Initial material visualizer

Cargo.lock

@@ -85,6 +85,21 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fc7eb209b1518d6bb87b283c20095f5228ecda460da70b44f0802523dea6da04"
 
+[[package]]
+name = "android-tzdata"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e999941b234f3131b00bc13c22d06e8c5ff726d1b6318ac7eb276997bbb4fef0"
+
+[[package]]
+name = "android_system_properties"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "anstream"
 version = "0.6.18"
@@ -401,6 +416,20 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fd16c4719339c4530435d38e511904438d07cce7950afa3718a84ac36c10e89e"
 
+[[package]]
+name = "chrono"
+version = "0.4.38"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a21f936df1771bf62b77f047b726c4625ff2e8aa607c01ec06e5a05bd8463401"
+dependencies = [
+ "android-tzdata",
+ "iana-time-zone",
+ "js-sys",
+ "num-traits",
+ "wasm-bindgen",
+ "windows-targets 0.52.6",
+]
+
 [[package]]
 name = "clap"
 version = "4.5.21"
@@ -506,7 +535,20 @@ dependencies = [
  "bitflags 1.3.2",
  "core-foundation",
  "core-graphics-types",
- "foreign-types",
+ "foreign-types 0.3.2",
+ "libc",
+]
+
+[[package]]
+name = "core-graphics"
+version = "0.23.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c07782be35f9e1140080c6b96f0d44b739e2278479f64e02fdab4e32dfd8b081"
+dependencies = [
+ "bitflags 1.3.2",
+ "core-foundation",
+ "core-graphics-types",
+ "foreign-types 0.5.0",
  "libc",
 ]
 
@@ -521,6 +563,18 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "core-text"
+version = "20.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c9d2790b5c08465d49f8dc05c8bcae9fea467855947db39b0f8145c091aaced5"
+dependencies = [
+ "core-foundation",
+ "core-graphics 0.23.2",
+ "foreign-types 0.5.0",
+ "libc",
+]
+
 [[package]]
 name = "crc32fast"
 version = "1.4.2"
@@ -570,6 +624,27 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7a81dae078cea95a014a339291cec439d2f232ebe854a9d672b796c6afafa9b7"
 
+[[package]]
+name = "dirs"
+version = "5.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "44c45a9d03d6676652bcb5e724c7e988de1acad23a711b5217ab9cbecbec2225"
+dependencies = [
+ "dirs-sys",
+]
+
+[[package]]
+name = "dirs-sys"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "520f05a5cbd335fae5a99ff7a6ab8627577660ee5cfd6a94a6a929b52ff0321c"
+dependencies = [
+ "libc",
+ "option-ext",
+ "redox_users",
+ "windows-sys 0.48.0",
+]
+
 [[package]]
 name = "dispatch"
 version = "0.2.0"
@@ -602,6 +677,18 @@ version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75b325c5dbd37f80359721ad39aca5a29fb04c89279657cffdda8736d0c0b9d2"
 
+[[package]]
+name = "dwrote"
+version = "0.11.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70182709525a3632b2ba96b6569225467b18ecb4a77f46d255f713a6bebf05fd"
+dependencies = [
+ "lazy_static",
+ "libc",
+ "winapi",
+ "wio",
+]
+
 [[package]]
 name = "ecolor"
 version = "0.24.1"
@@ -741,13 +828,65 @@ dependencies = [
  "miniz_oxide",
 ]
 
+[[package]]
+name = "float-ord"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ce81f49ae8a0482e4c55ea62ebbd7e5a686af544c00b9d090bba3ff9be97b3d"
+
+[[package]]
+name = "font-kit"
+version = "0.14.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b64b34f4efd515f905952d91bc185039863705592c0c53ae6d979805dd154520"
+dependencies = [
+ "bitflags 2.6.0",
+ "byteorder",
+ "core-foundation",
+ "core-graphics 0.23.2",
+ "core-text",
+ "dirs",
+ "dwrote",
+ "float-ord",
+ "freetype-sys",
+ "lazy_static",
+ "libc",
+ "log",
+ "pathfinder_geometry",
+ "pathfinder_simd",
+ "walkdir",
+ "winapi",
+ "yeslogic-fontconfig-sys",
+]
+
 [[package]]
 name = "foreign-types"
 version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f6f339eb8adc052cd2ca78910fda869aefa38d22d5cb648e6485e4d3fc06f3b1"
 dependencies = [
- "foreign-types-shared",
+ "foreign-types-shared 0.1.1",
+]
+
+[[package]]
+name = "foreign-types"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d737d9aa519fb7b749cbc3b962edcf310a8dd1f4b67c91c4f83975dbdd17d965"
+dependencies = [
+ "foreign-types-macros",
+ "foreign-types-shared 0.3.1",
+]
+
+[[package]]
+name = "foreign-types-macros"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a5c6c585bc94aaf2c7b51dd4c2ba22680844aba4c687be581871a6f518c5742"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.89",
 ]
 
