make features better

Cargo.toml

@@ -4,9 +4,8 @@ version = "0.1.0"
 edition = "2021"
 
 [features]
-default = ["small_rng", "oidn"]
+default = ["oidn"]
 small_rng = ["rand/small_rng"]
-thread_rng = []
 oidn = [
     "dep:oidn",
     "dep:flate2",

src/material/mod.rs

@@ -35,11 +35,14 @@ fn random_unit_vector(rand_state: &mut RNGType) -> (Vec3<FloatSize>, FloatSize)
     fn pdf() -> FloatSize {
         1.0 / (4.0 * PI as FloatSize)
     }
-    let theta: FloatSize = rand_state.gen_range(0.0..(2.0 * PI as FloatSize));
-    let phi_cos: FloatSize = rand_state.gen_range(-1.0..=1.0);
-    let phi_sin: FloatSize = (1.0 - phi_cos * phi_cos).sqrt();
+    let theta: FloatSize = rand_state.gen_range(0.0..(PI as FloatSize));
+    let phi: FloatSize = rand_state.gen_range(0.0..(2.0 * PI as FloatSize));
     (
-        Vec3::new([phi_sin * theta.cos(), phi_cos, phi_sin * theta.sin()]),
+        Vec3::new([
+            theta.sin() * phi.cos(),
+            theta.sin() * phi.sin(),
+            theta.cos(),
+        ]),
         pdf(),
     )
 }

src/pathtracer/mod.rs

@@ -44,7 +44,7 @@ impl PathTracer {
 
                     let sample_type = if debug {
                         if is_left {
-                            SamplingFunctions::CosineWeightedSample1
+                            SamplingFunctions::RandomUnitVector
                         } else {
                             SamplingFunctions::CosineWeightedSample2
                         }
@@ -95,8 +95,8 @@ fn denoise_image(width: usize, height: usize, buffer: &mut Vec<Vec3<FloatSize>>)
 }
 
 pub fn get_rng() -> RNGType {
-    #[cfg(feature = "thread_rng")]
+    #[cfg(not(feature = "small_rng"))]
     return rand::thread_rng();
-    #[cfg(all(feature = "small_rng", not(feature = "thread_rng")))]
+    #[cfg(feature = "small_rng")]
     return <rand::rngs::SmallRng as rand::SeedableRng>::from_entropy();
 }

src/scene/mod.rs

@@ -12,25 +12,14 @@ use crate::{
     utils::vector::{Vec2, Vec3},
 };
 
-// #[cfg(all(feature = "small_rng", feature = "thread_rng"))]
-// compile_error!(
-//     "feature \"small_rng\" and feature \"thread_rng\" cannot be enabled at the same time"
-// );
-// #[cfg(feature = "small_rng")]
-// pub type RNGType = rand::rngs::SmallRng;
-// #[cfg(feature = "thread_rng")]
-// pub type RNGType = rand::rngs::ThreadRng;
-
 pub type FloatSize = f64;
 pub const PI: FloatSize = std::f64::consts::PI as FloatSize;
 
 cfg_if! {
-    if #[cfg(feature="thread_rng")]{
-        pub type RNGType = rand::rngs::ThreadRng;
-    } else if #[cfg(feature="small_rng")] {
+    if #[cfg(feature="small_rng")] {
         pub type RNGType = rand::rngs::SmallRng;
     } else {
-        compile_error!("Either feature \"small_rng\" or feature \"thread_rng\" must be enabled");
+        pub type RNGType = rand::rngs::ThreadRng;
     }
 }