.:: Bots United ::. - Detecting fall damage in a safe way?

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- - Detecting fall damage in a safe way? (http://forums.bots-united.com/showthread.php?t=338)

Detecting fall damage in a safe way?

I am trying to figure out how to get a 100% solid method to know a bot recieved damage due falling. This is to let bots learn from their mistakes in some nodes.

I tried using the DMG_FALL and DMG_CRUSS bits, but they gave me no luck! I saw in the SDK only bits gets sent that require a HUD drawing on the client, this stinks!

My code:

Code:

// This message gets sent when the bots are getting damaged.

void BotClient_Valve_Damage(void *p, int bot_index)

{

 //DebugOut("bot_client: BotClient_Valve_Damage()\n");

   static int state = 0;   // current state machine state

   static int damage_armor;

   static int damage_taken;

   static int damage_bits;  // type of damage being done

   static Vector damage_origin;

   if (state == 0)

   {

          state++;

          damage_armor = *(int *)p;

   }

   else if (state == 1)

   {

          state++;

          damage_taken = *(int *)p;

   }

   else if (state == 2)

   {

          state++;

          damage_bits = *(int *)p;

   }

   else if (state == 3)

   {

          state++;

          damage_origin.x = *(float *)p;

   }

   else if (state == 4)

   {

          state++;

          damage_origin.y = *(float *)p;

   }

   else if (state == 5)

   {

          state = 0;

          damage_origin.z = *(float *)p;

          if ((damage_armor > 0) || (damage_taken > 0))

          {

                  // Damage recieved:

                  // - when the prev node was higher (so we are sure we do FIX the correct nodes!)

                  //   we fix it (only when dist > 90)

                  cBot *pBot = &bots[bot_index];

   

                  if ((damage_bits & (DMG_FALL | DMG_CRUSH))

                  {                                          

                          LOG_CONSOLE (PLID, "realbot - fixed connection with falling.");                          

                          LOG_MESSAGE (PLID, "realbot - fixed connection with falling.");

                          if (pBot->bot_pathid > 0)

                          {

                                  int iNode = NodeMachine.NodeFromPath(pBot->iIndex, (pBot->bot_pathid-1));

                                  float fDist = fabs(damage_origin.z - NodeMachine.node_vector(iNode).z);

                                  if (fDist > 90)

                                  {

                                          // we know where we came from, and we know where we went to

                                          int iNodeTo = NodeMachine.NodeFromPath(pBot->iIndex, pBot->bot_pathid);

                                          // remove connection

                                          NodeMachine.remove_neighbour_node(iNode, iNodeTo);

                                  }

                          }

                  }

                 // ignore certain types of damage...

                 if (damage_bits & IGNORE_DAMAGE)

                        return;

                 // if the bot doesn't have an enemy and someone is shooting at it then

                 // turn in the attacker's direction...

                 if (bots[bot_index].pBotEnemy == NULL)

                 {

                        // face the attacker... (yeah yeah, cheating for now ;) )

   // Face danger vector

          pBot->vHead = damage_origin;

                        pBot->vBody = damage_origin;

                        

                        // move to damage vector

                        pBot->f_camp_time = gpGlobals->time; // stop camping

                        pBot->iGoalNode = NodeMachine.close(damage_origin, 150, NULL);

                        pBot->bot_pathid = -1;

   ///////////// END STEFAN

                 }

          }

   }

}

Code from sdk (player.cpp, function "UpdateClientdata"),

Code:

if (pev->dmg_take || pev->dmg_save || m_bitsHUDDamage != m_bitsDamageType)

 {

  // Comes from inside me if not set

  Vector damageOrigin = pev->origin;

  // send "damage" message

  // causes screen to flash, and pain compass to show direction of damage

  edict_t *other = pev->dmg_inflictor;

  if ( other )

  {

   CBaseEntity *pEntity = CBaseEntity::Instance(other);

   if ( pEntity )

        damageOrigin = pEntity->Center();

  }

  // only send down damage type that have hud art

  int visibleDamageBits = m_bitsDamageType & DMG_SHOWNHUD;

  MESSAGE_BEGIN( MSG_ONE, gmsgDamage, NULL, pev );

   WRITE_BYTE( pev->dmg_save );

   WRITE_BYTE( pev->dmg_take );

   WRITE_LONG( visibleDamageBits );

   WRITE_COORD( damageOrigin.x );

   WRITE_COORD( damageOrigin.y );

   WRITE_COORD( damageOrigin.z );

  MESSAGE_END();

 

  pev->dmg_take = 0;

  pev->dmg_save = 0;

  m_bitsHUDDamage = m_bitsDamageType;

  

  // Clear off non-time-based damage indicators

  m_bitsDamageType &= DMG_TIMEBASED;

 }

Re: Detecting fall damage in a safe way?