 [[package]]
@@ -756,6 +895,12 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "00b0228411908ca8685dba7fc2cdd70ec9990a6e753e89b6ac91a84c40fbaf4b"
 
+[[package]]
+name = "foreign-types-shared"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aa9a19cbb55df58761df49b23516a86d432839add4af60fc256da840f66ed35b"
+
 [[package]]
 name = "form_urlencoded"
 version = "1.2.1"
@@ -765,6 +910,17 @@ dependencies = [
  "percent-encoding",
 ]
 
+[[package]]
+name = "freetype-sys"
+version = "0.20.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0e7edc5b9669349acfda99533e9e0bcf26a51862ab43b08ee7745c55d28eb134"
+dependencies = [
+ "cc",
+ "libc",
+ "pkg-config",
+]
+
 [[package]]
 name = "gethostname"
 version = "0.4.3"
@@ -786,6 +942,16 @@ dependencies = [
  "wasi",
 ]
 
+[[package]]
+name = "gif"
+version = "0.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "80792593675e051cf94a4b111980da2ba60d4a83e43e0048c5693baab3977045"
+dependencies = [
+ "color_quant",
+ "weezl",
+]
+
 [[package]]
 name = "gif"
 version = "0.13.1"
@@ -840,6 +1006,29 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
+[[package]]
+name = "iana-time-zone"
+version = "0.1.61"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "235e081f3925a06703c2d0117ea8b91f042756fd6e7a6e5d901e8ca1a996b220"
+dependencies = [
+ "android_system_properties",
+ "core-foundation-sys",
+ "iana-time-zone-haiku",
+ "js-sys",
+ "wasm-bindgen",
+ "windows-core",
+]
+
+[[package]]
+name = "iana-time-zone-haiku"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f31827a206f56af32e590ba56d5d2d085f558508192593743f16b2306495269f"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "icu_collections"
 version = "1.5.0"
@@ -989,7 +1178,7 @@ dependencies = [
  "byteorder",
  "color_quant",
  "exr",
- "gif",
+ "gif 0.13.1",
  "jpeg-decoder",
  "num-traits",
  "png",
@@ -1007,7 +1196,7 @@ dependencies = [
  "byteorder-lite",
  "color_quant",
  "exr",
- "gif",
+ "gif 0.13.1",
  "image-webp",
  "num-traits",
  "png",
@@ -1666,6 +1855,12 @@ version = "1.20.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1261fe7e33c73b354eab43b1273a57c8f967d0391e80353e51f764ac02cf6775"
 
+[[package]]
+name = "option-ext"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "04744f49eae99ab78e0d5c0b603ab218f515ea8cfe5a456d7629ad883a3b6e7d"
+
 [[package]]
 name = "orbclient"
 version = "0.3.48"
@@ -1681,7 +1876,7 @@ version = "0.25.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "22ec719bbf3b2a81c109a4e20b1f129b5566b7dce654bc3872f6a05abf82b2c4"
 dependencies = [
- "ttf-parser",
+ "ttf-parser 0.25.0",
 ]
 
 [[package]]
@@ -1719,6 +1914,25 @@ version = "1.0.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "57c0d7b74b563b49d38dae00a0c37d4d6de9b432382b2892f0574ddcae73fd0a"
 
+[[package]]
+name = "pathfinder_geometry"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b7b7e7b4ea703700ce73ebf128e1450eb69c3a8329199ffbfb9b2a0418e5ad3"
+dependencies = [
+ "log",
+ "pathfinder_simd",
+]
+
+[[package]]
+name = "pathfinder_simd"
+version = "0.5.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5cf07ef4804cfa9aea3b04a7bbdd5a40031dbb6b4f2cbaf2b011666c80c5b4f2"
+dependencies = [
+ "rustc_version",
+]
+
 [[package]]
 name = "percent-encoding"
 version = "2.3.1"
@@ -1731,6 +1945,52 @@ version = "0.3.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "953ec861398dccce10c670dfeaf3ec4911ca479e9c02154b3a215178c5f566f2"
 
