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use crate::scene::Scene;
use crate::core::{Ray, Spectrum};
use crate::sample::Sampler;
use super::Tracer;
pub struct PathTracer<'a> {
depth: i32,
scn: &'a Scene,
}
impl PathTracer<'_> {
pub fn new(scn: &Scene, depth: Option<i32>) -> PathTracer {
let depth = depth.unwrap_or(-1);
PathTracer {
depth,
scn,
}
}
pub fn trace_recur(&self, sampler: &mut dyn Sampler, ray: &Ray) -> Spectrum {
if let Some(i) = self.scn.intersect(ray) {
// Get a random direction in the hemisphere a i.p
// This is Lambertian reflection
let target = i.p + i.n + sampler.get_unit_vector();
return self.trace_recur(sampler, &Ray::new_to(i.p, target)) * 0.5;
}
// Simulates a sky
let t = (ray.direction.norm().y + 1.0) * 0.5;
Spectrum::new_rgb(1.0, 1.0, 1.0) * (1.0-t) + Spectrum::new_rgb(0.5, 0.7, 1.0) * t
}
}
impl Tracer for PathTracer<'_> {
fn trace(&self, sampler: &mut dyn Sampler, ray: &Ray) -> Spectrum {
self.trace_recur(sampler, ray)
}
}
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