title: Three.js plane geometry border around texture
body: <p>I am building a 3D image viewer which has Three.JS plane geometries as placeholders with the images as their textures.</p>
  
  <p>Now I want to add a black border around the image. The only way I have found yet to implement this is to add a new black plane geometry behind the image to be displayed. But this required whole-sale changes to my framework which I want to avoid.</p>
  
  <p>WebGL's texture loading function gl.texImage2D has a parameter for border. But I couldn't find this exposed anywhere through Three.js and doubt that it even works the way I think it does.</p>
  
  <p>Is there an easier way to add borders around textures?</p>