+[[package]]
+name = "plotters"
+version = "0.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5aeb6f403d7a4911efb1e33402027fc44f29b5bf6def3effcc22d7bb75f2b747"
+dependencies = [
+ "chrono",
+ "font-kit",
+ "image 0.24.9",
+ "lazy_static",
+ "num-traits",
+ "pathfinder_geometry",
+ "plotters-backend",
+ "plotters-bitmap",
+ "plotters-svg",
+ "ttf-parser 0.20.0",
+ "wasm-bindgen",
+ "web-sys",
+]
+
+[[package]]
+name = "plotters-backend"
+version = "0.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "df42e13c12958a16b3f7f4386b9ab1f3e7933914ecea48da7139435263a4172a"
+
+[[package]]
+name = "plotters-bitmap"
+version = "0.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72ce181e3f6bf82d6c1dc569103ca7b1bd964c60ba03d7e6cdfbb3e3eb7f7405"
+dependencies = [
+ "gif 0.12.0",
+ "image 0.24.9",
+ "plotters-backend",
+]
+
+[[package]]
+name = "plotters-svg"
+version = "0.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "51bae2ac328883f7acdfea3d66a7c35751187f870bc81f94563733a154d7a670"
+dependencies = [
+ "plotters-backend",
+]
+
 [[package]]
 name = "png"
 version = "0.17.14"
@@ -1944,6 +2204,17 @@ dependencies = [
  "ray-tracing-core",
 ]
 
+[[package]]
+name = "ray-tracing-material-validator"
+version = "0.1.0"
+dependencies = [
+ "plotters",
+ "rand",
+ "ray-tracing-core",
+ "ray-tracing-material",
+ "rayon",
+]
+
 [[package]]
 name = "ray-tracing-renderer"
 version = "0.1.0"
@@ -2013,6 +2284,17 @@ dependencies = [
  "bitflags 2.6.0",
 ]
 
+[[package]]
+name = "redox_users"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ba009ff324d1fc1b900bd1fdb31564febe58a8ccc8a6fdbb93b543d33b13ca43"
+dependencies = [
+ "getrandom",
+ "libredox",
+ "thiserror",
+]
+
 [[package]]
 name = "regex"
 version = "1.11.1"
@@ -2063,6 +2345,15 @@ version = "0.1.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "719b953e2095829ee67db738b3bfa9fa368c94900df327b3f07fe6e794d2fe1f"
 
+[[package]]
+name = "rustc_version"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cfcb3a22ef46e85b45de6ee7e79d063319ebb6594faafcf1c225ea92ab6e9b92"
+dependencies = [
+ "semver",
+]
+
 [[package]]
 name = "rustix"
 version = "0.38.41"
@@ -2116,6 +2407,12 @@ dependencies = [
  "tiny-skia",
 ]
 
+[[package]]
+name = "semver"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "61697e0a1c7e512e84a621326239844a24d8207b4669b41bc18b32ea5cbf988b"
+
 [[package]]
 name = "serde"
 version = "1.0.215"
@@ -2488,6 +2785,12 @@ dependencies = [
  "winnow 0.6.20",
 ]
 
+[[package]]
+name = "ttf-parser"
+version = "0.20.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "17f77d76d837a7830fe1d4f12b7b4ba4192c1888001c7164257e4bc6d21d96b4"
+
 [[package]]
 name = "ttf-parser"
 version = "0.25.0"
@@ -2854,6 +3157,15 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 
+[[package]]
+name = "windows-core"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "33ab640c8d7e35bf8ba19b884ba838ceb4fba93a4e8c65a9059d08afcfc683d9"
+dependencies = [
+ "windows-targets 0.52.6",
+]
+
 [[package]]
 name = "windows-sys"
 version = "0.45.0"
@@ -3078,7 +3390,7 @@ dependencies = [
  "bitflags 1.3.2",
  "cfg_aliases",
  "core-foundation",
- "core-graphics",
+ "core-graphics 0.22.3",
  "dispatch",
  "instant",
  "libc",
@@ -3121,6 +3433,15 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "wio"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5d129932f4644ac2396cb456385cbf9e63b5b30c6e8dc4820bdca4eb082037a5"
+dependencies = [
+ "winapi",
+]
+
 [[package]]
 name = "write16"
 version = "1.0.0"
@@ -3179,6 +3500,17 @@ version = "0.13.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "66fee0b777b0f5ac1c69bb06d361268faafa61cd4682ae064a171c16c433e9e4"
 
+[[package]]
+name = "yeslogic-fontconfig-sys"
+version = "6.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "503a066b4c037c440169d995b869046827dbc71263f6e8f3be6d77d4f3229dbd"
+dependencies = [
+ "dlib",
+ "once_cell",
+ "pkg-config",
+]
+
 [[package]]
 name = "yoke"
 version = "0.7.5"

