From de06cab138788405aeeaff8d3da80a90d0be96ae Mon Sep 17 00:00:00 2001
From: "Mr.doob" <info@mrdoob.com>
Date: Mon, 11 Feb 2019 17:19:59 -0800
Subject: [PATCH] GLTFLoader: Use RGBFormat for `aoMap`, `roughnessMap` and
 `metalnessMap` textures.

---
 examples/js/loaders/GLTFLoader.js | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/examples/js/loaders/GLTFLoader.js b/examples/js/loaders/GLTFLoader.js
index 295889d0d0..1d92281f55 100644
--- a/examples/js/loaders/GLTFLoader.js
+++ b/examples/js/loaders/GLTFLoader.js
@@ -2232,6 +2232,16 @@ THREE.GLTFLoader = ( function () {
 
 		return this.getDependency( 'texture', mapDef.index ).then( function ( texture ) {
 
+			switch ( mapName ) {
+
+				case 'aoMap':
+				case 'roughnessMap':
+				case 'metalnessMap':
+					texture.format = THREE.RGBFormat;
+					break;
+
+			}
+
 			if ( parser.extensions[ EXTENSIONS.KHR_TEXTURE_TRANSFORM ] ) {
 
 				var transform = mapDef.extensions !== undefined ? mapDef.extensions[ EXTENSIONS.KHR_TEXTURE_TRANSFORM ] : undefined;
-- 
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