Locational Damage tutorial

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How to add a simple locational damage code to Quake2. Imagine the possbilities with this code! A headshot can do 80 damage, 160 damage, or 1500 damage.. it's all your decision!!

Posted by Paril on Feb 5th, 2006 - Basic Server Side Coding

[page=Locational Damage for Quake2]
Hello! This is Paril here, with Paril's Mini Tutorials.

Down at Paril's Projects, as you know, AQC is in development, and well.. what's a realistic mod without being able to be hit in the head and dying one hit? Nothing!

Anyways, here's how we're going to do it.. (Also, please ignore the fact about the spacing.. it works fine in C++/Notepad)

Open up G_Combat.c..

find this:

qb&#111;&#111;lean CheckTeamDamage &#40;edict_t *targ, edict_t *attacker&#41;
{
		//FIXME make the next line real and unc&#111;mment this bl&#111;ck
		// if &#40;&#40;ability t&#111; damage a teammate == OFF&#41; && &#40;targ&#39;s team == attacker&#39;s team&#41;&#41;
	return false;
}

Right after this, copy-paste this entire code after that and before the T_Damage function:

//==============================================================
// AQC Scale damage am&#111;unt by l&#111;cati&#111;n &#111;f hit &#111;n player&#39;s b&#111;dy..
//==============================================================
#define Vect&#111;rEmpty&#40;a&#41;  &#40;&#40;a&#91;0&#93;==0&#41;&&&#40;a&#91;1&#93;==0&#41;&&&#40;a&#91;2&#93;==0&#41;&#41;
#define IsIn&#40;x,a,b&#41;     &#40;&#40;x&#41;&#62;=&#40;a&#41;&&&#40;x&#41;&#60;=&#40;b&#41;&#41;
#define LEG_DAMAGE     &#40;height/2.0&#41;-abs&#40;targ-&#62;mins&#91;2&#93;&#41;-3
#define STOMACH_DAMAGE &#40;height/1.6&#41;-abs&#40;targ-&#62;mins&#91;2&#93;&#41;
#define CHEST_DAMAGE   &#40;height/1.4&#41;-abs&#40;targ-&#62;mins&#91;2&#93;&#41;
#define NECK_DAMAGE    &#40;height/1.1&#41;-abs&#40;targ-&#62;mins&#91;2&#93;&#41;
#define HEAD_DAMAGE    &#40;height/0.7&#41;-abs&#40;targ-&#62;mins&#91;2&#93;&#41;
#define ARM1_DAMAGE    &#40;height/1.4&#41;-abs&#40;targ-&#62;mins&#91;8&#93;&#41;  // Sh&#111;uld g&#111; ab&#111;ut between the chest and st&#111;mach, and g&#111;ing &#111;ver by 8
#define ARM2_DAMAGE    &#40;height/1.4&#41;-abs&#40;targ-&#62;mins&#91;-8&#93;&#41; // Sh&#111;uld g&#111; ab&#111;ut between the chest and st&#111;mach, and g&#111;ing &#111;ver by -8

//==============================================================
fl&#111;at l&#111;cati&#111;n_scaling&#40;edict_t *targ, vec3_t p&#111;int, fl&#111;at damage, int m&#111;d&#41; {
fl&#111;at z_rel, height;
edict_t *ent;

  if &#40;&#33;&#40;targ-&#62;flags&FL_GODMODE&#41;&#41;
    if &#40;&#33;Vect&#111;rEmpty&#40;p&#111;int&#41;&#41;
      if &#40;IsIn&#40;m&#111;d, MOD_BLASTER, MOD_RAILGUN&#41;&#41; {
        height = abs&#40;targ-&#62;mins&#91;2&#93;&#41;+targ-&#62;maxs&#91;2&#93;;
        z_rel = p&#111;int&#91;2&#93;-targ-&#62;s.&#111;rigin&#91;2&#93;;
        if &#40;z_rel &#60; LEG_DAMAGE&#41;
          return 0.35;  // Scale d&#111;wn by 2/3
        else
        if &#40;z_rel &#60; STOMACH_DAMAGE&#41;
          return 0.66;  // Scale d&#111;wn by 1/3
        else
        if &#40;z_rel &#60; CHEST_DAMAGE&#41;
            return 1.20;  // Scale up by 1/5
		if &#40;z_rel &#60; NECK_DAMAGE&#41;
		  return 3.00;  // Scale up by 3X &#40;C&#111;me &#111;n, a neck sh&#111;t atleast has t&#111; kill&#59;&#41; &#41;
		if &#40;z_rel &#60; HEAD_DAMAGE&#41;
		  return 8.00;  // Scale up by 8X &#40;Pretty much dead...&#41;
 		if &#40;z_rel &#60; ARM1_DAMAGE&#41;
		  return .66;  // Scale d&#111;wn by 1/3
 		if &#40;z_rel &#60; ARM2_DAMAGE&#41;
		  return .66;  // Scale d&#111;wn by 1/3

		else
          return 1.0;} // N&#111;rmal Damage if hit anywhere else

  return 1.0; // keep damage the same..

}
//-----------------------------------------------------------

Now go down further, and find this line in your T_Damage function:

// friendly fire av&#111;idance
// if enabled y&#111;u can&#39;t hurt teammates &#40;but y&#111;u can hurt y&#111;urself&#41;
// kn&#111;ckback still &#111;ccurs
	if &#40;&#40;targ &#33;= attacker&#41; && &#40;&#40;deathmatch-&#62;value && &#40;&#40;int&#41;&#40;dmflags-&#62;value&#41; & &#40;DF_MODELTEAMS &#124; DF_SKINTEAMS&#41;&#41;&#41; &#124;&#124; c&#111;&#111;p-&#62;value&#41;&#41;
	{
		if &#40;OnSameTeam &#40;targ, attacker&#41;&#41;
		{
			if &#40;&#40;int&#41;&#40;dmflags-&#62;value&#41; & DF_NO_FRIENDLY_FIRE&#41;
				damage = 0;
			else
				m&#111;d &#124;= MOD_FRIENDLY_FIRE;
		}
	}

Right above that, add:

//-----------------------------------
//AQC  Scale damage by hit l&#111;cati&#111;n &#40;leg,st&#111;mach,chest,head&#41;..
  damage *= l&#111;cati&#111;n_scaling&#40;targ, p&#111;int, damage, m&#111;d&#41;;
//------------------------------------

There you go! A simple, yet effective way to implement a very good realistic feature.

Paril

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Author

Paril - Feb 5 2006 - 24 comments

Many many things you could do with this. Maybe some text like in Action "You hit %s in the (name of part)!", Kevlar/Armor bullet hitting "%s's Kevlar Vest absorbed most of the shot".. this can be used for every weapon, including melee attacks.

Reply Good karma+1 vote

Paril - Jul 13 2006 - 24 comments

Note, I messed up,
Try this:

#define ARM1_DAMAGE (height/1.4)-abs(targ->mins)+8 // Should go about between the chest and stomach, and going over by 8#define ARM2_DAMAGE (height/1.4)-abs(targ->mins)-8 // Should go about between the chest and stomach, and going over by -8