Character.cpp

    void AROMCharacter::OnFire()
    {
        // try and fire a projectile
        if (ProjectileClass != NULL)
        {
            // Get the camera transform
            FVector CameraLoc;
            FRotator CameraRot;
            GetActorEyesViewPoint(CameraLoc, CameraRot);
            // MuzzleOffset is in camera space, so transform it to world space before offsetting from the camera to find the final muzzle position
            FVector const MuzzleLocation = CameraLoc + FTransform(CameraRot).TransformVector(MuzzleOffset);
            FRotator MuzzleRotation = CameraRot;
            MuzzleRotation.Pitch += 10.0f;          // skew the aim upwards a bit
            UWorld* const World = GetWorld();
            if (World)
            {
                FActorSpawnParameters SpawnParams;
                SpawnParams.Owner = this;
                SpawnParams.Instigator = Instigator;
                // spawn the projectile at the muzzle
                AROMProjectile* const Projectile = World->SpawnActor<AROMProjectile>(ProjectileClass, MuzzleLocation, MuzzleRotation, SpawnParams);
                if (Projectile)
                {
                    // find launch direction
                    FVector const LaunchDir = MuzzleRotation.Vector();
                    Projectile->InitVelocity(LaunchDir);
                }
            }
        }
    }