title: Unable to export a tree in json for three.js
body: <p>I made a tree with the sapling addon almost like <a href="https://blender.stackexchange.com/a/8689">here</a>. Then I exported it to json by means of addition from three.js, afterwards to display in WebGL. But only the foliage of a tree is for some reason displayed, and the tree trunk and branches are absent.<br>
  I looked at json the file, there are no records about a trunk. Though the tree represents combining of leaves and a trunk.<br>
  What are the proposals?</p>