Add GLTFLoader LineMaterial support

examples/js/loaders/GLTFLoader.js

@@ -2106,17 +2106,40 @@ THREE.GLTFLoader = ( function () {
 
 						}
 
-					} else if ( primitive.mode === WEBGL_CONSTANTS.LINES ) {
+					} else if ( primitive.mode === WEBGL_CONSTANTS.LINES ||
+						primitive.mode === WEBGL_CONSTANTS.LINE_STRIP ||
+						primitive.mode === WEBGL_CONSTANTS.LINE_LOOP ) {
 
-						mesh = new THREE.LineSegments( geometry, material );
+						var cacheKey = 'LineBasicMaterial:' + material.uuid;
 
-					} else if ( primitive.mode === WEBGL_CONSTANTS.LINE_STRIP ) {
+						var lineMaterial = scope.cache.get( cacheKey );
 
-						mesh = new THREE.Line( geometry, material );
+						if ( ! lineMaterial ) {
 
-					} else if ( primitive.mode === WEBGL_CONSTANTS.LINE_LOOP ) {
+							lineMaterial = new THREE.LineBasicMaterial();
+							THREE.Material.prototype.copy.call( lineMaterial, material );
+							lineMaterial.color.copy( material.color );
+							lineMaterial.lights = false;  // LineBasicMaterial doesn't support lights yet
 
-						mesh = new THREE.LineLoop( geometry, material );
+							scope.cache.add( cacheKey, lineMaterial );
+
+						}
+
+						material = lineMaterial;
+
+						if ( primitive.mode === WEBGL_CONSTANTS.LINES ) {
+
+							mesh = new THREE.LineSegments( geometry, material );
+
+						} else if ( primitive.mode === WEBGL_CONSTANTS.LINE_STRIP ) {
+
+							mesh = new THREE.Line( geometry, material );
+
+						} else {
+
+							mesh = new THREE.LineLoop( geometry, material );
+
+						}
 
 					} else if ( primitive.mode === WEBGL_CONSTANTS.POINTS ) {