What is the most efficient way to spread bigger calculations over multiple frames

:information_source: Attention Topic was automatically imported from the old Question2Answer platform.
:bust_in_silhouette: Asked By Toger5
:warning: Old Version Published before Godot 3 was released.

I want to know if there is an efficient way to make bigger calculations over multiple frames.
In a project, where I’m currently working on, I need to do some bigger calculations which take almost half a second ore more. right now I spread them with a loop which only does X repetitions.

var x = 10 #process steps per frame
var curent_process_state = 0 
for i in range(x):
    #calculate longer process
    liste[i + current_process_state].calculate_time_consuming_function()
current_process_state += x

This kind of works but I have to approximate a value for x so that the game runs smooth.
It would be great if I could do it like:

func myFunc():
    for e in list:
execute myFunc for 0.02 seconds

Is there a way to do so in GDscript?

:bust_in_silhouette: Reply From: TotCac

A way that I use is Thread.
Then, a yield with idle frame in it

Here my code:

var source_list = {}; var thread = Thread.new()

func _ready():
        thread.start(self, "_test_de_thread", null)

func _test_de_thread(trash):
        var list1
        var list2
        while (true):
                list1 = get_tree().get_nodes_in_group("police")
                list2 = get_tree().get_nodes_in_group("civilian")
                print("Frame: ", get_tree().get_frame(), "group police: ", list1, ", group civilian: ", list2, ", List:", source_list)
                yield(get_tree(), "idle_frame")

Thank you! This seems to be exactly what i was looking for.
I didn’t try it out until now but I will, soon. :wink:

Toger5 | 2016-02-22 17:13

I tried it out now.
It seems that the yield() function isn’t even necessary. As I understand it only makes sure that the while loop only repeats once per frame. Is that correct or is there a deeper functionality behind it?

Toger5 | 2016-02-22 20:30

I was using this to prevent too heavy compute at same time, because if you dont, it can slow fps (less than without thread)

TotCac | 2016-02-23 17:15

Interacting with scene tree is not thread safee, so this code may result in error

ariorick | 2021-10-30 08:59