1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68

//! **Integrator** is an abstract base class that defines the
//! **render()** method that must be provided by all integrators.
//!
//! - AOIntegrator
//! - BDPTIntegrator
//! - DirectLightingIntegrator
//! - MLTIntegrator
//! - PathIntegrator
//! - SPPMIntegrator
//! - VolPathIntegrator
//! - WhittedIntegrator
//!
//! ## Ambient Occlusion (AO)
//!
//! Ambient Occlusion is most often calculated by casting rays in
//! every direction from the surface. Rays which reach the background
//! or sky increase the brightness of the surface, whereas a ray which
//! hits any other object contributes no illumination. As a result,
//! points surrounded by a large amount of geometry are rendered dark,
//! whereas points with little geometry on the visible hemisphere
//! appear light.
//!
//! ![Ambient Occlusion](/doc/img/cornell_box_pbrt_rust_ao.png)
//!
//! ## Direct Lighting
//!
//! The **DirectLightingIntegrator** accounts only for direct lighting
//! — light that has traveled directly from a light source to the
//! point being shaded — and ignores indirect illumination from
//! objects that are not themselfes emissive, except for basic
//! specular reflection and transmission effects.
//!
//! ![Direct Lighting](/doc/img/cornell_box_pbrt_rust_directlighting.png)
//!
//! ## Path Tracing
//!
//! Path tracing incrementally generates paths of scattering events
//! starting at the camera and ending at light sources in the scene.
//!
//! ![Path Tracing](/doc/img/cornell_box_pbrt_rust_path.png)
//!
//! ## Bidirectional Path Tracing (BDPT)
//!
//! Bidirectional path tracing is a generalization of the standard
//! pathtracing algorithm that can be much more efficient. It
//! constructs paths that start from the camera on one end, from the
//! light on the other end, and connects in the middle with a
//! visibility ray.
//!
//! ![Bidirectional Path
//! Tracing](/doc/img/art_gallery_pbrt_rust_bdpt.png)
//!
//! ## Stochastic Progressive Photon Mapping (SPPM)
//!
//! A photon mapping integrator that uses particles to estimate
//! illumination by interpolating lighting contributions from
//! particles close to but not quite at the point being shaded.
//!
//! ![Stochastic Progressive Photon Mapping](/doc/img/caustic_glass_pbrt_rust_sppm.png)

pub mod ao;
pub mod bdpt;
pub mod directlighting;
pub mod mlt;
pub mod path;
pub mod sppm;
pub mod volpath;
pub mod whitted;