Update car-follow free cam

Added frameTime variable to Process_FollowCar_SA, and update references to GetTimeStepFix() to instead use frameTime.
Fixes a crash that happens when pausing and unpausing with the timestepfix adjusted freecam active

src/core/Cam.cpp

@@ -4878,6 +4878,7 @@ CCam::Process_FollowCar_SA(const CVector& CameraTarget, float TargetOrientation,
 	}
 
 	float nextDistance = Max(newDistance, minDistForVehType);
+	static float frameTime = CTimer::GetTimeStepFix();
 
 	CA_MAX_DISTANCE = newDistance;
 	CA_MIN_DISTANCE = 3.5f;
@@ -4892,12 +4893,12 @@ CCam::Process_FollowCar_SA(const CVector& CameraTarget, float TargetOrientation,
 		if (isCar || isBike) {
 			// 0.4f: CAR_FOV_START_SPEED
 			if (DotProduct(car->GetForward(), car->m_vecMoveSpeed) > 0.4f)
-				FOV += (DotProduct(car->GetForward(), car->m_vecMoveSpeed) - 0.4f) * (CTimer::GetTimeStep() / CTimer::GetTimeStepFix());
+				FOV += (DotProduct(car->GetForward(), car->m_vecMoveSpeed) - 0.4f) * (CTimer::GetTimeStep() / frameTime);
 		}
 
 		if (FOV > DefaultFOV)
 			// 0.98f: CAR_FOV_FADE_MULT
-			FOV = Pow(0.98f, CTimer::GetTimeStep() / CTimer::GetTimeStepFix()) * (FOV - DefaultFOV) + DefaultFOV;
+			FOV = Pow(0.98f, CTimer::GetTimeStep() / frameTime) * (FOV - DefaultFOV) + DefaultFOV;
 
 		FOV = Clamp(FOV, DefaultFOV, DefaultFOV + 30.0f);
 	}
@@ -4965,8 +4966,8 @@ CCam::Process_FollowCar_SA(const CVector& CameraTarget, float TargetOrientation,
 	else if (velocityRightHeading > camRightHeading + PI)
 		velocityRightHeading = velocityRightHeading - TWOPI;
 
-	float betaChangeMult1 = (CTimer::GetTimeStep() / CTimer::GetTimeStepFix()) * CARCAM_SET[camSetArrPos][10];
-	float betaChangeLimit = (CTimer::GetTimeStep() / CTimer::GetTimeStepFix()) * CARCAM_SET[camSetArrPos][11];
+	float betaChangeMult1 = (CTimer::GetTimeStep() / frameTime) * CARCAM_SET[camSetArrPos][10];
+	float betaChangeLimit = (CTimer::GetTimeStep() / frameTime) * CARCAM_SET[camSetArrPos][11];
 
 	float betaChangeMult2 = (car->m_vecMoveSpeed - DotProduct(car->m_vecMoveSpeed, Front) * Front).Magnitude();
 
@@ -5028,8 +5029,8 @@ CCam::Process_FollowCar_SA(const CVector& CameraTarget, float TargetOrientation,
 	} else {
 		targetAlpha = maxAlphaAllowed;
 	}
-	float maxAlphaBlendAmount = (CTimer::GetTimeStep() / CTimer::GetTimeStepFix()) * CARCAM_SET[camSetArrPos][6];
-	float targetAlphaBlendAmount = (1.0f - Pow(CARCAM_SET[camSetArrPos][5], CTimer::GetTimeStep() / CTimer::GetTimeStepFix())) * (targetAlpha - Alpha);
+	float maxAlphaBlendAmount = (CTimer::GetTimeStep() / frameTime) * CARCAM_SET[camSetArrPos][6];
+	float targetAlphaBlendAmount = (1.0f - Pow(CARCAM_SET[camSetArrPos][5], (CTimer::GetTimeStep() / frameTime))) * (targetAlpha - Alpha);
 	if (targetAlphaBlendAmount <= maxAlphaBlendAmount) {
 		if (targetAlphaBlendAmount < -maxAlphaBlendAmount)
 			targetAlphaBlendAmount = -maxAlphaBlendAmount;
@@ -5125,7 +5126,7 @@ CCam::Process_FollowCar_SA(const CVector& CameraTarget, float TargetOrientation,
 	float betaSpeedFromStickX = xMovement * CARCAM_SET[camSetArrPos][12];
 
 	float newAngleSpeedMaxBlendAmount = CARCAM_SET[camSetArrPos][9];
-	float angleChangeStep = Pow(CARCAM_SET[camSetArrPos][8], CTimer::GetTimeStepFix());
+	float angleChangeStep = Pow(CARCAM_SET[camSetArrPos][8], frameTime);
 	float targetBetaWithStickBlendAmount = betaSpeedFromStickX + (targetBeta - Beta) / Max(CTimer::GetTimeStep(), 1.0f);
 
 	if (targetBetaWithStickBlendAmount < -newAngleSpeedMaxBlendAmount)
@@ -5135,7 +5136,7 @@ CCam::Process_FollowCar_SA(const CVector& CameraTarget, float TargetOrientation,
 
 	float angleChangeStepLeft = 1.0f - angleChangeStep;
 	BetaSpeed = targetBetaWithStickBlendAmount * angleChangeStepLeft + angleChangeStep * BetaSpeed;
-	if (Abs(BetaSpeed) < 0.0001f * CTimer::GetTimeStepFix())
+	if (Abs(BetaSpeed) < 0.0001f * frameTime)
 		BetaSpeed = 0.0f;
 
 	float betaChangePerFrame;
@@ -5176,7 +5177,7 @@ CCam::Process_FollowCar_SA(const CVector& CameraTarget, float TargetOrientation,
 		AlphaSpeed = maxAlphaSpeed;
 	}
 
-	if (Abs(AlphaSpeed) < 0.0001f * CTimer::GetTimeStepFix())
+	if (Abs(AlphaSpeed) < 0.0001f * frameTime)
 		AlphaSpeed = 0.0f;
 
 		float alphaWithSpeedAccounted;
@@ -5200,12 +5201,12 @@ CCam::Process_FollowCar_SA(const CVector& CameraTarget, float TargetOrientation,
 	}
 
 	// Prevent unsignificant angle changes
-	if (Abs(lastAlpha - Alpha) < 0.0001f * CTimer::GetTimeStepFix())
+	if (Abs(lastAlpha - Alpha) < 0.0001f * frameTime)
 		Alpha = lastAlpha;
 
 	lastAlpha = Alpha;
 
-	if (Abs(lastBeta - Beta) < 0.0001f * CTimer::GetTimeStepFix())
+	if (Abs(lastBeta - Beta) < 0.0001f * frameTime)
 		Beta = lastBeta;
 
 	lastBeta = Beta;