ERROR: Condition "det == 0" is true.

OOwl · Oct 18, 2023

Hey there, I'm using Godot 3.5.2, Windows 10.

I'm getting this error: ERROR: Condition "det == 0" is true. It also says: at: Transform2D::affine_invert (core\math\transform_2d.cpp:49) - Condition "det == 0" is true.

The line it refers to is: var _mouse_pos = get_viewport().get_mouse_position()

I'm working on a 2D adventure game.

It only happens sometimes. It doesn't cause a crash, but since it's a red error, I'd like to eliminate it.

Please help. Thanks!

xyz · Oct 18, 2023

Owl How do you know that's the line? Maybe post the whole script.

OOwl · Oct 18, 2023

xyz That's the line it refers to when you click on the error (errors tend to refer to specific lines that trigger them).

As for the function (the line in question is the first one):

xyz · Oct 18, 2023

Owl The line in the error you posted (49) does not refer to your script. It refers to Godot's C++ source code. Nothing in the line var _mouse_pos = get_viewport().get_mouse_position() would call Transform2D::affine_invert(). The error is somewhere else. Possibly in one of your functions called from _process().

OOwl · Oct 18, 2023

xyz I didn't say "49" referred to my code. When I clicked on the error, it sends me directly to that line.

xyz · Oct 18, 2023

Owl Can you post a minimal reproduction project?

DaveTheCoder · Oct 18, 2023

Can you print the value of the Transform2D immediately before that line?

OOwl · Oct 18, 2023

xyz Not really, it's a whole game... I wouldn't know how to start trimming it down.

OOwl · Oct 18, 2023

DaveTheCoder How do I print it? What do I put in print() ?

DaveTheCoder · Oct 18, 2023

I thought you were calling Transform2D::affine_invert(). It looks like I'm mistaken.

xyz · Oct 18, 2023

DaveTheCoder Still, it's a good lead. Something somewhere has a zero scale transform. It's hard to determine what without seeing the broader context. So making a minimal reproduction project could help.

@Owl trim down bit by bit. Everything except that suspicious node can go, given that it still causes the error.

OOwl · Oct 19, 2023

xyz I'll try and do that... probably tomorrow.

Additional info: I think it tends to happen (potentially always) when the game is running in the background for a while and I'm doing something else (like, tinkering in Audacity). It then may fire, usually in groups of 3's whenever it happens.

OOwl · Oct 19, 2023

Okay, I know how to reproduce it 100% reliably: pressing Windows + D generates the red error. Every single time.

My friend speculates: "The reason for that is because what minimising the window does, is scale it into a small off-screen window."

xyz · Oct 19, 2023

Owl Do you have the latest 3.x build. If it's present there, it should be reported as an issue.

OOwl · Oct 19, 2023

xyz I have 3.5.2. I'm assuming it's the latest one? Though I may have read version 3.6 also exists.

xyz · Oct 19, 2023

Owl As a quick test try to early exit the _process() if the window is minimized.

func _process(delta):
	if OS.window_minimized:
		return
	
	# the rest of it

OOwl · Oct 19, 2023

xyz Sadly, still getting the error, but thanks for the input. I'll look into reporting it, though I can't say that I've reported anything before.

Cheers, I think I'll flag this thread as "solved" soon (if there is such a tag/flag) unless more input is given.

DaveTheCoder · Oct 19, 2023

Owl I have 3.5.2. I'm assuming it's the latest one?

3.5.3-stable and 3.6-beta3 are the latest 3.x releases.