Trait arendur::bxdf::microfacet::MicrofacetDistribution [−] [src]

pub trait MicrofacetDistribution {
    fn distribution(&self, wh: Vector3f) -> Float;
    fn lambda(&self, w: Vector3f) -> Float;
    fn sample_wh(&self, wo: Vector3f, u: Point2f) -> Vector3f;

    fn visible(&self, w: Vector3f) -> Float { ... }
    fn visible_both(&self, w0: Vector3f, w1: Vector3f) -> Float { ... }
    fn pdf(&self, wo: Vector3f, wh: Vector3f) -> Float { ... }
}

A microfacet distribution description

Required Methods

Given the macro surface normal wh, returns the differential area of microfacets from that angle

A physically plausible microfacet distribution $D$ should be normalized, s.t. $\integral_{H2(n)}D(\omega_h)cos\theta_h d\omega_h=1$

Given a direction w, return masked prjected surface area per visible projected surface area along that direction, assuming this value is independent from wh.

given a uniform sample, return a sampled macro normal wh

Provided Methods

fraction of facets visible from w. The masking-shadowing function $G_l$ This interface assumes independence from wh

fraction of facets visible from both w0 and w1

This interface assumes independence from wh

given wo and a sampled wh, returns the pdf of this sample

Implementors