crazy laser (maybe a boxy war add)

BinarySpike · Post by **BinarySpike** » Tue May 30, 2006 5:34 pm

after finding out "make -n" shows the linking commands... I can edit them to include the correct libcurl and dlcompat... I can run plugins and libcurl on my mac

Now anyway, I'm working on a plugin called crazy laser, it works in rabbit hunt, ctf, and ffa...

You define a laser position, time, and several settings

the laser fires from it's position every "time" seconds... so if you set a laser for for 3 seconds
The laser would target players every 3 seconds and fire... (tracking them with laser)

Basically there are some things... Player and Distance and Flag.

Player is the highest player, Distance is the closest player to the "objective", and Flag is a good or bad flag

For example, CTF would be a base... so if a high ranking player was near a base then the claser would be more apt to shoot him...

The claser does NOT target ST's, or CL's

For example

you could set Player to any, Distance to any, and Flag to bad, and set the time to 3... now when the laser doesn't have anybody to target it will idle when that happens it has to "load" up and will shoot the moment it has a target and is loaded...

so in this case whenever somebody picked a bad flag up the laser will load for three seconds (if time is 3) and then fire at the player...

Laggy players it won't shoot to well

but I hope to have a doppler calculator (which is cake to make)

The targeting and the firing should be easy but the actually setting's setting should be hard...

I've only done one other plugin so far... anyway... what do you guys think?

I_Died_Once · Post by **I_Died_Once** » Tue May 30, 2006 6:45 pm

...we got Death Star!

chandler583 · Post by **chandler583** » Tue May 30, 2006 8:11 pm

Sounds pretty good, can't wait to see it for real.

Post by **L4m3r** » Tue May 30, 2006 8:59 pm

I've thought about doing some sort of sentry gun, and a laser is definitely the way to go, thanks to a negligeable travel time.

You'd need to do a little trig and some dead reckoning (for lag). I think it could be done easily enough.

BinarySpike · Post by **BinarySpike** » Thu Jun 01, 2006 5:53 pm

requires a server mod

My trig won't work... I've tryed everything I could think of...
(i'm not a math wiz... I do know some trig but this is just to hard)

I could mod the server so that we could use something other than direction and tilt (which is throwing me off)

That "might" be nice but would probably not sit well with the devs if I sent a patch in... if ya'll want to see my code here it is...
(I tried converting to degrees... radians works ONLY if the x isn't negative... and I don't know enough about radians/atan to tell what I'm doing wrong)

Code: Select all

void claser::process(bz_EventData *eventData)
{
bzAPIIntList targetsList;
//bz_PlayerRecord * targetRec;

bz_PlayerSpawnEventData *targetRec = (bz_PlayerSpawnEventData*)eventData;


//targetRec = bz_getPlayerByIndex(0);

if (targetRec == NULL /*!= NULL && !bz_updatePlayerData (targetRec)*/)    // update the target
    {
    bz_debugMessage(4, "couldn't update target");
    }

float reloadTime = (float)bz_getBZDBDouble("_reloadTime") * (float)bz_getBZDBDouble("_laserAdRate");

// calculate direction and tilt...
float x = targetRec->pos[0] - laserpos[0], y = targetRec->pos[1] - laserpos[1], z = targetRec->pos[2] - laserpos[2];

// convert targetDir to a tilt and direction
float tilt = 0, direction;

#define myPI 3.14159265
  float tiltX = sqrt(pow(x,2) + pow(y,2));
  float dirX = sqrt(pow(x,2) + pow(z,2));

direction = atan2(y,dirX);
tilt = atan2(z, tiltX);

bz_fireWorldWep("L",reloadTime,BZ_SERVER,laserpos,tilt, direction, 0, 0.0f);
bz_debugMessage(0, bz_format("xyz %f %f %f, tilt %f, direction %f", x, y, z, tilt, direction));
}

It fires correctly if x isn't negative... it misses if it is... also laserpos is the location of the laser... which in this case is 0,0,15 (center, 15 units up)

Hannibal · Post by **Hannibal** » Thu Jun 01, 2006 8:35 pm

I love the idea..works wonders for the Planet Mofo theme..

BinarySpike · Post by **BinarySpike** » Fri Jun 02, 2006 2:50 am

It requires a server mod for timestamps on players last update...

Waistless · Post by **Waistless** » Fri Jun 02, 2006 6:50 am

man that would rock! having a bad flag which would make a world weapon fire on you

on thing though, for laser would it be able to sucessfully shoot players with lag? *cough*myself*cough*

better still, have a flag which launches "TAG(Target Aquisition and Guidance)Bullets", and when they hit the player, the world weapon then starts firing upon them, OR have you (or other players) automatically aim and fire at them.

MonsterMan++ · Post by **MonsterMan++** » Fri Jun 02, 2006 8:06 am

Hey it looks good! Actually that's pretty awesome. It's a smart laser, so you should make it a little less better.

BinarySpike · Post by **BinarySpike** » Fri Jun 02, 2006 5:05 pm

Waistless wrote:man that would rock! having a bad flag which would make a world weapon fire on you

on thing though, for laser would it be able to successfully shoot players with lag? *cough*myself*cough*

better still, have a flag which launches "TAG(Target Acquisition and Guidance)Bullets", and when they hit the player, the world weapon then starts firing upon them, OR have you (or other players) automatically aim and fire at them.

