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use crate::world::{Hittable, Scene};
use crate::core::{Ray, Spectrum};
use crate::material::Material;
use crate::sample::Sampler;
use super::Tracer;
pub struct PathTracer<'a> {
depth: i32,
scn: &'a Scene,
background: Option<Box<dyn Material>>,
}
impl PathTracer<'_> {
pub fn new(scn: &Scene, depth: Option<i32>, background: Option<Box<dyn Material>>) -> PathTracer {
let depth = depth.unwrap_or(-1);
PathTracer {
depth,
scn,
background,
}
}
pub fn trace_recur(&self, sampler: &mut dyn Sampler, ray: &Ray, depth: i32) -> Spectrum {
if depth == 0 {
return Spectrum::ZERO;
}
if let Some(i) = self.scn.intersect(ray) {
if let Some(mat) = i.m {
let mut col = Spectrum::ZERO;
if let Some((scalar, nray)) = mat.scatter(ray, &i, sampler) {
col += &(self.trace_recur(sampler, &nray, depth-1) * scalar);
}
if let Some(c) = mat.emitted(ray) {
col += &c;
}
return col;
}
}
// If no color return background
if let Some(back) = &self.background {
back.emitted(ray).unwrap_or(Spectrum::ZERO)
} else {
Spectrum::ZERO
}
}
}
impl Tracer for PathTracer<'_> {
fn trace(&self, sampler: &mut dyn Sampler, ray: &Ray) -> Spectrum {
self.trace_recur(sampler, ray, self.depth)
}
}
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