Skip to main content

Browse GamesGame JamsUpload GameDeveloper LogsCommunity
Indie game storeFree gamesFun gamesHorror games
Game developmentAssetsComics
SalesBundles
Jobs
TagsGame Engines
Alex's Account160 days ago

oh geeze, I found the bug that pulls it to the right.

The rocket physics is pretty basic. I don't do anything hand-rolled. Its just a rigidbody physics object that I apply some force to and let the physics engine handle the rest. But, I also applied a constant force to it so the player doesn't slow down too much for the longer levels. The problem is, I forgot to rotate that constant force in the direction of travel. It doesn't fix the determinism, but its still something.

Awesome! Thanks for your help!

Reply
someotherguy160 days ago

Just commenting as a sanity check: Is all your simulation logic done during _physics_process? If any part is in _process, maybe the non-determinism is due to minor timing changes since _process has no guarantees that it runs on a consistent time step.

Reply
Alex's Account158 days ago

The actual physics processing is done in _integrate_forces, but I set the flags to turn thrust on/off outside of that. I think this is where the discrepancy in the time-step is causing me problems.

I switched from 'add_constant_central_force()' to 'apply_central_impulse()' and it appears to have fixed it, but now I need to figure out how to integrate the "burn duration" slider back in. (it was just an await() to reset the constant force, but I didn't want to move that into _integrate_forces())

Looks like I have some refactoring to do now.

Thanks for your help!

Reply
someotherguy158 days ago

You're awaiting a scene tree timer https://docs.godotengine.org/en/stable/classes/class_scenetree.html#class-scenet... ? If so, having the timer run with process_in_physics set to true should be enough then. Since the physics ticks are on a fixed time step.

Reply
Alex's Account157 days ago

Yup, that fixed it. Saved me having to rework the sliders. Thanks.

Reply
AboutFAQBlogContact us
Copyright © 2026 itch corp · Directory · Terms · Privacy · Cookies