Well one day I was playing around with the window size until I got a Floating point division by 0 error message.
I screen recorded it in HD, Here is the video

So...Can someone tell me why this happened?
Thanks
~ReCreate

You have no code dividing by window height, right? If not that, it may be an issue with GM's scaling code. Try it with an empty room and see if this still happens.

Hmmm...that could be it, But I don't think I had anything doing that, I noticed it only happened when in 3D mode.
And if it was that, Wouldn't it just say Division by 0?

Might have to do with calculating the aspect ratio. That's where one would divide by the height.

Yeah, I've seen this before, and I think Tepi probably has it exactly right.

http://gmc.yoyogames.com/index.php?showtopic=426071
http://www.gmlscripts.com/forums/viewtopic.php?id=1572

Interestingly, the problem doesn't seem to affect GM6. It has apparently been fixed for GM8.

http://gm8.yoyogames.com/view.php?id=343

Oh well then, But where and why would GM calculate the aspect ratio?

Does it matter?

Matters big time...

Fix: ( GM7 Only!)

Open your compiled game in a hex editor.

Go to 09CA08. (This offset is in hex)
You should see the bytes:
"DB 45 E0 DE F1"
Replace them with:
"E9 93 3C 0E 00".

Next, go to 180696. (This offset is also in hex)
You should see:
"6A 00 6A 00 6A 00 6A 00 6A 00 6A 00 6A 00 6A 00 6A 00 6A 00 6A 00 6A 00 6A 00 6A 00 6A 00 6A 00 6A 00 6A"
Replace with: (Most hex editors have a "paste hex" function)
"B1 12 6A 00 FE C9 75 FA EB 1A 6A 00 DB 14 24 83 3C 24 00 75 04 D9 E8 DE C1 DB 45 E0 DE F1 E9 54 C3 F1 FF"

Bear in mind though, that this code will be replaced if you use the anti-decompiler. Just use the anti-decompiler first, apply the patch next, then optionally apply the compressor last.

You seem to know a lot with GM's EXE data structure...

It's one of the few cases where I actually use a debugger for... debugging

My goodness, I don't know how you managed to get that, but that's incredible. Keep up the good work!

I'm not doubting that it works... but may I ask HOW it works?

Did a little ASM hacking, optimized 18 "push 0" into a much shorter loop of pushes (using CL as counter; yes, I did check that it is not needed later), then used the free space left over to implement a check for the division by zero and avert it. I then just JMP'd to this free space from the original location, and JMP'd back when the check finished.

It is probably used when calling functions in Direct3D. I don't think Mark expected someone to create a 0 width or height view/room.

i don't think mark overmars expected game maker to be anything.

Explain. You make no sense.