From d91346f605b5f2a8a9a036acd37c00bc7ca471b7 Mon Sep 17 00:00:00 2001
From: numzero <numzer0@yandex.ru>
Date: Mon, 30 Dec 2024 19:32:38 +0300
Subject: [PATCH] Track a specific sphere

---
 src/bin/minitracer/main.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/bin/minitracer/main.rs b/src/bin/minitracer/main.rs
index bf2e06b..c50571c 100644
--- a/src/bin/minitracer/main.rs
+++ b/src/bin/minitracer/main.rs
@@ -143,9 +143,10 @@ fn main() {
 						for _ in 0..RAYS_PER_PIXEL {
 							frame += 1;
 							let time = frame as f32 / (60. * RAYS_PER_PIXEL as f32);
+							let target = sphere_params[0].to_sphere(time - 0.2).center;
 							let eye = camera_params.to_sphere(time).center;
 							let right = camera_params.deriv(time);
-							let forward = target_params.to_sphere(time).center - eye;
+							let forward = target - eye;
 							let viewport = make_viewport(size.width, size.height);
 							let location = convert_location(CamLoc { eye, forward, right });
 							let spheres: Vec<_> = sphere_params.iter().map(|p| p.to_sphere(time)).collect();
@@ -163,7 +164,7 @@ fn main() {
 								viewport,
 								trace::Aperture {
 									radius: 0.001,
-									focal_distance: std::f32::INFINITY,
+									focal_distance: forward.length(),
 								},
 								location,
 							);