Cargo.toml

@@ -1,3 +1,3 @@
 [workspace]
-members = [ "ray-tracing-core", "ray-tracing-image", "ray-tracing-material", "ray-tracing-renderer", "ray-tracing-scene", "ray-tracing-tev", "ray-tracing-egui"]
+members = [ "ray-tracing-core", "ray-tracing-image", "ray-tracing-material", "ray-tracing-renderer", "ray-tracing-scene", "ray-tracing-tev", "ray-tracing-egui", "ray-tracing-material-visualizer"]
 resolver = "2"

ray-tracing-core/src/material.rs

@@ -12,6 +12,7 @@ pub trait Material<R: Rng>: Sync + Debug {
     }
 }
 
+#[derive(Debug)]
 pub struct SampleResult {
     w_out: Dir3,
     color: Color,

ray-tracing-material-visualizer/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "ray-tracing-material-validator"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+plotters = "0.3.7"
+rand = { version = "0.8.5", features = ["small_rng"] }
+ray-tracing-core = { path = "../ray-tracing-core" }
+ray-tracing-material = { path = "../ray-tracing-material" }
+rayon = "1.10.0"

ray-tracing-material-visualizer/src/bin/plot.rs

@@ -0,0 +1,13 @@
+use ray_tracing_core::color::Color;
+use ray_tracing_material::{diffuse::DiffuseMaterial, mirror::Mirror};
+use ray_tracing_material_validator::generate_chart;
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let m = Mirror::new(Color::new(1.0, 1.0, 1.0));
+    generate_chart("mirror.png", &m, 2)?;
+
+    let m = DiffuseMaterial::new(Color::new(1.0, 1.0, 1.0));
+    generate_chart("diffuse.png", &m, 100)?;
+
+    Ok(())
+}

