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Bots hear footsteps/cloaking player sounds #2022

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9 changes: 8 additions & 1 deletion src/game/server/neo/bot/behavior/neo_bot_seek_and_destroy.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -41,7 +41,7 @@ CSound* CNEOBotSeekAndDestroy::SearchGunfireSounds(CNEOBot* me, const Vector* cu
break;
}

if (!(pSound->SoundType() & SOUND_COMBAT))
if (!(pSound->SoundType() & (SOUND_COMBAT | SOUND_PLAYER)))

@sunzenshen sunzenshen Jul 26, 2026

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Looking for feedback on whether it makes sense to use the SOUND_PLAYER flag in this way, or if it's cleaner to treat footsteps as a SOUND_COMBAT

{
continue;
}
Expand All @@ -63,6 +63,13 @@ CSound* CNEOBotSeekAndDestroy::SearchGunfireSounds(CNEOBot* me, const Vector* cu
// Search for the closest gunfire sounds
float distSqr = vecMyOrigin.DistToSqr(pSound->GetSoundOrigin());

// Only consider sounds within hearing range
float hearingRangeSqr = Square((float)pSound->m_iVolume);
if (distSqr > hearingRangeSqr)
{
continue;
}

// Only consider sounds that are closer than the current goal
if (distSqr >= flGoalDistSqr)
{
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5 changes: 5 additions & 0 deletions src/game/server/neo/neo_player.cpp
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Expand Up @@ -1243,6 +1243,9 @@ void CNEO_Player::PlayCloakSound(bool removeLocalPlayer)
// effect lasts 0.5 seconds, but allow 200-300ms leeway with GetFogObscuredRatio cache window
m_botThermOpticCamoDisruptedTimer.Start(0.2f);
}

// For bots to notice cloak sound
CSoundEnt::InsertSound(SOUND_COMBAT, GetAbsOrigin(), SOUNDENT_VOLUME_CLOAK, 0.5, this);
}

void CNEO_Player::SetCloakState(bool state)
Expand Down Expand Up @@ -3002,6 +3005,8 @@ void CNEO_Player::PlayStepSound( Vector &vecOrigin,
surfacedata_t *psurface, float fvol, bool force )
{
BaseClass::PlayStepSound(vecOrigin, psurface, fvol, force);
// For bots to hear footsteps
CSoundEnt::InsertSound(SOUND_PLAYER | SOUND_COMBAT, GetAbsOrigin(), SOUNDENT_VOLUME_FOOTSTEP, 0.1, this);
}

bool CNEO_Player::IsCarryingGhost(void) const
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22 changes: 22 additions & 0 deletions src/game/server/soundent.h
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Expand Up @@ -90,6 +90,28 @@ enum
#define SOUNDENT_VOLUME_PISTOL 1500.0
#define SOUNDENT_VOLUME_EMPTY 500.0 // volume of the "CLICK" when you have no bullets

#ifdef NEO
// Bot hearing distances for CSoundEnt::InsertSound()
// Despite the name, iVolume is commonly used as an AI hearing radius (in Hammer units).
// While this is separate from client sound playback attenuation (CPASAttenuationFilter),
// we use that system for reference of relative detection differences.
//
// BASELINE FROM EXISTING SOUNDENT_VOLUME_EMPTY VALUE:
// weapon_milso.empty: SNDLVL_NORM (75dB), vol 1.0 [game_sounds_weapons.txt]
// Client hearing: (2 * SOUND_NORMAL_CLIP_DIST) / SNDLVL_TO_ATTN(75) = (2*10000)/0.8 = 25000 units
// AI value: SOUNDENT_VOLUME_EMPTY = 500.0
// AI-to-client ratio: 500 / 25000 = 0.02
//
// Footsteps (StepLeft/StepRight): SNDLVL_75dB, vol 1.0 [game_sounds_physics.txt]
// Client hearing: (2*10000)/0.8 * 1.0 = 25000 units
// Mathematical AI value: 25000 * 0.02 = 500 units
#define SOUNDENT_VOLUME_FOOTSTEP 500
// Cloak (ThermOpticOn/Off): SNDLVL_75dB, vol 0.7 [game_sounds_player.txt]
// Client hearing: (2*10000)/0.8 * 0.7 = 17500 units
// Mathematical AI value: 17500 * 0.02 = 350 units
#define SOUNDENT_VOLUME_CLOAK 350
#endif

@sunzenshen sunzenshen Jul 26, 2026

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I wasn't sure what to input for CSoundEnt::InsertSound as the volume parameter, so I estimated a rough scale based on the existing shotgun volume used elsewhere.


enum
{
SOUND_PRIORITY_VERY_LOW = -2,
Expand Down