title: How to add a MTL texture to an OBJ in three.js
body: <p>Hello so I am trying to figure out how to add an MTL file to my OBJ in three.js. I had my OBJ loaded and was coming back to fix this issue. Now when I added the code for the MTL file to be loaded using <code>MTLLoader</code> it is not getting passed <code>mtlLoader.load(url, ....)</code> (as in after adding this bit of code now only the scene is being rendered with nothing inside of it). I am using alerts to track the progress of the code and am getting alerts from before this statement but not after. All of the solutions I have found include using <code>OBJMTLLoader</code> which is no longer part of the current version of three.js (r74).</p>