Features from optional dependencies

cgmath implicit feature

Enables cgmath

cgmath:

A linear algebra and mathematics library for computer graphics

Affects imath-traits::impl_cgmath

glam implicit feature

Enables glam <=0.21

glam:

A simple and fast 3D math library for games and graphics

Affects imath-traits::impl_glam

nalgebra implicit feature

Enables nalgebra <=0.29

Affects imath-traits::impl_nalgebra

nalgebra-glm implicit feature

Enables nalgebra-glm <=0.15

nalgebra-glm:

A computer-graphics oriented API for nalgebra, inspired by the C++ GLM library

Affects imath-traits::impl_nalgebra_glm