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Cart #space_station_demo-1 | 2023-07-28 | Code ▽ | Embed ▽ | License: CC4-BY-NC-SA
101

Here's a quick demo of a 6 degree of freedom 3D engine that I have been working on.
You can just explore a small space station in a Descent-like style.

Controls
Z: Thrust
Arrow Keys: Turn
X+Arrows: Roll

Notes
The map is stored in a long string and is generated from a Blender OBJ file. The station is as complex as I can make it before running out of compressed code space. To make something larger, I think I would have to switch to more of a 3D tile system with room building blocks that snap together.

The engine uses a simplified portal system paired with convex sectors to determine room visibility and draw order.

Thanks
Thanks to Fred72 for the polyfill code. (https://www.lexaloffle.com/bbs/?tid=3393)

Updates: fixed some code that broke with version 2.5g

101

Good job, it works pretty well !

As I was discovering the space station, I get this error two times.

To reproduct, just go forward as the demo start and then turn around

Yeah... haven’t been able to debug that one yet. Error code isn’t especially informative about why it’s failing.



1

Quite fancy! (Tho a little trickier to control than I anticipated.)
For convenience/quality of life it might be nice to be able to toggle whether the vertical axis is inverted, as well as adding a control to fly backwards (maybe holding X and Z together?)

my frames died when I was looking at a certain spot but other than that flawless!
For some reason it feels really good to bonk things

I 100% agree that some control options would be handy— invert, reverse and such. Also, I want to see what a mouse control would feel like.

The cart stability issues are one of the reasons I released a demo — I think I am hitting some unhandled corner cases of the internal line drawing code (zep provided a temp fix) and maybe thrashing other areas too.

Usually the error codes indicate the failure type, so I wonder if something odd is happening with the interpreter. Also it’s giving “line 0” as error location, which feels abnormal.



I got the same error as dhostin twice. once, where he did, at the front, and once at what I assume is some sort of navigation panel near the back.

Edit: I also get a crash whenever I leave pico-8 running in the background.

@Joe25
Does the game crash or does the PICO-8 executable crash?

@electricgryphon

Nice. It's too bad there's no good button combo for reverse thrust. Z+X means you can't roll while thrusting forward. I tried double-click-and-hold but I kept engaging it by accident when feathering the accelerator. Hmm.

@Felice
Just the game. I'd be a bit more worried if it was the executable.

@Joe25
Ok cool. PICO-8 behaves differently when it's the background, so I was worried it might be a system crash.

For a bit, I had up + left or right as rolling-- I wonder if that feels more natural. It would have the benefit of freeing the x button for shooting or reverse or something like that...

the up and down are inverted make an option to invert the vertical turn direction

love this :)

Definitely feels like Descent right away, which I haven't even thought about in years! Lovely demo. Thanks for sharing.

Amazing demo man.

Wow! This is amazing. I used to play Decent a ton as a kid so this is pretty awesome. Bravo!

This is absolutely wild. Congrats.

very cool!

what is this

its broken

I fixed the code -- should work just fine now on this page.
Thanks all!



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