title: How to set image on Texture in Unity 3d
body: <p>I am new to Unity 3D and I want to do just little task: to set image on a <code>Texture</code> instance in Unity 3D. I don't know how to do this at runtime, and I also would like to know how I set its transparency low.</p>
  
  <p>I don't need Texture2D - I just need Texture. My image is in <code>.png</code> format. I also want set an image from my documents directory on to this texture. </p>