title: 3D object render using .obj file in iOS and add dynamic texture at touched position
body: <p>I have good hands on objective-C but not on OpenGl, Please help me with the problem below,</p>
  
  <p>I have a human skeleton body as .obj file. I am able to render it on View.</p>
  
  <p>But I am facing following problems</p>
  
  <ol>
  <li>Rotation about x,y axis.</li>
  <li>Moving 3D model relatively to any point.  </li>
  <li>I am not able to detect body part touch event. e.g When I long press on left hand then app should detect as user click on left hand.</li>
  <li>Add marker (Any texture) at runtime on body part where user touched.</li>
  </ol>
  
  <p>Thanks in advance.</p>