fx: sphere hit calculation sometimes picking wrong isct point

2026-04-20 19:59:22 +02:00
parent 66c6bf438b
commit 6bf65eb60c
3 changed files with 5 additions and 3 deletions
--- a/src/objects/sphere.rs
+++ b/src/objects/sphere.rs
@@ -42,7 +42,9 @@ impl Hittable for Sphere {
        if d < 0. {
            None
        } else {
-            let t = (h - sqrt(d)) / a;
+            let tl = (h - sqrt(d)) / a;
+            let tr = (h + sqrt(d)) / a;
+            let t = if tl > 0.001 { tl } else { tr };
            let p = r.at(t);
            let out_n = (p - self.center) / self.radius;
            Some(Hit::new(