Random Spray Rifle Part 2 tutorial - Quake Game

Quake

id Software | Released Jun 19, 1996

Rage through 32 single player levels and 6 deathmatch levels of sheer terror and fully immersive sound and lighting. Arm yourself against the cannibalistic Ogre, fiendish Vore and indestructible Schambler using lethal nails, fierce Thunderbolts and abominable Rocket and Grenade Launchers.

Report article Random Spray Rifle Part 2

After doing your Counter-Strike-esque spray rifle, why not add movement based accuracy and ammo usage? Do this tutorial and add it in!

Posted by ChrisPage on Sep 5th, 2005 digg this super bookmark
Basic Client Side Coding.

[page=Introduction]
I'm assuming you've done Part 1 of this rifle tutorial, if you haven't this tutorial will not be implementable directly into your code without some optomizations

Lets begin!

[page=The Code]
open up weapons.qc again and find our code

 code:
v&#111;id&#40;&#41; W_Rifle =
{
  l&#111;cal  vect&#111;r s&#111;urce;
  l&#111;cal  vect&#111;r &#111;rg;
 
  makevect&#111;rs &#40;self.v_angle&#41;;
  s&#111;urce = self.&#111;rigin + &#39;0 0 16&#39;;
traceline &#40;s&#111;urce, s&#111;urce + v_f&#111;rward*3000 + v_right* 10 * rand&#111;m&#40;&#41; * 10 + v_up* 10 * 
rand&#111;m&#40;&#41; * 10 + v_right * -14, FALSE, self&#41;;
 
s&#111;und &#40;self, CHAN_WEAPON, &#34;weap&#111;ns/spike2.wav&#34;, 1, ATTN_NORM&#41;; 
//The super nailgun s&#111;und added t&#111; each sh&#111;t
  
  &#111;rg = trace_endp&#111;s - v_f&#111;rward*4;
 
  if &#40;trace_ent.takedamage&#41;
  {
  
    SpawnBl&#111;&#111;d &#40;&#111;rg, &#39;0 0 0&#39;, 20&#41;;
    T_Damage &#40;trace_ent, self, self, 20&#41;;
  }
  else
  { // hit wall
 
    WriteByte &#40;MSG_BROADCAST, SVC_TEMPENTITY&#41;;
    WriteByte &#40;MSG_BROADCAST, TE_SPIKE&#41;;
    WriteC&#111;&#111;rd &#40;MSG_BROADCAST, &#111;rg_x&#41;;
    WriteC&#111;&#111;rd &#40;MSG_BROADCAST, &#111;rg_y&#41;;
    WriteC&#111;&#111;rd &#40;MSG_BROADCAST, &#111;rg_z&#41;;
  }
};
 

We are now going to implement accuracy based on movement

Quote:void() W_Rifle =
{
local vector source;
local vector org;

makevectors (self.v_angle);
source = self.origin + '0 0 16';

if (!self.velocity_x || !self.velocity_y)
{
traceline (source, source + v_forward*3000 + v_right* 10 * random() * 10 + v_up* 10 *
random() * 10 + v_right * -14, FALSE, self);
}

if (self.velocity_x || self.velocity_y)
{
traceline (source, source + v_forward*3000 + v_right* 15 * random() * 14 + v_up* 17 *
random() * 16 + v_right * -20, FALSE, self);
}

sound (self, CHAN_WEAPON, "weapons/spike2.wav", 1, ATTN_NORM);
//The super nailgun sound added to each shot

org = trace_endpos - v_forward*4;

if (trace_ent.takedamage)
{

SpawnBlood (org, '0 0 0', 20);
T_Damage (trace_ent, self, self, 20);
}
else
{ // hit wall

WriteByte (MSG_BROADCAST, SVC_TEMPENTITY);
WriteByte (MSG_BROADCAST, TE_SPIKE);
WriteCoord (MSG_BROADCAST, org_x);
WriteCoord (MSG_BROADCAST, org_y);
WriteCoord (MSG_BROADCAST, org_z);
}
};

Now, to explain what we replaced the previous traceline function with

Quote:if (!self.velocity_x || !self.velocity_y)
{
traceline (source, source + v_forward*3000 + v_right* 10 * random() * 10 + v_up* 10 *
random() * 10 + v_right * -14, FALSE, self);
}

This was our previous traceline function, just within a if statement, basically it says in regular terms if the client (self) is not moving on the x or y axis (on the ground in any which way) use this traceline function and proceed on to what it hits and whether or not to deal out damage or just impact a wall.

Quote:if (self.velocity_x || self.velocity_y)
{
traceline (source, source + v_forward*3000 + v_right* 15 * random() * 14 + v_up* 17 *
random() * 16 + v_right * -20, FALSE, self);
}

This, very similar to the previous if statement states that if there is any form of movement (notice the lack of ! before each self.velocity) that the this traceline function should be used instead of the previous one. The difference in the traceline function is the numbers are generally greater and will cause a more inaccurate shot

Next, we want to implement it so it uses a shell still for each shot. Proceed to paste:

Quote:self.currentammo = self.ammo_shells = self.ammo_shells - 1;

right after:

Quote:org = trace_endpos - v_forward*4;

This will now make it similar to the default Quake1 shotgun of uses 1 ammo shell per shot. Simple enough right? Now save and compile your code and paste your progs.dat into your mod directory. Enjoy!

In conclusion, we have added to our previous rifle code movement specific accuracy and the use of an ammo shell per shot. Stay tuned for next tutorial'