ray-tracing-material-visualizer/src/lib.rs

@@ -0,0 +1,220 @@
+use std::ops::RangeBounds;
+
+use plotters::{coord::Shift, prelude::*, style::RelativeSize};
+use rand::{rngs::SmallRng, Rng, SeedableRng};
+use ray_tracing_core::prelude::*;
+use rayon::prelude::*;
+
+pub fn generate_chart<M: Material<SmallRng>>(
+    path: impl AsRef<std::path::Path>,
+    m: &M,
+    samples_per_pixel: usize,
+) -> Result<(), Box<dyn std::error::Error>> {
+    let root = BitMapBackend::new(&path, (800, 800)).into_drawing_area();
+
+    plot_material_sample(&root, m, samples_per_pixel)?;
+
+    root.present()?;
+
+    Ok(())
+}
+
+fn plot_material_sample<DB: DrawingBackend, M: Material<SmallRng>>(
+    root: &DrawingArea<DB, Shift>,
+    m: &M,
+    samples_per_pixel: usize,
+) -> Result<(), Box<dyn std::error::Error>>
+where
+    DB::ErrorType: 'static,
+{
+    root.fill(&WHITE)?;
+
+    let (upper, lower) = root.split_horizontally(RelativeSize::Width(0.5));
+
+    let mut upper_chart = ChartBuilder::on(&upper)
+        .margin(5)
+        .x_label_area_size(30)
+        .top_x_label_area_size(30)
+        .y_label_area_size(30)
+        .right_y_label_area_size(30)
+        .caption("Upper Hemisphere", ("sans-serif", 20))
+        .build_cartesian_2d(-1.0..1.0, -1.0..1.0)?;
+
+    upper_chart
+        .configure_mesh()
+        .disable_x_mesh()
+        .disable_y_mesh()
+        .draw()?;
+
+    let upper_area = upper_chart.plotting_area();
+
+    let mut lower_chart = ChartBuilder::on(&lower)
+        .margin(5)
+        .x_label_area_size(30)
+        .top_x_label_area_size(30)
+        .y_label_area_size(30)
+        .right_y_label_area_size(30)
+        .caption("Lower Hemisphere", ("sans-serif", 20))
+        .build_cartesian_2d(-1.0..1.0, -1.0..1.0)?;
+
+    lower_chart
+        .configure_mesh()
+        .disable_x_mesh()
+        .disable_y_mesh()
+        .draw()?;
+
+    let lower_area = lower_chart.plotting_area();
+
+    let (xrange, yrange) = upper_area.get_pixel_range();
+    let width = (xrange.end - xrange.start) as usize - 1;
+    let height = (yrange.end - yrange.start) as usize - 1;
+
+    let histogram = create_historgram(
+        m,
+        width,
+        height,
+        samples_per_pixel * width * height,
+        Dir3::new(1.0, 1.0, 0.0).normalize(),
+        0,
+    );
+
+    let map = ViridisRGB;
+
+    let max = histogram.max();
+
+    for (dir, f) in histogram.iter() {
+        let color = map.get_color_normalized(f, 0.0, max);
+        if dir.y() < 0.0 {
+            lower_area.draw_pixel((dir.x() as f64, dir.z() as f64), &color)?;
+        } else {
+            upper_area.draw_pixel((dir.x() as f64, dir.z() as f64), &color)?;
+        }
+    }
+
+    Ok(())
+}
+
+struct Histogram {
+    data: Vec<f32>,
+    inserted: usize,
+    width: usize,
+    height: usize,
+    max: f32,
+}
+
+impl Histogram {
+    fn new(width: usize, height: usize) -> Self {
+        Self {
+            data: vec![0.0; 2 * width * height],
+            inserted: 0,
+            width,
+            height,
+            max: 0.0,
+        }
+    }
+
+    fn discretize(&self, p: Dir3) -> usize {
+        (((p.x() + 1.0) * 0.5 * self.width as f32).floor() as usize)
+            + (((p.z() + 1.0) * 0.5 * self.height as f32).floor() as usize) * self.width
+            + if p.y() < 0.0 {
+                2 * self.width * self.height
+            } else {
+                0
+            }
+    }
+
+    fn insert(&mut self, pos: Dir3, value: f32) {
+        let index = self.discretize(pos);
+        self.data[index] += value;
+        self.max = f32::max(self.max, self.data[index]);
+        self.inserted += 1;
+    }
+
+    fn max(&self) -> f32 {
+        self.max / (self.inserted as f32)
+    }
+
+    fn iter(&self) -> impl Iterator<Item = (Dir3, f32)> + use<'_> {
+        let m = 1f32 / self.inserted as f32;
+        let width = self.width;
+        let height = self.height;
+        self.data
+            .iter()
+            .enumerate()
+            .map(move |(i, &f)| {
+                if i < width * height {
+                    let x = i % width;
+                    let z = i / width;
+
+                    let x = 2.0 * (x as f32 + 0.5) / (width as f32) - 1.0;
+                    let z = 2.0 * (z as f32 + 0.5) / (height as f32) - 1.0;
+                    let y = f32::sqrt(1.0 - x * x - z * z);
+
+                    (Dir3::new(x, y, z), f * m)
+                } else {
+                    let x = i % width;
+                    let z = (i - width * height) / width;
+
+                    let x = 2.0 * (x as f32 + 0.5) / (width as f32) - 1.0;
+                    let z = 2.0 * (z as f32 + 0.5) / (height as f32) - 1.0;
+                    let y = -f32::sqrt(1.0 - x * x - z * z);
+
+                    (Dir3::new(x, y, z), f * m)
+                }
+            })
+            .filter(|(dir, _)| dir.x() * dir.x() + dir.z() * dir.z() < 1.0)
+    }
+}
+
+impl ParallelExtend<(Dir3, f32)> for Histogram {
+    fn par_extend<I>(&mut self, par_iter: I)
+    where
+        I: IntoParallelIterator<Item = (Dir3, f32)>,
+    {
+        let (tx, rx) = std::sync::mpsc::sync_channel(100);
+
+        std::thread::scope(move |s| {
+            s.spawn(move || {
+                while let Ok((i, f)) = rx.recv() {
+                    self.insert(i, f)
+                }
+            });
+
+            {
+                let tx = tx;
+                par_iter.into_par_iter().for_each(|t| {
+                    let _ = tx.send(t);
+                });
+            }
+        });
+    }
+}
+
+fn create_historgram<M: Material<SmallRng>>(
+    m: &M,
+    width: usize,
+    height: usize,
+    executions: usize,
+    w_in: Dir3,
+    channel: usize,
+) -> Histogram {
+    let mut h = Histogram::new(width, height);
+    h.par_extend(
+        (0..executions)
+            .into_par_iter()
+            .map_init(SmallRng::from_entropy, |rng, _| {
+                let sample = m.sample(w_in, rng);
+
+                let f = match channel {
+                    0 => sample.color().r(),
+                    1 => sample.color().g(),
+                    2 => sample.color().b(),
+                    _ => unreachable!(),
+                };
+
+                (sample.w_out(), f)
+            }),
+    );
+
+    h
+}