Cargo Features

[dependencies]
display3d = { version = "0.2.1", default-features = false, features = ["stl", "obj"] }
default = obj, stl

These default features are set whenever display3d is added without default-features = false somewhere in the dependency tree.

stl default

Enables stl_io

obj default

Enables tobj

display3d has 3 features without comments.