...my current car script. use q,a,w,s to adjust the spring/damper values! use z/y,x if you have to flip the car (currently the car tends to flip over in narrow curves). if you have any ideas for improvements (or if you have a complete better script [Smile] ) please let us know!

code:
var video_mode = 9;
var video_depth = 32;

entity* p_player;
entity* p_FR_tyre;
entity* p_FL_tyre;
entity* p_RL_tyre;
entity* p_RR_tyre;

var d3d_alphadepth=32; 
var d3d_shadowdepth=24;
var d3d_lightres=on;

var max_entities=1000;
var max_ph_entites=500;

var clip_size=0;

on_f12=_tog_dbg;

string mdl_car=<car.mdl>;
string mdl_tyre=<tyre_0.mdl>;

//-----------------------------------------------------------------------------move_camera_player
function move_camera_player()
{
	camera.ambient=0;
	camera.arc=60;

	var cam_ang[3];
	var cam_dist=1500;
	cam_ang.pan=0;
	cam_ang.tilt=70;
	cam_ang.roll=0;


	while(1)
	{
		if(mouse_right)
		{
			cam_ang.pan+=10*mouse_force.x;
			cam_ang.tilt+=10*mouse_force.y;
			cam_ang.tilt=min(max(cam_ang.tilt,5),70);
		}
		else
		{
		}
		
		cam_dist-=mickey.z;
		cam_dist=min(max(cam_dist,300),3000);

		camera.x=p_player.x+cos(cam_ang.pan)*(cam_dist*cos(cam_ang.tilt));
		camera.y=p_player.y+sin(cam_ang.pan)*(cam_dist*cos(cam_ang.tilt));
		camera.z=p_player.z+sin(cam_ang.tilt)*cam_dist;
		vec_set(temp,p_player.x);
		vec_sub(temp,camera.x);
		vec_to_angle(camera.pan,temp);

		wait(1);
	}
}

var FR_wheel_ID;
var FL_wheel_ID;
var RL_wheel_ID;
var RR_wheel_ID;

var p1[3];
var p2[3];
var p3[3];
var p4[3];
var p5[3];
var p6[3];

var sc=1;
var dc=0.005;
//-----------------------------------------------------------------------------car setup
action FR_tyre
{
	p_FR_tyre=my;
	my.shadow=on;
	
	phent_settype(my,PH_RIGID,PH_SPHERE);
	phent_setgroup(my,2);
	phent_setmass(my,10,PH_SPHERE);
	phent_setfriction(my,80);
	phent_setelasticity(my,50,10);
	phent_setdamping(my,20,20);
	
	vec_set(p2,vector(0,0,1));
	vec_set(p3,vector(0,1,0));
	vec_set(p4,vector(-40,40,0));
	vec_set(p6,vector(sc,dc,0));
	FR_wheel_ID=phcon_add(PH_WHEEL,p_player,my);
	phcon_setparams1(FR_wheel_ID,my.x,p2,p3);
	phcon_setparams2(FR_wheel_ID,p4,nullvector,p6);
}


action FL_tyre
{
	p_FL_tyre=my;
	my.shadow=on;
	my.pan=180;

	phent_settype(my,PH_RIGID,PH_SPHERE);
	phent_setgroup(my,2);
	phent_setmass(my,10,PH_SPHERE);
	phent_setfriction(my,80);
	phent_setelasticity(my,50,10);
	phent_setdamping(my,20,20);
	
	vec_set(p2,vector(0,0,1));
	vec_set(p3,vector(0,1,0));
	vec_set(p4,vector(-40,40,0));
	vec_set(p6,vector(sc,dc,0));
	FL_wheel_ID=phcon_add(PH_WHEEL,p_player,my);
	phcon_setparams1(FL_wheel_ID,my.x,p2,p3);
	phcon_setparams2(FL_wheel_ID,p4,nullvector,p6);
}


action RL_tyre
{
	p_RL_tyre=my;
	my.shadow=on;
	my.pan=180;
	
	phent_settype(my,PH_RIGID,PH_SPHERE);
	phent_setgroup(my,2);
	phent_setmass(my,10,PH_SPHERE);
	phent_setfriction(my,90);
	phent_setelasticity(my,50,10);
	phent_setdamping(my,20,20);
	
	vec_set(p2,vector(0,0,1));
	vec_set(p3,vector(0,1,0));
	vec_set(p4,vector(0,0,0));
	vec_set(p6,vector(sc,dc,0));
	RL_wheel_ID=phcon_add(PH_WHEEL,p_player,my);
	phcon_setparams1(RL_wheel_ID,my.x,p2,p3);
	phcon_setparams2(RL_wheel_ID,p4,nullvector,p6);
}

action RR_tyre
{
	p_RR_tyre=my;
	my.shadow=on;
	
	phent_settype(my,PH_RIGID,PH_SPHERE);
	phent_setgroup(my,2);
	phent_setmass(my,10,PH_SPHERE);
	phent_setfriction(my,90);
	phent_setelasticity(my,50,10);
	phent_setdamping(my,20,20);
	
