From 18024d43b9d79818d8b124b85264582195af2794 Mon Sep 17 00:00:00 2001
From: Nathan Vegdahl <cessen@cessen.com>
Date: Wed, 25 Oct 2017 06:59:35 -0700
Subject: [PATCH] Stupid bug in SphereLight ray intersection code.

The ray origin wasn't transformed into local space, resulting in
silly problems.
---
 src/light/sphere_light.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/light/sphere_light.rs b/src/light/sphere_light.rs
index afeea9a..4a2334e 100644
--- a/src/light/sphere_light.rs
+++ b/src/light/sphere_light.rs
@@ -227,7 +227,7 @@ impl<'a> Surface for SphereLight<'a> {
             let radius = lerp_slice(self.radii, r.time); // Radius of the sphere
 
             // Get the ray origin and direction in local space
-            let orig = r.orig.into_vector();
+            let orig = (r.orig * xform).into_vector();
             let dir = wr.dir * xform;
 
             // Code adapted to Rust from https://github.com/Tecla/Rayito