Distance between 2 entities?

[Ghost_Fang]

I think this might be a dumb question. I think I found it by looking in the ogre code but im not sure.
I wanna add code to a bot that will add melee.
something like this: (not the real code)

Code: Select all

if (the distance between self and target < 64)
     {
      melee();
     }
    else
    {
    bot_shoot();
    }

I don't know how to detect distance. I tried something and all they did was try to run up to you just to melee. I want them to shoot at you and if you happen to be close enough, they might punch you.

[Wazat]

No problem.

Code: Select all

dist = vlen(enemy.origin - self.origin);


vlen (vector length) will give you the length of any vector. Directional vectors (used for aiming) have a length of 1 by definition. Vector length can also be used to get the speed when used on a velocity.

Subtracting your bot's position from his enemy's position creates a weighted vector whose length is the distance between them. That gives us something to use vlen on.

[Ghost_Fang]

so it should look like this?

Code: Select all

local vector dist;

dist = vlen(enemy.origin - self.origin);

if (vlen < 64)
   {
   melee();
   }
   else
   {
   bot_shoot();
   }

[Wazat]

Looks about right.

[Ghost_Fang]

Ill try it out and see what i get.

[Sajt]

so it should look like this?

Code: Select all

local vector dist;

dist = vlen(enemy.origin - self.origin);

if (vlen < 64)
   {
   melee();
   }
   else
   {
   bot_shoot();
   }

if (vlen < 64)

should be

if (dist < 64)

[frag.machine]

You could also use the provided range() function, that basically wraps the vlen code provided by Wazat and returns some constants:

Code: Select all

local float dist;

dist = range(self.enemy);

if (range == RANGE_MELEE) // constants in defs.qc
{
  bot_melee ();
}
else
{
  bot_shoot ();
}


[Ghost_Fang]

Ohh. Well i got it working anyhow. I had to switch a couple things. This is what it ends up looking like (its a frikbot addon).

Code: Select all

if ( (random () < 0.002) )
         {
         bot_frag1();
         }         
         else if (dist < 80)
         {
            if ( (random () < 0.05) )
            {
            bot_melee1();
            }
         }
         else
         {
         bot_shoot();
         }