//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
void CASW_PropJeep::DampenForwardMotion( Vector &vecVehicleEyePos, QAngle &vecVehicleEyeAngles, float flFrameTime )
{
// Get forward vector.
Vector vecForward;
AngleVectors( vecVehicleEyeAngles, &vecForward);
// Simulate the eye position forward based on the data from last frame
// (assumes no acceleration - it will get that from the "spring").
Vector vecCurrentEyePos = m_vecLastEyePos + m_vecEyeSpeed * flFrameTime;
// Calculate target speed based on the current vehicle eye position and the last vehicle eye position and frametime.
Vector vecVehicleEyeSpeed = ( vecVehicleEyePos - m_vecLastEyeTarget ) / flFrameTime;
m_vecLastEyeTarget = vecVehicleEyePos;
// Calculate the speed and position deltas.
Vector vecDeltaSpeed = vecVehicleEyeSpeed - m_vecEyeSpeed;
Vector vecDeltaPos = vecVehicleEyePos - vecCurrentEyePos;
// Clamp.
if ( vecDeltaPos.Length() > JEEP_DELTA_LENGTH_MAX )
{
float flSign = vecForward.Dot( vecVehicleEyeSpeed ) >= 0.0f ? -1.0f : 1.0f;
vecVehicleEyePos += flSign * ( vecForward * JEEP_DELTA_LENGTH_MAX );
m_vecLastEyePos = vecVehicleEyePos;
m_vecEyeSpeed = vecVehicleEyeSpeed;
return;
}
// Generate an updated (dampening) speed for use in next frames position extrapolation.
float flCoefficients[2];
ComputePDControllerCoefficients( flCoefficients, r_JeepViewDampenFreq.GetFloat(), r_JeepViewDampenDamp.GetFloat(), flFrameTime );
m_vecEyeSpeed += ( ( flCoefficients[0] * vecDeltaPos + flCoefficients[1] * vecDeltaSpeed ) * flFrameTime );
// Save off data for next frame.
m_vecLastEyePos = vecCurrentEyePos;
// Move eye forward/backward.
Vector vecForwardOffset = vecForward * ( vecForward.Dot( vecDeltaPos ) );
vecVehicleEyePos -= vecForwardOffset;
}
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
void C_PropJeep::DampenForwardMotion( Vector &vecVehicleEyePos, QAngle &vecVehicleEyeAngles, float flFrameTime )
{
// vecVehicleEyePos = real eye position this frame
// m_vecLastEyePos = eye position last frame
// m_vecEyeSpeed = eye speed last frame
// vecPredEyePos = predicted eye position this frame (assuming no acceleration - it will get that from the pd controller).
// vecPredEyeSpeed = predicted eye speed
Vector vecPredEyePos = m_vecLastEyePos + m_vecEyeSpeed * flFrameTime;
Vector vecPredEyeSpeed = m_vecEyeSpeed;
// m_vecLastEyeTarget = real eye position last frame (used for speed calculation).
// Calculate the approximate speed based on the current vehicle eye position and the eye position last frame.
Vector vecVehicleEyeSpeed = ( vecVehicleEyePos - m_vecLastEyeTarget ) / flFrameTime;
m_vecLastEyeTarget = vecVehicleEyePos;
if (vecVehicleEyeSpeed.Length() == 0.0)
return;
// Calculate the delta between the predicted eye position and speed and the current eye position and speed.
Vector vecDeltaSpeed = vecVehicleEyeSpeed - vecPredEyeSpeed;
Vector vecDeltaPos = vecVehicleEyePos - vecPredEyePos;
// Forward vector.
Vector vecForward;
AngleVectors( vecVehicleEyeAngles, &vecForward );
float flDeltaLength = vecDeltaPos.Length();
if ( flDeltaLength > JEEP_DELTA_LENGTH_MAX )
{
// Clamp.
float flDelta = flDeltaLength - JEEP_DELTA_LENGTH_MAX;
if ( flDelta > 40.0f )
{
// This part is a bit of a hack to get rid of large deltas (at level load, etc.).
m_vecLastEyePos = vecVehicleEyePos;
m_vecEyeSpeed = vecVehicleEyeSpeed;
}
else
{
// Position clamp.
float flRatio = JEEP_DELTA_LENGTH_MAX / flDeltaLength;
vecDeltaPos *= flRatio;
Vector vecForwardOffset = vecForward * ( vecForward.Dot( vecDeltaPos ) );
vecVehicleEyePos -= vecForwardOffset;
m_vecLastEyePos = vecVehicleEyePos;
// Speed clamp.
vecDeltaSpeed *= flRatio;
float flCoefficients[2];
ComputePDControllerCoefficients( flCoefficients, r_JeepViewDampenFreq.GetFloat(), r_JeepViewDampenDamp.GetFloat(), flFrameTime );
m_vecEyeSpeed += ( ( flCoefficients[0] * vecDeltaPos + flCoefficients[1] * vecDeltaSpeed ) * flFrameTime );
}
}
else
{
// Generate an updated (dampening) speed for use in next frames position prediction.
float flCoefficients[2];
ComputePDControllerCoefficients( flCoefficients, r_JeepViewDampenFreq.GetFloat(), r_JeepViewDampenDamp.GetFloat(), flFrameTime );
m_vecEyeSpeed += ( ( flCoefficients[0] * vecDeltaPos + flCoefficients[1] * vecDeltaSpeed ) * flFrameTime );
// Save off data for next frame.
m_vecLastEyePos = vecPredEyePos;
// Move eye forward/backward.
Vector vecForwardOffset = vecForward * ( vecForward.Dot( vecDeltaPos ) );
vecVehicleEyePos -= vecForwardOffset;
}
}