rtiow: fix bug in calculation of t in Scale hitable.

rtiow/renderer/src/scale.rs

@@ -11,21 +11,15 @@ where
     H: Hit,
 {
     hitable: H,
-    scale: Vec3,
+    scale: f32,
 }
 
 impl<H> Scale<H>
 where
     H: Hit,
 {
-    pub fn new<V>(hitable: H, scale: V) -> Scale<H>
-    where
-        V: Into<Vec3>,
-    {
-        Scale {
-            hitable,
-            scale: scale.into(),
-        }
+    pub fn new(hitable: H, scale: f32) -> Scale<H> {
+        Scale { hitable, scale }
     }
 }
 
@@ -38,6 +32,7 @@ where
         if let Some(rec) = self.hitable.hit(moved_r, t_min, t_max) {
             return Some(HitRecord {
                 p: rec.p * self.scale,
+                t: rec.t * self.scale,
                 ..rec
             });
         }