == EVENT_BLOCK){break;}
				wait(1);
			}
		}
		wait(1);
	}
}
action player_move()
{
	player_box = my;
	c_setminmax(my);
	my.emask |= ENABLE_BLOCK;
	my.event = land;
	cam();
	shoot();
	while (1)
	{
		c_move (my, nullvector, vector (1*time_step, 20*(key_a-key_d)*time_step, 0),GLIDE);
		wait (1);
	}
}
function main()
{
	level_load ("level.wmb");
}

var dist_z;
 var dist2ground = 0;
 dist2ground = c_trace(my.x, vector(my.x, my.y, my.z-1000)...USE_BOX
 if(dist2ground > 2 || dist2ground == 0){
   accelerate(dist_z, -2.5 * time_step, -1);
   }
 else dist_z = 0; // jumping over stand on something

..
 c_move(me....vector(.., .., dist_z...

#include <acknex.h>
#include <default.c>

ENTITY* player_box;
var jump = 0;

function cam()
{
	while (1)
	{
		camera.x = player_box.x - 10;
		camera.z = 100;
		camera.y = player_box.y;
		camera.tilt = -50;
		wait (1);
	}
}

action my_car()
{
	player_box = my;
	cam();
	while (1)
	{
		c_move (my, nullvector, vector (1*time_step, 20*(key_a-key_d)*time_step, 0),GLIDE);
		wait (1);
	}
}
function main()
{
	level_load ("homework18.wmb");
}