That would require a massive client mod, along with a massive server mod... waaay to hard for me... and I can't even get my trig to work fully...

About the lag, that's easy... can't remember what JeffM called it but I call it doppler... (yeah totally out of context)

I've tried this exact same thing using a client mod... (where I could shoot a player that was below me or to my side... and hit him)

But lag made me miss... so I had to hit non-moving tanks...

I might just compensate for lag only if the player has a bunch of it... that way the laser wouldn't hit players moving perpendicular to it (like a GM dodge) but stopped/parallel it would hit

BinarySpike · Post by **BinarySpike** » Fri Jun 02, 2006 11:03 pm

To hard to make... not the trig... would require to much of a server mod to do it... useless except on custom servers... so no... I'm gonna work on obj to bzw instead

Enigma · Post by **Enigma** » Sat Aug 12, 2006 8:15 am

BinarySpike wrote:requires a server mod

My trig won't work... I've tryed everything I could think of...
(i'm not a math wiz... I do know some trig but this is just to hard)

I could mod the server so that we could use something other than direction and tilt (which is throwing me off)

That "might" be nice but would probably not sit well with the devs if I sent a patch in... if ya'll want to see my code here it is...
(I tried converting to degrees... radians works ONLY if the x isn't negative... and I don't know enough about radians/atan to tell what I'm doing wrong)
Code: Select all
void claser::process(bz_EventData *eventData)
{
bzAPIIntList targetsList;
//bz_PlayerRecord * targetRec;

bz_PlayerSpawnEventData *targetRec = (bz_PlayerSpawnEventData*)eventData;


//targetRec = bz_getPlayerByIndex(0);

if (targetRec == NULL /*!= NULL && !bz_updatePlayerData (targetRec)*/)    // update the target
    {
    bz_debugMessage(4, "couldn't update target");
    }

float reloadTime = (float)bz_getBZDBDouble("_reloadTime") * (float)bz_getBZDBDouble("_laserAdRate");

// calculate direction and tilt...
float x = targetRec->pos[0] - laserpos[0], y = targetRec->pos[1] - laserpos[1], z = targetRec->pos[2] - laserpos[2];

// convert targetDir to a tilt and direction
float tilt = 0, direction;

#define myPI 3.14159265
  float tiltX = sqrt(pow(x,2) + pow(y,2));
  float dirX = sqrt(pow(x,2) + pow(z,2));

direction = atan2(y,dirX);
tilt = atan2(z, tiltX);

bz_fireWorldWep("L",reloadTime,BZ_SERVER,laserpos,tilt, direction, 0, 0.0f);
bz_debugMessage(0, bz_format("xyz %f %f %f, tilt %f, direction %f", x, y, z, tilt, direction));
}
It fires correctly if x isn't negative... it misses if it is... also laserpos is the location of the laser... which in this case is 0,0,15 (center, 15 units up)

I haven't read the documentation for all of these functions, but I'm guessing tilt is an angle for up/down and direction is for left/right. If so, I think you should use the normal arctan function instead of atan2 when calculating the tilt. I think your problem is that atan2 returns an angle in the correct quadrant based on the signs of the parameters.

EDIT: Just a side note: x*x is faster than pow(x,2).

YET ANOTHER EDIT:
This part of your code doesn't make sense:

Code: Select all

  float tiltX = sqrt(pow(x,2) + pow(y,2));
  float dirX = sqrt(pow(x,2) + pow(z,2));
  direction = atan2(y,dirX);
  tilt = atan2(z, tiltX);

It looks like you have a point in space with your x, y, and z variables (basically a vector), and you want to find an angle between the vector and an axis. If the sqrt(x^2 + y^2) equation gives you the magnitude of the vector (the hypotenuse), why are you using arctan(some_side/hypotenuse) when tan(theta) = opposite/adjacent and arctan(opp/adj) = theta?

GMMan · Post by **GMMan** » Sat Aug 12, 2006 7:01 pm

This plugin would probably drive me nuts trying to dodge it (if possible!) Though still, this is a great idea. It might work for a map I'm thinking of making.

BinarySpike · Post by **BinarySpike** » Wed Dec 20, 2006 3:31 am

Ok for everyone's information, with inchworm's help I was able to figure the problem out.

As slayer++ said, atan2 only gives me correct information for a specific quadrant (at the time I didn't know what a quadrant is)

Strangly I figured this, not in the exact sense, but I thought how I would do it, but didn't want to sit down and write it all out...

Like I said, there would need to be and update for a timestamp to actually calculate a tanks position, based on his speed and the last update and the current time, you could extropolate a "current" position minus lag, then add a lag fudge.

Also, GMMan, the laser wouldn't be accurate, if you stopped moving it would kill you in an instant, but depending on lag, and how MsgPlayerUpdate works, you would get hit less.

I could also add a "player" target, higher lag players that don't get hit as much could be targeted, or based on how many times the laser has hit a specific tank. That way it wouldn't go after less laggy players more. kidna like handicap

Atm I'm finishing up my iBZEdit, but I might go ahead and do this now with my knowledge of atan2

I'll start a new post if I get anything, thanks