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Here is the tutorial that I followed to come up with the
Jetpack in Ultra. This tutorial in essence, got the ball rolling for the
rest of the mod. This tutorial should be appearing on Code3arena
shortly.
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by Crawdad_Cletis This
tutorial was created in response to a request on the quake3world forums
requesting a Tribes style jetpack. It is intended to give you a start, not
make the sweetest jetpack man has ever known.
1. NEW COMMAND BUTTON...First we need to define a button to use for activating the jetpack. Go to qshared.h and search for "BUTTON_ANY". Then add the line below right after it.#define BUTTON_ANY 2048 // any key whatsoever #define BUTTON_JETPACK 4096 // use the jetpack 2. CREATING A NEW MOVE FUNCTIONBust open bg_pmove.c. Add the following function anywhere north of the function PmoveSingle (I put it between PM_FlyMove and PM_AirMove)./*
===================
PM_JetpackMove
Use the jetpack.
===================
*/
static void PM_JetpackMove( void ) {
int i;
vec3_t wishvel;
float wishspeed;
vec3_t wishdir;
float scale;
// normal slowdown
PM_Friction ();
scale = PM_CmdScale( &pm->cmd );
//
// user intentions
//
if ( !scale ) {
wishvel[0] = 0;
wishvel[1] = 0;
wishvel[2] = 255; //< this is upward thrust (bigger number, more thrust)
} else {
for (i=0 ; i<3 ; i++) {
wishvel[i] = scale * pml.forward[i]*pm->cmd.forwardmove + scale * pml.right[i]*pm->cmd.rightmove;
}
}
VectorCopy (wishvel, wishdir);
wishspeed = VectorNormalize(wishdir);
PM_Accelerate (wishdir, wishspeed, pm_jetpackaccelerate); //< use the jetpack acceleration factor
PM_StepSlideMove( qtrue ); //< make this true to make gravity affect you
}
Ok,
this is the function that will control how you move while you are using
the jetpack. It is mostly a copy of the PM_FlyMove function with a couple
of changes. These changes are noted in the comments in the code above. Now
we also need to define the acceleration rate for the jetpack. This number
affects how quickly we accelerate in the direction we are jetting. This
variable is also in bg_pmove.c, but it's right up at the top. Search for
"pm_flyaccelerate" and add the following line right after
it. float pm_flyaccelerate = 8.0f; float pm_jetpackaccelerate = 5.0f; 3. SWITCHING IT ONNow we need to make sure that our function is called when it is time to fly. Once again we will be adding a couple of lines to bg_pmove.c. Search for "else if ( pm->ps->powerups[PW_FLIGHT] )". It is in the function PmoveSingle. This group of if/else's determines what function calculates the movement for the player. We want to add our own jetpack movement here, so add the lines below...if ( pm->ps->powerups[PW_FLIGHT] ) {
// flight powerup doesn't allow jump and has different friction
PM_FlyMove();
} else if ( pm->cmd.buttons & BUTTON_JETPACK ) {
PM_JetpackMove();
} else if (pm->ps->pm_flags & PMF_GRAPPLE_PULL) {
PM_GrappleMove();
// We can wiggle a bit
PM_AirMove();
} else if (pm->ps->pm_flags & PMF_TIME_WATERJUMP) {
PM_WaterJumpMove();
} else if ( pm->waterlevel > 1 ) {Basically, this
just says to call our own jetpack movement function whenever the jetpack
button is held down.
4. Using it...To use the jetpack you'll need to bind a key. The button I used for it is button 12 and I bound it to the second mouse button. To do that you'll need to type "bind mouse2 +button12". Now, whenever you hold down the right mouse button, your jetpack will propel you upwards. (Note: this jetpack works like the ones in Tribes. It will only propel you upwards while you are not also trying to jet forwards, backwards or sideways. This would be exceedingly easy to change, however, and will be left as an excercise for the reader.)4. Further enhancements...>From here, you could add sound and visual effects. You could implement a fuel/energy system to limit the amount of jettin' one can do. You could also play with the upward thrust and the acceleration values. Anyways, enjoy. Write me with any questions.Cletis |
