How to switch Bevy engine from f32 to f64 type?

[SKY-ALIN]

I want to switch the type for translation across all components of my project. I know there are special f64-based types, but how to enable them for the entire engine? For example for the Transform component? Is there something like DTransform?

[alice-i-cecile]

This is not currently supported. See #1680 for previous discussion. Your current options are a) fork and modify Bevy b) use https://docs.rs/big_space/latest/big_space/ or a similar strategy to meet your goals.

Is this for a very large space game or the like? We're considering changing how Transform works to make it more flexible, and I'd like to understand the use cases better.

[SKY-ALIN]

Right, I use Bevy for a space physics simulation and related parameters like distance and speed can be like let sun_distance: f32 = 149_597_871_000.0; (meters) or let mercury_velocity: f32 = 47_900; (m/s). In this case, I have rendering artifacts on large distances

Screencast.from.30-09-24.01.51.31.webm

[SKY-ALIN]

I'd appreciate any advice or hacks for hot fixing or optimizing it

[alice-i-cecile]

Strongly recommend using big_space for this :) It's designed for exactly this sort of use case, and I've seen demos of it covering many orders of magnitude more than you have. There's crate-help thread for it on Discord for follow-up questions if you need more assistance (I haven't built this sort of project myself).

[SKY-ALIN]

Thank you!