Awaiting asset loading within startup system | Bevy | Page 1

foggy pecan Nov 19, 2022, 5:25 PM

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Is there a lighter way of loading a custom asset? We are using the bevy_pathmesh and had a very bad time getting asset loading to work.

We thought we could do everything in a startup system. Looking at the example from that crate, he used a startup system to load the asset with asset_server.load() and then had a second system running, checking if it was loaded and then did the spawning logic.

This approach of having a custom system checking each cycle if the asset is loaded, even after it has been loaded, seems weird to me. Now, looking at the official bevy examples (https://github.com/bevyengine/bevy/blob/latest/examples/asset/custom_asset.rs), I can see this seems to be the default / recommended way.

Is there no other option of awaiting asset loading within a startup system?

tiny silo Nov 19, 2022, 5:33 PM

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I've been using states to load custom assets, so I'll have a starting state that loads on enter, checks until the asset is loaded, then exits / transitions to a state that can assume the asset's loaded. This is a good starting place for states I think

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https://github.com/bevyengine/bevy/blob/920543c824735dc1df6f4a59e7036e653dd5a553/examples/ecs/state.rs

foggy pecan Nov 19, 2022, 5:37 PM

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oh wow, system set is new to me but looks veeery promising! I will give that a try later and refactor it. I'll let you know if that did the trick for my project. gonna be afw for a while until then. but thanks already for this proposal!

forest spear Nov 20, 2022, 12:03 AM

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That pattern is pretty prevalent, and you can see it in action with actual assets here:
https://github.com/bevyengine/bevy/blob/latest/examples/2d/texture_atlas.rs

https://github.com/NiklasEi/bevy_asset_loader is an excellent plugin that does all that for you.

#Awaiting asset loading within startup system