Bevy frame-dependent rendering

[torsteingrindvik]

I have a use case where instead of using time deltas to calculate transforms smoothly across frames, I want to instead be able to render my program determinstically given some frame number.

So then I can have some resource MyFrameCount(u64) or something, and calculate transforms from that. I don't expect many issues here.

But I also have animations, and as far as I can tell there doesn't seem to be a well-fitting API or approach to having them be determinstic.

Perhaps I can have animations paused always, then do something like

let anim_seek = (my_frame_count * anim_speed) % clip_duration; // since seek API must be in clip duration range

but maybe someone has any advice of what to do/what to expect?

[mockersf]

you can use the Time resource everywhere, and add the resource TimeUpdateStrategy::ManualDuration.

That way you don't have to have special code for test!

[torsteingrindvik]

Thanks, the ManualInstant variant along with tracking my own starting instant + an offset based on simulation frame count works wonders.

Only problem is that I can only step forwards because of a limitation in the Bevy time impl, but I can make an issue for that.