DeltaTime and FPlatformTime

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#1

I took another challenge and tried to count ReloadTime (3,2,1)
At first I want to resolve this issue by the DeltaTIme:

void UTankAimingComponent::TimeComponent()
{
   myDelta = myDelta + DeltaTime;
   RoundLeft = RoundLeft - int(myDelta);  // RoundLeft = 3

this code don’t work myDelta collect the DeltaTime correctly but RoundLeft subtract myDelta significantly faster
when myDelta equaled 3,
RoundLeft was approximately -150

Then I sovled this problem by FPlatformTime::Second()

if (FPlatformTime::Seconds() - LastFireTime < ReloadTimeInSeconds)
{
	FiringState = EFiringState::Reloading;
    RoundLeft = 1+ReloadTimeInSeconds + LastFireTime - FPlatformTime::Seconds();

Can Somebody explain me why FPlatformTime works and DeltaTime is not ?
and why DeltaTIme’s behaviour is so strange ?

#2

FPlatformTime counts normal time since a specific moment, a certain date or the time you turned or installed your pc or something, basically its a normal time counting function.
DeltaTime on the other hand is a Time component that is basically the time that each frame takes to work, so it is heavily influenced by your computers performance, the optimization of your own code etc.

#3

Thank you for your opinion this post is older but as I remember the problem was subtract
I know difference Delta time and Normal time. In my code I collect Delta time in member variable myDelta and then it is subtracted also member variable Roundleft = 3.
and I get such case when myDelta = 3 Roundleft = -150. this is my question why I get such strange result ?

#4

hmm I can try to guess that since its called every frame that your mydelta got called a lot of times very quickly and if you didn’t reset or limit it somewhere else in the code it might have just gone overboard with its own iterations.

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