Laser Dot.. how?

craze · **Author**

How would i make a laser dot that goes on whatever wall your aiming at like the rocket launcher from the original half-life?
I just have to get where the user is aiming and spawn a transperent sprite wherever they aim. I think I'd use aimvec or something but im not sure how. Are there any heroes that have this that I can look at? Is it even possible?
I really need to know how to do this. Thanks for your help all.

Batman/Gorlag · 10-25-2005 , 02:44

Code:

/* Gets origin from player.
* Modes:
* 0 - current position.
* 1 - position from eyes (weapon aiming).
* 2 - end position from player position.
* 3 - end position from eyes (hit point for weapon). 
* 4 - position of last bullet hit (only CS). */
native get_user_origin(index, origin[3], mode = 0);

This is the answer you are looking for.

yang · 10-25-2005 , 04:30

laser dot:

precache "sprites/laserdot.spr"

use the additive sprite 17.

get the aim vector.

then:

Code:

#define TE_SPRITE     17    // additive sprite, plays 1 cycle 

message_begin(MSG_ ,SVC_TEMPENTITY) //message begin 
write_byte(TE_) 
write_coord() // start position 
write_coord() 
write_coord() 
write_short() // sprite index 
write_byte() // scale in 0.1's 
write_byte() // brightness 
message_end()

craze · 10-25-2005 , 20:04

Im kind of having a little trouble with the help you guys gave me, but it did help get me on track some more and i really appreciate it. Thanks.

I found 2 codes (on amxmodx forums) for a laser sight and I dont know which one to use or how to modify them to match what i want. Can someone help me figure out how to do this.

Here's the first example i found:

Code:

ls_dot = precache_model("sprites/laserdot.spr")

Code:

new aimvec[3]
    get_user_origin(id,aimvec,3)

    //Make the Laser Dot
    message_begin( MSG_BROADCAST,SVC_TEMPENTITY)
    write_byte( 17 )
    write_coord(aimvec[0])
    write_coord(aimvec[1])
    write_coord(aimvec[2])
    write_short( ls_dot )
    write_byte( 10 )
    write_byte( 255 )
    message_end()

And here's the 2nd one (using same precache as above):

Code:

public make_dot(vec[])
{
    message_begin( MSG_BROADCAST,SVC_TEMPENTITY)  
    write_byte( 17 ) 
    write_coord(vec[0]) 
    write_coord(vec[1]) 
    write_coord(vec[2])
    write_short( ls_dot ) 
    write_byte( 10 ) 
    write_byte( 255 ) 
    message_end()
}

So i guess they both do the same thing and they're just a tad bit different.
Here's the code im thinking of using (written by myself):

Code:

public laserAimLoop()
{
    for( new id = 1; id <= SH_MAXSLOTS; id++ ){
        if( !is_user_alive(id) || !shModActive() || !gHasHeroPower[id] ) return
        //Get origin of user
        new aimvec[3]
        get_user_origin(id,aimvec,3)

        //Make laser dot
        message_begin( MSG_BROADCAST,SVC_TEMPENTITY)
        write_byte( 17 )
        write_coord(aimvec[0])
        write_coord(aimvec[1])
        write_coord(aimvec[2])
        write_short( ls_dot )
        write_byte( 10 )
        write_byte( 255 )
        message_end()
    }
}

would that work? would that make a laser sight for all players that have the hero and have it follow there cursor no matter what? Thanks for your help all.

**Emp`** · 10-25-2005 , 20:55

edit: nvm, that looks like it should work, why dont you test it yourself?

craze · 10-25-2005 , 21:05

i dont have cs on this computer.
my main computer got messed up and i have to repair windows.

I changed the code around a tiny bit and made the error checking better:

Code:

ls_dot = precache_model("sprites/laserdot.spr") 

public laserAimLoop()
{
    if(!shModActive()) return
    for( new id = 1; id <= SH_MAXSLOTS; id++ ){
    if(!gHasHeroPower[id]) return
     if(is_user_alive(id))
     {
         //Get origin of user
                new aimvec[3]
                get_user_origin(id,aimvec,3)

                //Make laser dot
                message_begin( MSG_BROADCAST,SVC_TEMPENTITY)
                write_byte( 17 )
                write_coord(aimvec[0])
                write_coord(aimvec[1])
                write_coord(aimvec[2])
                write_short( ls_dot )
                write_byte( 10 )
                write_byte( 255 )
                    message_end()
    }   
    }

}

Does my code remove the laser dot when they die or do I have to add that in? I'm not sure how I would do that.
So do you guys see any errors... do you think it will work the way i want it to?
thanks for all your help guys

Batman/Gorlag · 10-25-2005 , 23:04

If the user dies, the whole laser thing doesn't get executed at all because you made the check is_user_alive(id). So it's good so far.

craze · 10-25-2005 , 23:15

Quote:

Originally Posted by Gorlag/Batman

it's good so far.

what do you mean so far? that's it. that's all the code right?

yang · 10-26-2005 , 00:49

if(!shModActive()) return
for( new id = 1; id <= SH_MAXSLOTS; id++ ){
if(!gHasHeroPower[id]) return
if(is_user_alive(id))

you can just do somethign like this and make it look way cleaner:

Code:

    for( new id = 1; id <= SH_MAXSLOTS; id++ ){ 
        if ( !shModActive() || !gHasHeroPower[id] || !is_user_alive(id)
        {
            // do code
          }
}

and yes, thats all the code you'll need for laser dot to loop.

**Emp`** · 10-26-2005 , 08:43

yang, wouldnt that make it so it does the loop if sh is off, they dont have the power, or theyre dead?

shouldnt it be like

Code:

    for( new id = 1; id <= SH_MAXSLOTS; id++ ){ 
        if ( shModActive() && gHasHeroPower[id] && is_user_alive(id) )
        {
            // do code
        }
}