The IGNORE_DAMAGE bits don't work in Counter-Strike.

Do this instead

Code:

// is this player falling fast enough to get some damage ?

if (pEdict->v.flFallVelocity > PLAYER_MAX_SAFE_FALL_SPEED)

look in the SDK's player.h:

Code:

#define PLAYER_FATAL_FALL_SPEED 1024// approx 60 feet

#define PLAYER_MAX_SAFE_FALL_SPEED 580// approx 20 feet

Re: Detecting fall damage in a safe way?

I have a similar problem. How to detect if a bot is getting damage from being attacked, and who the attacker is. I tried using the "Damage" message, but it does not indicate what the cause of the damage is, or who (or what) is the source. I ended up doing a traceline back to the source origin to see what it is, but the method is cpu intensive and inaccurate.

Re: Detecting fall damage in a safe way?

lol, I feel like I'm your savior for each problem you have :D

botmeister: already checked: pEdict->v.dmg_inflictor ?

:)

Re: Detecting fall damage in a safe way?

Quote:

Originally Posted by Pierre-Marie Baty

lol, I feel like I'm your savior for each problem you have :D

botmeister: already checked: pEdict->v.dmg_inflictor ?

:)

THANKS! :D

How in the hell do you find this stuff anyway? ???:(

Re: Detecting fall damage in a safe way?

the hell you're talking about is called "PMTools plugin", and it's available for download with source code on my site, hehe :P

Re: Detecting fall damage in a safe way?

BTW: Whether function UpdateClientData in dll.cpp is necessary? Count Floyd spoke, that she is not necessary.

Re: Detecting fall damage in a safe way?

It is not necessary. You can delete it.

This function is used by clients to ask the server to send a network message containing various data about the client, so that the client can update itself and synchronize with the server. It would be useful for a client-side bot. But since your bot is a server-side bot, all the data concerning your bots is available through pBot->pEdict, and you don't need to ask the server to send you anything because you use the same structures as the server.

Re: Detecting fall damage in a safe way?

UpdateClientData is only used in the bot code to find out if the bots weapons have been changed and it's weapons haven't been updated yet. You only need to use it if a bot drops its weapon, as it doesnt get removed from the bots weapons bitmask (but it does in the pev->weapons bitmask).

UpdateClientData uses some cpu I think, so I just replaced it by checking pev->weapons instead of cd.weapons that comes from UpdateClientData.

Re: Detecting fall damage in a safe way?

thanks guys, i think i can work with this stuff! :D

Re: Detecting fall damage in a safe way?

One quick question, if you base damage estimate solely on fall speed, then won't the bot fear jumping long distances into water, like the bridge in de_aztec? Falling into water doesn't hurt like falling on to a solid surface. Or am I just being a pain in the butt?

Re: Detecting fall damage in a safe way?

WHOA, I stand corrected. Indeed. Here's a bug. A lovely bug man !!

Well I suppose we'll need to add another check

Code:

// pseudocode

IF ((the bot WAS falling fast enough to get some damage)

        AND (the bot JUST received damage from worldspawn))

   THEN it's a dangerous fall

Thanks a lot !!! :D

Re: Detecting fall damage in a safe way?

In real life, I am a programmer of database applications using Visual Basic and Microsoft Access. But I suck at C/C++, so I will leave the actual coding to the experts. But this bot stuff is interesting to me from an algorithmic perspective.

Re: Detecting fall damage in a safe way?

Quote:

Originally Posted by A$$A$$IN

Welcome to Bots United fellow database programmer! :D

I've also been doing database programming using MS Access and SQL databases. If you dig into C++ while playing around with something that's fun to do (like bot programming), you'll learn fast.

btw, I thought this was real life o_O ?

Re: Detecting fall damage in a safe way?

If this was real life, wouldn't you be building Terminators? :)

Re: Detecting fall damage in a safe way?

Sarah... Connor ?

:D

Re: Detecting fall damage in a safe way?

- No, try the next door...
- Sarah Connor?
- yes?
- (pmmm) (pmmm)

(lol, french reference... sry.. PMB should understand)