Rocket Jumping Hack!
More Jump! No Damage! Halaluya!

This tutorial will;
a) remove self damage for rocket explosions, and
b) allow you to jump higher.

Remember to add in the blue code.
We only need to add 4 lines to g_combat.c in T_Damage procedure:

void T_Damage (edict_t *targ, edict_t *inflictor, edict_t *attacker, vec3_t dir, vec3_t point, vec3_t normal, int damage, int knockback, int dflags, int mod)
{
gclient_t *client;
int take;
int save;
int asave;
int psave;
int te_sparks;

if (!targ->takedamage)
return;

if ((mod = MOD_R_SPLASH) && (targ == attacker))
{
damage = 0; // No Damage
knockback *= 1.2; // Rocket Jumping Jump Height * 1.2
}

// friendly fire avoidance
// if enabled you can't hurt teammates (but you can hurt yourself)
// knockback still occurs
...

};

Tutorial by [L]arou[X]
Quake Style - Tutorials