Always have writtenResourceMap be defined

lib/writeResources.js

@@ -52,7 +52,7 @@ function writeResources(gltf, options) {
     ForEach.image(gltf, function(image, i) {
         writeImage(gltf, image, i, writtenResourceMap, options);
         ForEach.compressedImage(image, function(compressedImage) {
-            writeImage(gltf, compressedImage, i, options);
+            writeImage(gltf, compressedImage, i, writtenResourceMap, options);
         });
     });
 
@@ -61,20 +61,20 @@ function writeResources(gltf, options) {
     });
 
     // Buffers need to be written last because images and shaders may write to new buffers
-    removeUnusedElements(gltf, ['acessor', 'bufferView', 'buffer']);
+    removeUnusedElements(gltf, ['accessor', 'bufferView', 'buffer']);
     mergeBuffers(gltf, options.name);
 
     ForEach.buffer(gltf, function(buffer, bufferId) {
-        writeBuffer(gltf, buffer, bufferId, options);
+        writeBuffer(gltf, buffer, bufferId, writtenResourceMap, options);
     });
     return gltf;
 }
 
-function writeBuffer(gltf, buffer, i, options) {
+function writeBuffer(gltf, buffer, i, writtenResourceMap, options) {
     if (defined(options.bufferStorage) && !options.separateBuffers) {
         writeBufferStorage(buffer, options);
     } else {
-        writeResource(gltf, buffer, i, options.separateBuffers, true, '.bin', undefined, options);
+        writeResource(gltf, buffer, i, options.separateBuffers, true, '.bin', writtenResourceMap, options);
     }
 }