rm for ... in

gltf.cm

@@ -294,13 +294,13 @@ function used_image_indices(asset) {
   var used_tex = used_texture_indices(asset)
   var textures = asset.textures || []
 
-  for (var k in used_tex) {
+  arrfor(array(used_tex), function(k) {
     var ti = number(k)
     var t = textures[ti]
     if (!t) continue
     if (t.image == null) continue
     used_imgs[t.image] = true
-  }
+  })
 
   return used_imgs
 }