	vec_set(p2,vector(0,0,1));
	vec_set(p3,vector(0,1,0));
	vec_set(p4,vector(0,0,0));
	vec_set(p6,vector(sc,dc,0));
	RR_wheel_ID=phcon_add(PH_WHEEL,p_player,my);
	phcon_setparams1(RR_wheel_ID,my.x,p2,p3);
	phcon_setparams2(RR_wheel_ID,p4,nullvector,p6);
}

action car
{
	p_player=my;
	wait(1);
	my.shadow=on;
	my.material=mat_metal;
	
	phent_settype(my,PH_RIGID,PH_BOX);
	phent_setgroup(my,2);
	phent_setmass(my,160,PH_BOX);
	phent_setfriction(my,40);
	phent_setelasticity(my,50,10);
	phent_setdamping(my,20,20);
	
	vec_for_vertex(temp,my,306);
	ent_create(mdl_tyre,temp,FR_tyre);
	
	vec_for_vertex(temp,my,36);
	ent_create(mdl_tyre,temp,FL_tyre);
	
	vec_for_vertex(temp,my,5);
	ent_create(mdl_tyre,temp,RL_tyre);
	
	vec_for_vertex(temp,my,304);
	ent_create(mdl_tyre,temp,RR_tyre);
}

//--------------------------------------------------------------------------------control
function control()
{
	var m1_1[3];
	var m1_2[3];
	var m2[3];
	var wheel_target=0;
	while(1)
	{
		if(key_cul)
		{
			wheel_target=-38;
		}
		if(key_cur)
		{
			wheel_target=38;
		}
		if((!key_cul&&!key_cur)||(key_cul&&key_cur))
		{ 
			wheel_target=0;
		}
		if(key_cuu)
		{
			vec_set(m2,vector(-50,500,0));
		}
		if(key_cud)
		{
			vec_set(m2,vector(0,500,0));
		}
		if((!key_cuu&&!key_cud)||(key_cuu&&key_cud))
		{ 
			vec_set(m2,vector(0,0,0));
		}
		
		phcon_getposition(FR_wheel_ID,temp);
		vec_set(m1_1,vector((wheel_target-temp.x)*0.2,500,0));
		
		phcon_getposition(FL_wheel_ID,temp);
		vec_set(m1_2,vector((wheel_target-temp.x)*0.2,500,0));
		
		phcon_setmotor(FR_wheel_ID,m1_1,m2,nullvector);
		phcon_setmotor(FL_wheel_ID,m1_2,m2,nullvector);
		phcon_setmotor(RR_wheel_ID,nullvector,m2,nullvector);
		phcon_setmotor(RL_wheel_ID,nullvector,m2,nullvector);
		
		wait(1);
	}
}

string s1;
string s2;
//--------------------------------------------------------------------------------debug
function debug()
{
	while(1)
	{
		str_cpy(s1,"sc: ");
		str_for_num(s2,sc);
		str_cat(s1,s2);
		draw_text(s1,20,100,vector(255,255,255));
		str_cpy(s1,"dc: ");
		str_for_num(s2,dc);
		str_cat(s1,s2);
		draw_text(s1,20,124,vector(255,255,255));
		wait(1);
	}	
}

//--------------------------------------------------------------------------------set_scdc
function set_scdc()
{
	vec_set(p6,vector(sc,dc,0));
	phcon_setparams2(FR_wheel_ID,vector(-40,40,0),nullvector,p6);
	phcon_setparams2(FL_wheel_ID,vector(-40,40,0),nullvector,p6);
	phcon_setparams2(RL_wheel_ID,nullvector,nullvector,p6);
	phcon_setparams2(RR_wheel_ID,nullvector,nullvector,p6);	
}
function inc_sc()
{
	while(key_q)
	{
		sc+=0.001;
		sc=min(max(sc,0),100);
		set_scdc();
		wait(1);
	}
}
function dec_sc()
{
	while(key_a)
	{
		sc-=0.001;
		sc=min(max(sc,0),100);
		set_scdc();
		wait(1);
	}
}
function inc_dc()
{
	while(key_w)
	{
		dc+=0.001;
		dc=min(max(dc,0),100);
		set_scdc();
		wait(1);
	}
}
function dec_dc()
{
	while(key_s)
	{
		dc-=0.001;
		dc=min(max(dc,0),100);
		set_scdc();
		wait(1);
	}
}
on_q=inc_sc;
on_a=dec_sc;
on_w=inc_dc;
on_s=dec_dc;

//--------------------------------------------------------------------------------flip
function flipl()
{
	phent_addtorquelocal(p_player,vector(-100000,0,0));
}

function flipr()
{
	phent_addtorquelocal(p_player,vector(100000,0,0));
}

on_z=flipl;
on_x=flipr;

//--------------------------------------------------------------------------------initialize_physics
function initialize_physics
{ 
	ph_setgravity(vector(0,0,-380));
	ph_setcorrections(20000,0.1); 
}

//--------------------------------------------------------------------------------main
function main()
{
	level_load("physics_test.wmb");
	wait(1);

	sun_angle.pan=210;
	sun_angle.tilt=25;

	camera.clip_near=50;
	camera.clip_far=50000;
	camera.arc=75;

	ent_create(mdl_car,vector(0,0,200),car);
	initialize_physics();
	
	while(p_player==null){wait(1);}
	move_camera_player();
	control();
	debug();
}