From a272561c6ec0f3b2944f6d467a70982d890be9e5 Mon Sep 17 00:00:00 2001
From: JannisX11 <jannis4236@gmail.com>
Date: Mon, 28 Jun 2021 22:51:49 +0200
Subject: [PATCH] Fix #941 glTF does not export materials

---
 lib/GLTFExporter.js | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/lib/GLTFExporter.js b/lib/GLTFExporter.js
index fe85ab77..bbbc4e34 100644
--- a/lib/GLTFExporter.js
+++ b/lib/GLTFExporter.js
@@ -165,6 +165,8 @@ GLTFExporter.prototype = {
 		var uids = new Map();
 		var uid = 0;
 
+		var cachedMaterials = {};
+
 		/**
 		 * Assign and return a temporal unique id for an object
 		 * especially which doesn't have .uuid
@@ -919,6 +921,22 @@ GLTFExporter.prototype = {
 
 		}
 
+		function getLamberMaterial(original) {
+			if (cachedMaterials[original.uuid]) {
+				return cachedMaterials[original.uuid];
+			} else {
+				let material = new THREE.MeshLambertMaterial({
+					color: 0xffffff,
+					map: original.map,
+					transparent: true,
+					side: Canvas.getRenderSide(),
+					alphaTest: 0.05
+				});
+				cachedMaterials[original.uuid] = material;
+				return material;
+			}
+		}
+
 		/**
 		 * Process material
 		 * @param  {THREE.Material} material Material to process
@@ -945,8 +963,7 @@ GLTFExporter.prototype = {
 
 			if ( material.isShaderMaterial && ! material.isGLTFSpecularGlossinessMaterial ) {
 
-				console.warn( 'GLTFExporter: THREE.ShaderMaterial not supported.' );
-				return null;
+				material = getLamberMaterial(material);
 
 			}