making a system be called before bevy draws stuff

[BipedPotato]

So basically i am making a collision system and it is contained in a ecs system. Is there a way i can make this system be called before bevy draws stuff because there is a lot of stuttering because bevy seems to be drawing stuff before this system is called.

[Lum3s]

Is something like this what you are looking for?

Unofficial Bevy Cheat Book - Stages

Alternatively if you want stageless, there is a plugin for that https://github.com/IyesGames/iyes_loopless and an open RFC which should be due soon.

[meowitzher]

I had the problem of stuttering in my collision system when there was ambiguity with running my collision system and bevy's propagate_transform system in the PostUpdate stage. I am currently ensuring that everything runs before this system, and I am not having any issues with stuttering or jitter currently.

Here's how I am doing this for reference:

        app.add_system_to_stage
        (          
            CoreStage::PostUpdate, 
            collision_system
            .before(bevy::transform::transform_propagate_system)
        );

Hopefully that helps!

I solved this with the help from other kind users in this thread, which should help you to further debug the problems you are having if the above doesn't work!