From 6bdffedcbeb013ecad8cfe1a5ec2390c2467b86a Mon Sep 17 00:00:00 2001
From: Evan Birenbaum <birenbaum@google.com>
Date: Thu, 14 Feb 2019 13:30:57 -0800
Subject: [PATCH] Change AnimationSampler::interpolation to a non-required
 field. The spec states to default to LINEAR when not present.

---
 tiny_gltf.h | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/tiny_gltf.h b/tiny_gltf.h
index 7e7edb4..ee596e9 100644
--- a/tiny_gltf.h
+++ b/tiny_gltf.h
@@ -3263,13 +3263,8 @@ static bool ParseAnimation(Animation *animation, std::string *err,
           }
           return false;
         }
-        if (!ParseStringProperty(&sampler.interpolation, err, s,
-                                 "interpolation", true)) {
-          if (err) {
-            (*err) += "`interpolation` field is missing in animation.sampler\n";
-          }
-          return false;
-        }
+        ParseStringProperty(&sampler.interpolation, err, s, "interpolation",
+                            false);
         if (!ParseNumberProperty(&outputIndex, err, s, "output", true)) {
           if (err) {
             (*err) += "`output` field is missing in animation.sampler\n";