Real-world units not specified

[Pyxrs]

When working with real-world values, I am not sure which scale factors need to be applied to properly recreate them in my Bevy project. Some documentation on units for properties like mass and velocity would be nice, like Bevy provides for lights and cameras.

[andrewexton373]

I second this question! I'm wondering what the units for ExternalTorque are, but haven't been able to find anything documented.

[gigamicro]

i'm pretty sure mass is defined as relative in this engine (thus so are forces), deltas (eg velocity) are x-per-second, and the only reason 1.0 is a meter is because the default gravity is -9.81y
in my current prototype, mass is in kilograms, so 1 density (the default) is extremely light (1kgm¯³)
if i multiply all the densities by, say, ten, nothing changes unless i have some set force in my code that i didn't also multiply

edit: should still be documented, just a "all mass is relative" in a few places and a clarification that torques are (mass)*rad/sec