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Fall Damage Formula


  
 
 
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ConnorMcLeod
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Join Date: Jul 2006
Location: France (95)
Old 01-04-2010 , 12:41   Fall Damage Formula
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Useless stuff, but someone may be interested...

cstrike values (should be the sames for czero)
Code:
#define PLAYER_FATAL_FALL_SPEED 980.0
#define PLAYER_MAX_SAFE_FALL_SPEED 500.0
#define PLAYER_FALL_PUNCH_THRESHHOLD 250.0 // found by arkshine
player.h (those are half life default values)
Code:
#define PLAYER_FATAL_FALL_SPEED		1024// approx 60 feet
#define PLAYER_MAX_SAFE_FALL_SPEED	580// approx 20 feet
#define DAMAGE_FOR_FALL_SPEED		(float) 100 / ( PLAYER_FATAL_FALL_SPEED - PLAYER_MAX_SAFE_FALL_SPEED )// damage per unit per second.
#define PLAYER_MIN_BOUNCE_SPEED		200
#define PLAYER_FALL_PUNCH_THRESHHOLD (float)350 // won't punch player's screen/make scrape noise unless player falling at least this fast.
multiplay_gamerules.cpp
Code:
float CHalfLifeMultiplay :: FlPlayerFallDamage( CBasePlayer *pPlayer )
{
	int iFallDamage = (int)falldamage.value;

	switch ( iFallDamage )
	{
	case 1://progressive
		pPlayer->m_flFallVelocity -= PLAYER_MAX_SAFE_FALL_SPEED;
		return pPlayer->m_flFallVelocity * DAMAGE_FOR_FALL_SPEED;
		break;
	default:
	case 0:// fixed
		return 10;
		break;
	}
}
player.cpp
Code:
void CBasePlayer::PostThink()
{
// [...]

// check to see if player landed hard enough to make a sound
// falling farther than half of the maximum safe distance, but not as far a max safe distance will
// play a bootscrape sound, and no damage will be inflicted. Fallling a distance shorter than half
// of maximum safe distance will make no sound. Falling farther than max safe distance will play a 
// fallpain sound, and damage will be inflicted based on how far the player fell

	if ( (FBitSet(pev->flags, FL_ONGROUND)) && (pev->health > 0) && m_flFallVelocity >= PLAYER_FALL_PUNCH_THRESHHOLD )
	{
		// ALERT ( at_console, "%f\n", m_flFallVelocity );

		if (pev->watertype == CONTENT_WATER)
		{
			// Did he hit the world or a non-moving entity?
			// BUG - this happens all the time in water, especially when 
			// BUG - water has current force
			// if ( !pev->groundentity || VARS(pev->groundentity)->velocity.z == 0 )
				// EMIT_SOUND(ENT(pev), CHAN_BODY, "player/pl_wade1.wav", 1, ATTN_NORM);
		}
		else if ( m_flFallVelocity > PLAYER_MAX_SAFE_FALL_SPEED )
		{// after this point, we start doing damage
			
			float flFallDamage = g_pGameRules->FlPlayerFallDamage( this );

			if ( flFallDamage > pev->health )
			{//splat
				// note: play on item channel because we play footstep landing on body channel
				EMIT_SOUND(ENT(pev), CHAN_ITEM, "common/bodysplat.wav", 1, ATTN_NORM);
			}

			if ( flFallDamage > 0 )
			{
				TakeDamage(VARS(eoNullEntity), VARS(eoNullEntity), flFallDamage, DMG_FALL ); 
				pev->punchangle.x = 0;
			}
		}

		if ( IsAlive() )
		{
			SetAnimation( PLAYER_WALK );
		}
    }

	if (FBitSet(pev->flags, FL_ONGROUND))
	{		
		if (m_flFallVelocity > 64 && !g_pGameRules->IsMultiplayer())
		{
			CSoundEnt::InsertSound ( bits_SOUND_PLAYER, pev->origin, m_flFallVelocity, 0.2 );
			// ALERT( at_console, "fall %f\n", m_flFallVelocity );
		}
		m_flFallVelocity = 0;
	}
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Last edited by ConnorMcLeod; 02-25-2012 at 18:26.
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