library: render: add basics for Pathtracer
This is simple ray-tracing, with a binary white-or-black color depending on whether we hit an object or not.
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@ -1,5 +1,8 @@
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use super::super::utils::{buffer_to_image, prepare_buffer};
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use super::super::Renderer;
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use crate::scene::Scene;
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use crate::core::LinearColor;
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use crate::scene::{Object, Scene};
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use beevee::ray::Ray;
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use image::RgbImage;
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/// Render the [`Scene`] using Pathtracing
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@ -23,7 +26,48 @@ impl Pathtracer {
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///
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/// [`Scene`]: ../scene/scene/struct.Scene.html
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pub fn render(&self) -> RgbImage {
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todo!()
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let (width, height) = (
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self.scene.camera.film().width(),
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self.scene.camera.film().height(),
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);
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let total = width * height;
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let mut buffer = prepare_buffer(total);
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// (total passes, film)
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// FIXME: use MultiProgress because of rendering issues
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let (pa, pb) = super::super::progress::get_multiple_progress(total, self.scene.shot_rays);
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// Ensure at least one round of shots
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for _ in 0..self.scene.shot_rays.max(1) {
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pb.reset(); // We're rendering the whole film again, reset the pixel counter
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for y in 0..self.scene.camera.film().height() {
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for x in 0..self.scene.camera.film().width() {
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let i = x + y * self.scene.camera.film().width();
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buffer[i as usize] += self.pixel_ray(x as f32, y as f32);
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pb.inc(1);
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}
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}
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pa.inc(1); // Increment the number of passes
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}
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pa.finish();
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pb.finish_and_clear();
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buffer_to_image(buffer, self.scene.shot_rays, width, height)
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}
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fn pixel_ray(&self, x: f32, y: f32) -> LinearColor {
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let (x, y) = self.scene.camera.film().pixel_ratio(x, y);
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let ray = self.scene.camera.ray_with_ratio(x, y);
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if let Some(_) = self.cast_ray(ray) {
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LinearColor::new(1., 1., 1.) // FIXME: calculate real color
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} else {
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LinearColor::black()
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}
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}
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fn cast_ray(&self, ray: Ray) -> Option<(f32, &Object)> {
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self.scene.bvh.walk(&ray, &self.scene.objects)
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}
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}
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@ -2,9 +2,18 @@ use indicatif::ProgressBar;
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pub fn get_progressbar(total: u64) -> ProgressBar {
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let pb = ProgressBar::new(total);
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pb.set_draw_delta(total / 10000);
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pb.set_draw_delta((total / 10000).max(1));
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pb.set_style(indicatif::ProgressStyle::default_bar().template(
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"{spinner:.green} [{elapsed_precise}] [{wide_bar:.cyan/blue}] {percent:>3}%: {pos}/{len} pixels (ETA: {eta})",
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));
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pb
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}
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pub fn get_multiple_progress(total: u32, passes: u32) -> (ProgressBar, ProgressBar) {
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let pb = ProgressBar::new(passes as u64);
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pb.set_draw_delta((passes as u64 / 100).max(1));
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pb.set_style(indicatif::ProgressStyle::default_bar().template(
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"{spinner:.green} [{elapsed_precise}] [{wide_bar:.cyan/blue}] {percent:>3}%: {pos}/{len} passes (ETA: {eta})",
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));
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(pb, get_progressbar(total as u64))
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}
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@ -1,4 +1,6 @@
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use crate::core::LinearColor;
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use crate::Vector;
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use image::RgbImage;
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use nalgebra::Unit;
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use rand::prelude::thread_rng;
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use rand::Rng;
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@ -103,6 +105,25 @@ pub fn sample_hemisphere(normal: Vector) -> (Vector, f32) {
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(scattered, 1. / scattered.dot(&normal))
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}
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pub fn prepare_buffer(total: u32) -> Vec<LinearColor> {
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let mut ans = Vec::with_capacity(total as usize);
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for _ in 0..total {
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ans.push(LinearColor::black());
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}
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ans
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}
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pub fn buffer_to_image(buffer: Vec<LinearColor>, passes: u32, width: u32, height: u32) -> RgbImage {
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let mut image = RgbImage::new(width, height);
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for (x, y, pixel) in image.enumerate_pixels_mut() {
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let i = x as usize + y as usize * width as usize;
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*pixel = (buffer[i].clone() / passes as f32).into();
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}
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image
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}
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#[cfg(test)]
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mod test {
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use super::*;
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