33 lines
956 B
C++
33 lines
956 B
C++
// Copyright 2016 Mookie. All Rights Reserved.
|
|
|
|
#include "EBBullet.h"
|
|
|
|
FVector AEBBullet::UpdateVelocity_Implementation(UWorld* World, FVector Location, FVector PreviousVelocity, float DeltaTime) const {
|
|
FVector NewVelocity = PreviousVelocity;
|
|
|
|
//airDensity
|
|
float air;
|
|
float speedOfSound;
|
|
|
|
air = GetAirDensity(World, Location);
|
|
speedOfSound = GetSpeedOfSound(World, Location);
|
|
|
|
//gravity
|
|
if (!OverrideGravity) {
|
|
NewVelocity += FVector(0, 0, World->GetGravityZ())*DeltaTime;
|
|
}
|
|
else {
|
|
NewVelocity += Gravity*DeltaTime;
|
|
};
|
|
|
|
//drag
|
|
FVector relVel = (NewVelocity - GetWind(World, Location));
|
|
float speed = relVel.Size();
|
|
float mach = speed / speedOfSound;
|
|
float profile = FMath::Pow(Diameter / 200.0f, 2.0f)*3.141592f;
|
|
float drag = GetCurveValue(MachDragCurve, mach, 0.25f)*FMath::Pow(speed / 100.0f, 2.0f)*profile*air*FormFactor*50.0f;
|
|
NewVelocity -= relVel.GetSafeNormal() * drag / Mass * DeltaTime / WorldScale;
|
|
|
|
return NewVelocity;
|
|
}
|