From b64c7e972c52b7d015d661866f0cf902370343e5 Mon Sep 17 00:00:00 2001 From: Julian T Date: Sat, 6 Feb 2021 23:43:06 +0100 Subject: Implement pathtracing --- src/sample/mod.rs | 26 ++++++++++++++++++++++++-- 1 file changed, 24 insertions(+), 2 deletions(-) (limited to 'src/sample/mod.rs') diff --git a/src/sample/mod.rs b/src/sample/mod.rs index 6f2c3eb..84ac755 100644 --- a/src/sample/mod.rs +++ b/src/sample/mod.rs @@ -1,11 +1,33 @@ use crate::Float; -use crate::core::Vector2f; +use crate::core::{Vector3f, Vector2f}; +use std::f32::consts::PI; mod uniform; pub use uniform::UniformSampler; +fn distribute_between(x: Float, a: Float, b: Float) -> Float { + x * (b - a) + a +} + pub trait Sampler { fn get_sample(&mut self) -> Float; - fn get_sample_2d(&mut self) -> Vector2f; + + fn get_sample_2d(&mut self) -> Vector2f { + Vector2f::new_xy(self.get_sample(), self.get_sample()) + } + + fn get_unit_vector(&mut self) -> Vector3f { + let s2d = self.get_sample_2d(); + + let lambda = distribute_between(s2d.x, -PI, PI); + let costheta = 2.0 * s2d.y - 1.0; + let sintheta = costheta.acos().sin(); + + Vector3f::new_xyz( + lambda.cos() * sintheta, + lambda.sin() * sintheta, + costheta, + ) + } } -- cgit v1.2.3