Version 0.3.0 of my Rust based PBRT implementation can render with bi-directional path tracing (BDPT) now:
On the left the same scene was rendered with uni-directional path tracing and the resulting image contains much more noise, on the right bi-directional path tracing was used (with otherwise identical settings). Rays leaving the scene without hitting geometry render black right now (see windows). This should be fixed for future releases.
Here is another scene which profits from using BDPT:
Version 0.3.0 consists of 105 public structs, 9 enums, 19 traits, and 138 public functions:
> pwd
/mill3d/users/jan/git/github/rs_pbrt/src
> rg -trust "^pub struct" | wc
105 423 4739
> rg -trust "^pub enum" | wc
9 36 371
> rg -trust "^pub trait" | wc
19 80 802
> rg -trust "^pub fn" | wc
138 1061 10024
Here are the traits:
> rg -trust "^pub trait"
core/microfacet.rs
12:pub trait MicrofacetDistribution {
core/texture.rs
17:pub trait TextureMapping2D {
77:pub trait Texture<T> {
core/lightdistrib.rs
21:pub trait LightDistribution {
core/interaction.rs
27:pub trait Interaction {
core/shape.rs
16:pub trait Shape {
core/integrator.rs
20:pub trait SamplerIntegrator {
core/primitive.rs
15:pub trait Primitive {
core/light.rs
23:pub trait Light {
113:pub trait AreaLight: Light {
core/sampler.rs
12:pub trait Sampler: SamplerClone {
36:pub trait PixelSampler: Sampler {
39:pub trait GlobalSampler: Sampler {
42:pub trait SamplerClone {
core/material.rs
20:pub trait Material {
core/reflection.rs
253:pub trait Bxdf {
307:pub trait Fresnel {
core/filter.rs
11:pub trait Filter {
core/camera.rs
16:pub trait Camera {
The next major release will hopefully implement Metropolis Light Transport (MLT). I already created an issue about it.
