Toggle "Use Fixed Frame Rate" via Blueprint possible at runtime?

Development Programming & Scripting Blueprint
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1

Is there any way to enable/disable the “Use Fixed Frame Rate”-Option from the Project-Settings via Blueprint or in a similar/other way at runtime?

2

There’s this node in Game User Settings called Set Frame Rate Limit. That might be what you’re looking for?

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3

Unfortunately not. The behaviour of Set Frame Rate Limit and Use Fixed Frame Rate is different. For Use Fixed Frame Rate i am expecting a certain behaviour of my game at runtime as for setting the Set Frame Rate Lmit.

It should be a boolean value to be set/unset. Here is a screenshot from the area of the Project-Setting:

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I just need this one value to be set/unset at runtime but couldn’t find any clues yet on how to do so.

Edit: Even though I assume it is not possible to be set at runtime, I hope to get an explanation on why it does not.

4

This seems to be the only way to get Unreal Engine games to stop hitting max GPU making GPU fans go crazy in empty scenes yet there isn’t a way to manually toggle this during runtime. This makes zero sense.

5

it can be done at runtime with c++

Plugins.zip (13.3 MB)

code inside of plugin

header

// Copyright Epic Games, Inc. All Rights Reserved.

#pragma once

#include "Kismet/BlueprintFunctionLibrary.h"
#include "frameRateTogglerBPLibrary.generated.h"

/* 
*	Function library class.
*	Each function in it is expected to be static and represents blueprint node that can be called in any blueprint.
*
*	When declaring function you can define metadata for the node. Key function specifiers will be BlueprintPure and BlueprintCallable.
*	BlueprintPure - means the function does not affect the owning object in any way and thus creates a node without Exec pins.
*	BlueprintCallable - makes a function which can be executed in Blueprints - Thus it has Exec pins.
*	DisplayName - full name of the node, shown when you mouse over the node and in the blueprint drop down menu.
*				Its lets you name the node using characters not allowed in C++ function names.
*	CompactNodeTitle - the word(s) that appear on the node.
*	Keywords -	the list of keywords that helps you to find node when you search for it using Blueprint drop-down menu. 
*				Good example is "Print String" node which you can find also by using keyword "log".
*	Category -	the category your node will be under in the Blueprint drop-down menu.
*
*	For more info on custom blueprint nodes visit documentation:
*	https://wiki.unrealengine.com/Custom_Blueprint_Node_Creation
*/
UCLASS()
class UframeRateTogglerBPLibrary : public UBlueprintFunctionLibrary
{
	GENERATED_UCLASS_BODY()

	UFUNCTION(BlueprintCallable, meta = (DisplayName = "Set Fixed frame rate", Keywords = "fixed frame rate toggle"), Category = "Toggler")
	
	static void SetFixedFrameRate(bool fixed, int32 maxFPS, bool debug = false);
};

cpp

// Copyright Epic Games, Inc. All Rights Reserved.

#include "frameRateTogglerBPLibrary.h"
#include "frameRateToggler.h"
//#include "Runtime/Engine/Public/EngineGlobals.h"
#include "EngineGlobals.h"

UframeRateTogglerBPLibrary::UframeRateTogglerBPLibrary(const FObjectInitializer& ObjectInitializer)
: Super(ObjectInitializer)
{

}


#include "Kismet/KismetStringLibrary.h"

void UframeRateTogglerBPLibrary::SetFixedFrameRate(bool fixed, int32 maxFPS, bool debug)
{
	if (GEngine) {
		GEngine->bUseFixedFrameRate = fixed;
		if (debug == true) {
			GEngine->AddOnScreenDebugMessage(1, 1, FColor(0, 0, 0), UKismetStringLibrary::Conv_BoolToString(fixed));
		}
		if (fixed == true) {
			GEngine->SetMaxFPS(maxFPS);
			GEngine->FixedFrameRate = maxFPS;
		}
		else {
			GEngine->SetMaxFPS(99999999999);
			GEngine->FixedFrameRate = 99999999999;
		}
	}
}

Unfortunately packing of the plugin itself causes problems because of GEngine, but packing it inside of a project seems to work