pbrt_r3/core/light/
visibility_tester.rs

1use crate::core::interaction::*;
2use crate::core::sampler::*;
3use crate::core::scene::*;
4use crate::core::spectrum::*;
5
6#[derive(Clone)]
7pub struct VisibilityTester {
8    pub p0: Interaction,
9    pub p1: Interaction,
10}
11
12impl VisibilityTester {
13    pub fn new() -> Self {
14        VisibilityTester {
15            p0: Interaction::default(),
16            p1: Interaction::default(),
17        }
18    }
19
20    pub fn unoccluded(&self, scene: &Scene) -> bool {
21        return !scene.intersect_p(&self.p0.spawn_ray_to(&self.p1));
22    }
23
24    pub fn tr(&self, scene: &Scene, sampler: &mut dyn Sampler) -> Spectrum {
25        let mut ray = self.p0.spawn_ray_to(&self.p1);
26        // pbrt-r3:
27        //if !scene.intersect_p(&ray) {
28        //    return Spectrum::one();
29        //}
30        // pbrt-r3:
31
32        let mut tr = Spectrum::one();
33        loop {
34            //let t_max = ray.t_max.get();
35            if let Some(isect) = scene.intersect(&ray) {
36                if let Some(primitive) = isect.get_primitive() {
37                    if primitive.get_material().is_some() {
38                        //ray.t_max.set(t_max);
39                        //if primitive.intersect_p(&ray) {
40                        //check if the ray intersects the primitive
41                        return Spectrum::zero();
42                        //}
43                    }
44                }
45
46                if let Some(medium) = ray.medium.as_ref() {
47                    tr *= medium.as_ref().tr(&ray, sampler);
48                }
49
50                let tisect = Interaction::from(isect);
51                ray = tisect.spawn_ray_to(&self.p1);
52            } else {
53                if let Some(medium) = ray.medium.as_ref() {
54                    tr *= medium.as_ref().tr(&ray, sampler);
55                }
56                break;
57            }
58        }
59        return tr;
60    }
61}
62
63impl From<(&Interaction, &Interaction)> for VisibilityTester {
64    fn from(value: (&Interaction, &Interaction)) -> Self {
65        VisibilityTester {
66            p0: value.0.clone(),
67            p1: value.1.clone(),
68        }
69    }
70}
71
72impl From<(Interaction, Interaction)> for VisibilityTester {
73    fn from(value: (Interaction, Interaction)) -> Self {
74        VisibilityTester {
75            p0: value.0,
76            p1: value.1,
77        }
78    }
79}
pbrt_r3/core/light/visibility_tester.rs

pbrt_r3/core/light/
visibility_tester.rs
