From 58a783b01e1f0154a2047c53ef935d04b951e43f Mon Sep 17 00:00:00 2001
From: Nathan Vegdahl <cessen@cessen.com>
Date: Sun, 30 Jul 2017 23:14:03 -0700
Subject: [PATCH] Silly mistake in calculating interpolated triangle normal.

The normal is in the local space of the model and needs to be
transformed to global space for lighting calculations.
---
 src/surface/triangle_mesh.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/surface/triangle_mesh.rs b/src/surface/triangle_mesh.rs
index ab21470..6a29a28 100644
--- a/src/surface/triangle_mesh.rs
+++ b/src/surface/triangle_mesh.rs
@@ -225,7 +225,7 @@ impl<'a> Surface for TriangleMesh<'a> {
                                     let n1 = lerp_slice(n1_slice, wr.time).normalized();
                                     let n2 = lerp_slice(n2_slice, wr.time).normalized();
 
-                                    let s_nor = (n0 * b0) + (n1 * b1) + (n2 * b2);
+                                    let s_nor = ((n0 * b0) + (n1 * b1) + (n2 * b2)) * mat_space;
                                     if dot(s_nor, geo_normal) >= 0.0 {
                                         s_nor
                                     } else {