From 39759360bf90488326a580659662b45d98fd56cc Mon Sep 17 00:00:00 2001
From: Takahiro <hogehoge@gachapin.jp>
Date: Mon, 12 Mar 2018 23:11:33 +0900
Subject: [PATCH] GLTFExporter: Add geometry.index === null check for createing
 index

---
 examples/js/exporters/GLTFExporter.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/examples/js/exporters/GLTFExporter.js b/examples/js/exporters/GLTFExporter.js
index c19474fc94..c4cb3b2e5f 100644
--- a/examples/js/exporters/GLTFExporter.js
+++ b/examples/js/exporters/GLTFExporter.js
@@ -1007,10 +1007,10 @@ THREE.GLTFExporter.prototype = {
 			var forceIndices = options.forceIndices;
 			var isMultiMaterial = Array.isArray( mesh.material );
 
-			if ( ! forceIndices && isMultiMaterial ) {
+			if ( ! forceIndices && geometry.index === null && isMultiMaterial ) {
 
 				// temporal workaround.
-				console.warn( 'THREE.GLTFExporter: Force index for a mesh with multi-material.', mesh );
+				console.warn( 'THREE.GLTFExporter: Creating index for non-indexed multi-material mesh.' );
 				forceIndices = true;
 
 			}
-- 
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