Cargo Features

[dependencies]
fast3d = { version = "0.5.0", default-features = false, features = ["f3d", "f3dex2", "f3dex2e", "f3dzex2", "gbifloats"] }
default = f3dex2

The f3dex2 feature is set by default whenever fast3d is added without default-features = false somewhere in the dependency tree.

f3d
f3dex2 default f3dex2e? f3dzex2?
f3dex2e = f3dex2, gbifloats
f3dzex2 = f3dex2
gbifloats f3dex2e?

Fast3D has 6 features without comments.