I can't seem to get anything to work right. I try to look at the manual, and improvise from there to fit my needs, but no cigar.

I just want to make it so that you can touch the entity with the mouse and light it up, but apparently it's way more complicated than I thought.

Here's my Code:

---

var video_mode= 8;
var video_screen= 1;
var video_depth= 32;

bmap cur= "bcursor.pcx";

function mouse_toggle()
{
	mouse_mode+= 1;
	mouse_mode%= 3;
	mouse_map= cur;
	while(1)
	{
		mouse_pos.x= pointer.x;
		mouse_pos.y= pointer.y;
		wait(1);
	}
}

function main()
{
	level_load ("vec_test.wmb");
	on_m= mouse_toggle;
	while(1)
	{
		vec_for_screen(vector(mouse_pos.x,mouse_pos.y,-1000),camera);
		wait(1);
	}
}

action dummy_cam
{
	my.fat= on;
	my.narrow= on;
	c_setminmax(me);
	while(1)
	{
		camera.x= my.x;
		camera.y= my.y;
		camera.z= my.z;
		my.pan= camera.pan;
		my.tilt= camera.tilt;
		my.roll= camera.roll;
		if (mouse_left== on) && (mouse_mode<= 1)
		{
			c_move (my,vector(20 * time_step,0,0),nullvector,glide);
		}
		if(mouse_right== on) && (mouse_mode<= 1)
		{
			c_move (my,vector(-20 * time_step,0,0),nullvector,glide);
		}
		if(mouse_left== on) && (key_shift== on) && (mouse_mode<= 1)
		{
			c_move (my,vector(30 * time_step,0,0),nullvector,glide);
		}
		if(key_z== on) && (mouse_mode<= 1)
		{
			c_move (my,vector(0,10 * time_step,0),nullvector,glide);
		}
		if(key_x== on) && (mouse_mode<= 1)
		{
			c_move (my,vector(0,-10 * time_step,0),nullvector,glide);
		}
		camera.pan-= mouse_force.x * 10 * time_step;
		camera.tilt+= mouse_force.y * 10 * time_step;
		wait(1);
	}
}

function light_event()
{
	if(event_type== event_touch)
	{
		my.ambient= 200;
	}
}

action light_when_touched
{
	my.enable_touch= on;
	my.event= light_event;
	my.polygon= on;
	while(1)
	{
		vec_to_screen(vector(my.x,my.y,my.z),camera);
		wait(1);
	}
}

---

EDIT: Sorry for the "tone", I'm just a little frustrated.

it's not so hard
and in this case you don't need to vec_to_scrreen or vec_for_screen function

in main function:
mouse_mode =1;
mouse_range = 9999;

in entity's action:
my.enable_touch = on;
my.enable_release = on;
my.event = some_event;

function some_event
{
if(event_type == event_touch){my.transparent = on; my.flare = on;}
if(event_type == event_release){my.transparent = off; my.flare = off;}
}

BTW:
vec_to_scrren you are usin when you want to check if something is visible on the screen, f.e. if sun is visible create flare
Code:

---

vec_set(temp,you.x); //you = sun, enemy... etc
if (vec_to_screen(temp,camera)){make some action like create panel or flare etc}

---

vec_for_scrren you are using when you want to f.e. trace from camera to mouse position in 3d world to create f.e. bullet hole on the wall
Code:

---

	MOUSE_POS.x = pointer.x; MOUSE_POS.y = pointer.y;
	temp.x = MOUSE_POS.x;
	temp.y = MOUSE_POS.y;
	temp.z = 1000; //this could be f.e. gun range
	vec_for_screen(temp,CAMERA);
	c_trace(player.x,temp,ignore_me | ignore_passable);
	if(mouse_left ==1) && (result !=0){vec_set(temp.x,target);ent_CREATE("hole.tga",temp.x,hole_function};

---

Ok, but it's still not doing anything. Maybe I need to put the ifs into a while(1) loop?

About vec_for_screen / vec_to_screen:
Of'course You have to put those codes into a loop

About events:
You don't have to