Dungeon Crawler predefined step length

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1

Godot Version

4.3

Question

Hi folks!
I’n quite new to Godot. I have a question. I’m trying to make a simple Dungeon Crawler game and I crashed right at the beginning. I have tis script for the movement:
extends Node3D

extends CharacterBody3D

var move_distance = 120 
var rotation_angle = PI/2

func _input(event):
	if event.is_action_pressed("ui_up"):
		velocity = -transform.basis.z * move_distance
		move_and_slide()
	elif event.is_action_pressed("ui_down"):
		velocity = transform.basis.z * move_distance
		move_and_slide()
	elif event.is_action_pressed("ui_left"):
		rotate_y(rotation_angle)
	elif event.is_action_pressed("ui_right"):
		rotate_y(-rotation_angle)

But there is an issue with the “var move distance” I discovered the value just by trial/error. But whenever I change the window size, the value is not valid anymore (steps are much longer with bigger screen size). How should I change the script to make 1 m steps no matter what screen size I use? (For the simplicity, the size of the “game unit” is 1 m…)
Thank you in advance

2

Please update your post with proper formatting using ``` for code snippets.
Also, you mentioned “var move distance”, but it’s not in the code anywhere. What do you mean?

3

I’m sorry, I didn’t know the rules here. The post is updated with the right code.

4

I’d assume the simplest way would be to scale your game to the screen size. This recent question shows how to do this How do I make sure that the field of view stays the same for all screen sizes?

If you don’t want to scale then you could probably use the Window class to get the window size and use that to calculate your move_distance. However, I’m not sure if this is the best/easiest way.

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5

Thank you so much! That was it (the first method). Although I don’t know where does the final value of the move _distance = 240 come from. It has nothing to do with the GrigMap3D cell size, nor the size of the tile… :smiley:

6

I believe it’s value is pixels/second

Remember that the values being used (for speed at least) are pixels/second.

Is mentioned on this docs page Kinematic character (2D) — Godot Engine (stable) documentation in English

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7

Could there be another approach? Because according your answer, the distance walked in one keypress could change in more / less complicated scenes. As well as with the change of the resolution. Simply put, the engine isn’t capable to walk exactly 240 pixels/second in every situation… Does it also mean that on a faster computer (mine isn’t any killer machine), the value of move_distance should be different?

8

You are correct, if the game is running at a different FPS the player will seemingly move faster or slower!

The solution is to multiply the speed by the delta time, this way regardless of the FPS movement will be consistent.

This was also discussed recently in this thread Need Help With Delta Time

The delta parameter in the _process() function refers to the frame length - the amount of time that the previous frame took to complete. Using this value ensures that your movement will remain consistent even if the frame rate changes.

From docs Coding the player — Godot Engine (stable) documentation in English

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