Module vec3 

Lightweight Vec3 helper functions used throughout the BRDF library.

Functions

cartesian_to_spherical

Cartesian to spherical (theta, phi).

dot_clamp

Dot product, clamped to [0, 1].

dot_clamp_eps

Dot product, clamped to [0 + epsilon, 1] to avoid division by zero.

orthonormal_basis

Construct a local orthonormal basis (tangent t, bitangent b) from surface normal n using the Duff et al. 2017 method.

reflect

Reflect v around n.

refract

Refract v through a surface with relative IOR eta. Returns None on total internal reflection.

saturate

Saturate (clamp to [0, 1]).

schlick_scalar

Schlick Fresnel approximation (scalar version).

spherical_to_cartesian

Spherical direction to cartesian.